
OB03500
3500 WOOD STOVE WITH BLOWER
Fuel type : | Dry cordwood (16" recommended) |
Heating area : | 1,000 - 2,700 Ft2 |
Maximum heat output : | 110,000 BTU/h (32.2 kW) |
Maximum recommended heating area by climate zone Consult our map
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- Description
- Options/Accessories
- Specs/Manual
- Support/parts
- Reviews (170)
Description
Specifically designed to face the rigor of winter, the Osburn 3500 is an essential for any spacious home, especially in harsh weather conditions. Despite its emissions as 1.6 g/h, this wood stove utilizes a user-friendly, non-catalytic technology as well as a significant reduction of fuel consumption. The unit features a firebox that can hold up to 50 lb of cordwood, as well as a blower, a thermodisc and an airmate for optimal heat distribution and unparalleled comfort.
A choice of door overlay, a fire screen, a glass ash lip are available as options.
Discover the additional qualities of the Osburn 3500 wood stove
Government incentives may apply to this product.
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*Any installation must be done according to the data and drawings detailed in the owner’s manual.
98% of the last 50 product owners who have registered their warranty are satisfied with this product.
Options/Accessories
Options
Accessories
Adhesives, gaskets and insulation
Paint
Maintenance products
Meters
Fire starters
Hearth pads
Heat shields
Specs/Manual
Appliance performance (1)
Fuel type : | Dry cordwood (16" recommended) | |
Recommended heating area-ft² : () | 1,000 - 2,700 | |
Overall firebox volume-ft³ : | 3.5 | |
EPA loading volume-ft³ : | 2.88 | |
Maximum burn time : () | 10 h | |
Maximum heat output-dry cordwood : (2) | 110,000 BTU/h (32.2 kW) | |
Overall heat output rate < : (2) (3) | 17,200 BTU/h (5.0 kW) to 57,800 BTU/h (16.9 kW) | |
Average overall efficiency (dry cordwood) : (3) | 71 % (HHV) (4) | 76 % (LHV) (5) |
Optimum overall efficiency : (6) (7) | 77 % | |
Optimum heat transfer efficiency : (8) | 75 % | |
Average particulate emissions rate : (9) | 1.6 g/h | |
Average CO : (10) | 73 g/h |
(1) Values are as measured per test method, except for the recommended heating area, firebox volume, maximum burn time and maximum heat output.
() Recommended heating area and maximum burn time may vary subject to location in home, chimney draft,heat loss factors, climate, fuel type and other variables. The recommended heated area for a given appliance is defined by the manufacturer as its capacity to maintain a minimum acceptable temperature in the designated area in case of a power failure.
(2) The maximum heat output (dry cordwood) is based on a loading density varying between 15 lb/ft³ and 20 lb/ft³ and reloading intervals ranging from 60 to 120 minutes. Other performances are based on a fuel load prescribed by the standard without any reloading between start and finish. The specified loading density varies between 7 lb/ft³ and 12 lb/ft³. The moisture content is between 19% and 25%.
(3) As measured per CSA B415.1-10 stack loss method.
(4) Higher Heating Value of the fuel.
(5) Lower Heating Value of the fuel.
(6) Performances based on a fuel load prescribed by the standard at 7 lb/ft³ and with a moisture content between 19% and 25%.
(7) Optimum overall efficiency at a specific burn rate (LHV).
(8) The optimum heat transfer efficiency is for the low burn rate (using HHV) and represents the appliance’s ability to convert the energy contained in the wood logs into energy transferred to the room in the form of heat and does not take into account the chemical losses during combustion.
(9) This appliance is officially tested and certified by an independent agency.
(10) Carbon monoxyde.
General features
Combustion technology | Non-catalytic |
High-efficiency certified appliance | Yes, EPA 2020 approved |
Maximum log length | 22" |
Log positioning | Loading over width and over depth |
Chimney diameter | 6" |
Flue outlet diameter | 6" |
Type of chimney | CAN/ULC S629, UL 103 HT (2100 °F) |
Minimum chimney height (feet) | 15' |
Baffle type | C-Cast or equivalent |
Approved for an alcove installation | Yes |
Approved for a mobile home installation | Yes |
Shipping Weight | 549 lb (249 kg) |
Door type | Single, glass with cast iron frame |
Glass type | Ceramic glass |
Glass surface – dimensions (Width X Height) | 18 7/8" x 11 3/4" |
Glass air-wash system | Yes |
Premium quality blower included (CFM) | 130 |
Overall dimension (Height) | 34 3/4" |
Overall dimension (Width) | 28 7/8" |
Overall dimension (Depth) | 33 1/2" |
Door opening – dimension (Height) | 9 7/8" |
Door opening - dimension (Width) | 19" |
Firebox – dimension (Height) | 12 7/8" |
Firebox – dimension (Width) | 22 7/8" |
Firebox – dimension (Depth) | 20 1/8" |
Firebox lined with refractory bricks for better heat distribution | Yes |
Stainless-steel secondary-air system improving gas combustion | Yes |
Model | Pedestal |
Steel thickness – body | 3/16" |
Steel thickness – top | 5/16" |
USA standard (emissions) | EPA |
Canadian Standard (emissions) | CSA B415.1-10 |
USA standard (safety) | UL 1482, UL 737 |
Canadian standard (safety) | ULC S627 |
Tested and listed as per applicable standards | By an accredited laboratory (CAN/USA) |
Warranty | Limited lifetime |
Minimum clearances to combustibles*
(Data expressed in inches. 1 inch = 25.4 mm) |
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Canada | United-States | |||
Single wall pipe | Double wall pipe | Single wall pipe | Double wall pipe | |
Clearance – back wall | 13 1/4" | 6" | 13" | 6" |
Clearance - corner | 7 1/4" | 7" | 7 1/4" | 7" |
Clearance – side wall | 14" | 14" | 14" | 14" |
Clearance – top (measured from the platform on which the appliance is installed)** | 84" | 84" | 84" | 84" |
* The information given on the certification label affixed to the appliance always overrides the information published in any other media (owner's manual, catalogues, flyers, magazines and/or web sites). |
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** Some appliances have been tested with a low ceiling. Before setting up your unit, refer to the installation manual. |
Support/parts
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Do I need an EPA certified or CSAB415.1-10 certified heater?
You first have to identify what your needs are. If you are looking for ambiance, a temporary heat source in a cottage or a camp, or a simple back-up heat source in case of power failure, you do not necessarily need to invest more money in order to buy an EPA or CSAB415.1-10 certified wood heater. However, if your goal is to heat on a regular basis, the extra dollars will prove to be a good investment. Furthermore, it must be noted that certified heaters release up to 90% less particles into the atmosphere, which makes wood a renewable and clean source of heat. As a result, if the style and size of the heater you are looking for is available in a certified version, it is highly recommended that you invest in this advanced combustion technology. You will help the environment and reduce your wood consumption by up to 30%.
NOTE: If you live in the United Sates, British Columbia, Ontario, Quebec, Nova Scotia, New Brunswick or Newfoundland, EPA certified wood heaters are mandatory. Exceptions apply for certain categories of products, such as decorative fireplaces. Certain municipalities may also have by-laws that require the installation of an EPA or CSAB415.1-10 wood heater, even though the province does not have an official regulation on wood heating. It must also be noted that in Canada, the CSAB415.1-10 Standard is equivalent to the EPA Standard. A wood heater that meets this Standard will generally comply with the regulation in place.
How do I determine the size of heater I need and where should I install it?
Before answering this question, it is very important that you clearly identify what your needs are. Some people will buy a heater simply to enhance the ambiance of a room, while others will buy a heater as their main source of heat. There is no good or bad reason for buying a wood-heat system. If you simply want to enhance the ambiance of a room, most small to medium size heaters will suit your needs. Simply chose the style you like best, and put the unit in the room where you spend the most time. The heat and look of a glowing fire will create an atmosphere of warmth and coziness.
If your primary need is to heat, you must verify the heating capacity of your heater based on the technical data provided by the manufacturer. For instance, if you want to heat an 800-square-foot area on one floor, you need to buy a heater with a minimum capacity of 800 sq. ft.
If you need to heat more than one floor, keep in mind that heat rises. Therefore, a heater located in your basement will help you heat the main floor as well. However, the contrary is not true; a heater located on the main floor (ground floor) will not heat the basement. Keep in mind also that the more divisions there are in the house, the harder it will be to distribute the heat evenly.
If you need to heat two floors, calculate the surface of the lower floor. Then, add 50% of the surface of the upper floor. For instance, if you install a wood-heating system in the basement and you have 800 sq.ft., you will need a heater with a minimum capacity of 1,200 sq.ft. (800 + 400 = 1,200.
If you need to heat more than two floors, calculate the surface of the lower floor (where the wood-heating system is located). Then, add 50% of the surface of the middle floor, and 25% of the surface of the upper floor. For instance, if you install a heater in the basement and you have 800 sq.ft., you will need a heater with a minimum capacity of 1,400 sq.ft. (800+400+200= 1,400). Consult the drawing below. It will help you understand the explanations provided in this section.
REMEMBER: We are talking about "zone" heating, not central heating. The room where the heater is located and the rooms directly above it will always reach higher temperatures than the rooms distant from the unit. If you want an even temperature throughout the house, you need to consider a central heating system, such as a warm air wood furnace. Furthermore, you must keep in mind that the size of the heater you need may vary based on the insulation of your house, its exposure to wind, and the number of windows. It will always be prudent to buy a heater with a capacity that is slightly higher than the minimum capacity that you need. For instance, if you need a minimum capacity of 1,400 sq.ft., it will be more prudent to buy a heater with a capacity of 1,600 sq.ft., if not 1,800 sq.ft. There are three main advantages in buying a larger appliance: the increased heating capacity, the ease of loading more and larger logs (as a result of the greater firebox volume), and the increased combustion time (given the higher loading capacity).

The drawing above gives an example of the minimum heating capacity required for a wood-heating system installed in a house with three floors of 800 sq.ft. each. We assume that the house is well insulated and that air can circulate between each floor through an open stairway and/or floor traps.
Do I need a floor protection under and around my heater?
Yes, floor protection is required for any wood appliance unless the unit already sits on a non-combustible surface. You have many choices, such as stone, brick, cement board, or tile. You need to consult your owner's manual in order to know the dimensions of the floor protection specific to your model. In Canada, the floor protection must extend in front of the unit by at least 18 inches and by at least 8 inches on each side. In the USA, the floor protection must extend at least 8 inches on each side of the appliance (measured from the door opening) and at least 16 inches in front of the door opening.
What type of exhaust system do I need?
Your exhaust system is comprised of two main
elements: a chimney and a connector (commonly called "stove pipe").
Connectors
Connectors are simply steel pipes that connect the appliance to the insulated chimney. They are normally needed unless the appliance is already inserted into an enclosure (for instance, in the case of a zero-clearance wood fireplace). Connectors do not pass through combustible materials. The term “black pipe” is also often used in the industry. There are two types of connectors:
- Single-wall pipes
- Double-wall pipes
As their name indicates, single-wall pipes have just one wall. A minimum of 18 inches is required between the pipe and a combustible wall. In general, single-wall pipes provide less insulation than double-wall pipes do and therefore require more clearance. This is the main drawback of single-wall pipes. Their advantage is in their cost; they are nearly three times less expensive than double-wall pipes.
As their name indicates, double-wall pipes have a second wall, i.e., an interior one made of stainless steel. The cushion of air between the two walls provides thermal insulation allowing the appliance to be installed much closer to walls. This is the main advantage of double-wall pipes. The required distance for each heater model is based on the safety tests conducted with each type of connector. You therefore need to properly consult the appliance’s owner’s manual in order to know the prescribed clearances from combustible materials.
Chimney
There are two types of chimneys: an insulated (or prefabricated) chimney or a masonry chimney. If you have a masonry chimney, it must meet the local building code. It must be lined with refractory bricks or tiles joint together with refractory cement. The chimney diameter should be the same as the appliance’s flue outlet (6 inches for most models). It is rarely the case with masonry chimneys. Their diameter is often bigger than the appliance’s flue outlet. The way to deal with this is to insert inside the masonry chimney a stainless steel liner that has the same diameter as the appliance’s flue outlet. Unless a liner is installed, serious draft problems can occur.
An insulated chimney (or prefab chimney) is a stainless steel flue that has been tested to resist temperature as high as 2100F. It has a double wall filled with insulating wool. The majority of insulated chimneys have 2 inches of insulation, while some have just 1 inch. Others are air-insulated and have 3 walls; they are referred to as “triple-wall air-cooled chimneys.
When we speak of a 6-inch chimney, we are referring to its interior diameter. If the chimney has 2 inches of insulation, the flue will have an exterior diameter of 10 inches.
In wood-heat system installations, we must use an insulated chimney for any flue that passes through walls, ceilings, attics and closets (i.e., all combustible surfaces in general). This chimney must also be installed outside the house.
Why should I install a blower on my wood heater?

Why is the efficiency as per the EPA’s test data smaller than the publicized optimum efficiency?
EPA refers to the CSAB415.1-10 standard for the calculation of the appliance’s efficiency. The efficiency reported as per EPA’s directives consists of an average between four different burn rates, ranging from the lowest burn rate (air intake completely closed) to the highest burn rate (air intake completely open). The optimum efficiency that we publicize is the efficiency obtained according to the same test data, but for the low burn rate only. This efficiency is more realistic for a majority of users whose heating needs require that the unit be used to maximize burn times.
Can I vent my heater using an existing masonry chimney?
It is possible to install a heater using your existing masonry chimney. The chimney must comply with the building code of your country, state or province. It usually needs to be lined with refractory bricks, metal, or clay tiles sealed together with fire cement. The diameter of the chimney must be the same as the appliance's flue outlet. If your masonry chimney does not have the same diameter as the appliance's flue outlet, you need to insert a stainless steel liner having the proper diameter. Otherwise, you may face draft problems. There are two types of liners: rigid and flexible liner. Both types are made of stainless steel. They must be certified for venting solid-fuel burning appliances. Flexible liner is particularly useful when the masonry chimney has one or more deviations.
Can I cook on the top of my wood stove?
It is definitely possible to cook on the top of your stove. This can be very useful in case of power failure. A stove fully loaded with wood will easily reach 500 to 700 °F on top. This is sufficient to cook. The use of a pan or other cookware may scratch the paint. An option is to use a cast iron cooking grid or simply lay a piece of stainless steel on top of the stove.
Can I remove the legs or pedestal of my stove and convert it into a fireplace insert?
Unfortunately, there is a major design difference between a freestanding wood stove and a wood insert. The wood insert (like all other inserts) has an extra steel jacket that covers about 2/3 of its firebox on the sides and all of its back. This serves to accumulate the heat radiated by the firebox. The heat is then pushed in front of the unit and into the room by a blower. Without this feature, the heat radiated by the insert would be lost into the masonry cavity. Hence, a stove inserted into a masonry fireplace would not have the same efficiency. Furthermore, its clearances to combustible materials could vary. If the stove has not been tested for this type of installation, it cannot be inserted into a masonry opening.
Why is there smoke when I use my heater?
Possible causes and solutions
Your heater is new and thin smoke is coming out of the unit’s surface.
Solution: This is normal when your heater is new and has never been used. The paint needs to be "cured". You need to heat your appliance two or three of times before the curing process is completed. Simply open a window in the room where the unit is located. The amount of smoke produced by the curing process should be very limited. If the area is well ventilated, there is no health hazard.
The chimney in under negative pressure.
Solution#1: The chimney may simply be too cold. Light-up a small quantity of newspaper in the appliance, as close as possible to the flue outlet. Leave the door slightly ajar. This small fire will slowly heat-up the chimney, until it is hot enough to create a normal draft inside the exhaust system. If needed, slowly increase the quantity of newspaper. When you realize that smoke is being evacuated normally through the exhaust system, you can build a normal fire. If your chimney runs along the outside wall of your house, it is possible to cover it up in order to protect it from the wind and the cold. A covered chimney will heat-up faster.
Solution #2: Negative pressure may be caused by air-moving devices, such as a range hood, a bathroom fan, or an air exchanger. Check if smoking problems occur when those devices are working. If it is the case, make sure you turn them off when you use your heater. Otherwise, you need to make sure that the air leaving the room is replaced by air from outside the house. For instance, you can open a window slightly (by one or two inches). Ideally, the source of fresh air should be located as close as possible to the heater. A good, permanent solution is the installation of a fresh air intake. It should be located as close as possible to the unit. The appliance will draw its combustion air from this nearby supply. It will prevent the house from falling into negative pressure. Some units are designed to receive an adapter on which the fresh air supply pipe can be directly connected. This way, the appliance will always draw its combustion air from outside the house.
Solution #3: Negative pressure may be caused by wind, due to the interference from a nearby structure. In order to eliminate such interference, the extremity of your chimney should be at least two feet higher than any structure located within a ten-foot radius.
Does my heater qualify under the LEED program?
The Leadership in Energy and Environmental Design
(LEED) Green Building Rating System™ encourages and accelerates global adoption
of sustainable green building and development practices through the creation
and implementation of universally understood and accepted tools and performance
criteria. LEED is a third-party certification program and an internationally
accepted benchmark for the design, construction and operation of high
performance green buildings. It provides building owners and operators the
tools they need to have an immediate and measurable impact on their buildings’
performance.
The Canadian Green Building Council (CGBC) certifies LEED projects. The Certification is based on the total point score achieved, following an independent review and an audit of selected Credits. With four possible levels of certification (certified, silver, gold and platinum), LEED® is flexible enough to accommodate a wide range of green building strategies that best fit the constraints and goals of particular projects. The Canadian rating systems are an adaptation of the US Green Building Council's (USGBC) LEED Green Building Rating System, tailored specifically for Canadian climates, construction practices and regulations. The rating systems are adapted to the Canadian market through an inclusive process that engages stakeholders and experts representing the various sectors of the Canadian industry.
Wood or pellet stoves, fireplaces, and inserts can qualify under LEED and obtain up to one point provided that they meet the following criteria.
Why doesn't my heater produce enough heat?
Possible causes and solutions:
1- The moisture content of your wood is too high.
Solution: Make sure you use good, seasoned wood. The wood you burn plays an important role in the overall performance of your heater. Your wood should have been properly dried for about one year. Furthermore, it is better to use hardwood, such as oak, maple, beech, or ash. For the same volume, hardwood will produce more heat. Storage is also very important. Wood that has been cut for one, two or even more years, will not necessarily be dry if it has been stored in poor conditions. Under extreme conditions, it may have rotted instead of drying. Smaller pieces of wood will dry faster. The wood should be stored in a place where the grass is not too long, and where the wind will be able to circulate between the logs. A 12-inch gap should be kept between the cords. The wood should be placed in the sunniest area and should be protected from the rain and snow on top, but not on the sides. Use a moisture reader to measure the moisture content of your wood. Ideally, it should be below 25%.
2- The air control mechanism is not open enough.
Solution: Adjust the air control mechanism in order to keep the flue temperature within the comfort zone (between 250 °F and 475 °F) on your chimney thermometer. The air control mechanism must always be closed gradually. You need to obtain a good bed of red embers and the logs must be completely lit up before you close the air control completely. This can easily take up to one hour.
3- The logs that you are using are too big.
Solution: Use smaller pieces of wood and place them to allow proper air circulation between the logs. The same weight of wood cut in many small pieces will produce more heat than fewer, larger logs. Only add big logs when you have a good bed of red embers. Logs with a diameter exceeding 6 inches should always be split. Avoid stacking logs to the top of the firebox.
4- The chimney draft is too weak.
Solution #1: In many cases, a weak draft is simply due to insufficient heat in the exhaust system. Build a small, intense fire, and leave the door ajar (never leave the heater unattended). Before inserting larger logs, use dry kindling to obtain a good bed of red embers. Gradually increase the size of the logs. Close the unit’s door when you reach a flue temperature of approximately 475 °F on the chimney thermometer. Leave the air intake fully open for approximately 15 minutes. Then, gradually close the air intake control. Note that there is no danger in letting the temperature inside the flue reach approximately 700 °F during the start-up. This is even favorable in order to properly start your heater. You must, however, avoid maintaining excessive temperatures (above the comfort zone on your thermometer) during a long period of time. Your chimney thermometer should be positioned on the exhaust pipe, approximately 18 inches above the unit.
Solution #2: Your heater may not have all the oxygen it needs to allow for a sufficient draft. You first need to ensure that the room where the heater is located is sufficiently large and well ventilated. Open the nearest window by approximately 2 inches. If you notice a significant improvement, it is a sign that the unit needs more oxygen. The room may be too insulated or too small. Without an additional source of oxygen, the draft will remain weak and cause the glass stay dirty.
Solution #3: The chimney may be too short. In order to obtain a sufficient draft, your chimney must have a minimum height. Twelve feet (from the heater to the chimney cap outside the house) is a minimum. A height of 15 feet or higher is ideal.
Solution #4: Your exhaust system may be too restrictive or may lack a sufficient rise. Ideally, your exhaust system should not have more than one 90° elbow. Furthermore, all horizontal sections should be as short as possible and have a minimum slope of ¼" per foot.
Solution #5: Your exhaust system may be oversized. When your chimney is oversized, the volume of air that needs to be warmed-up is larger. It is therefore difficult to reach temperatures that will allow for a sufficient draft. Most advanced combustion systems (those certified to EPA/CSAB415.1-10) have a 6" flue outlet (152 mm). If your exhaust system does not have a 6" diameter, a solution is to insert a stainless liner with a 6" diameter inside the exhaust system.
If you have verified all the points mentioned above and your heater works fine, but still does not produce enough heat, you may be asking for more than what your appliance can realistically give you.
Stoves, fireplaces, and inserts are used for "zone heating”. It is normal that the heat is distributed unevenly inside your home. It will always be colder in the rooms that are distant from the heater. Furthermore, since heat rises, a heater located at the ground-floor level will not heat your basement.
Solution 6: It is possible to increase heat circulation between the floors by installing floor traps. The location of your heater is also important. Try to install it in a central location. If you want to heat both your basement and the ground floor, install your heater in the basement. The heat will rise to the upper floors. Verify that the area you try to heat respects your appliance’s heating capacity. Your appliance’s heating capacity can be found on the printed literature, in the owner’s manual, or in the technical data section on our web site. Keep in mind that your appliance's heating capacity assumes optimum conditions. It may be too low in situations where a house is poorly insulated, or highly exposed to wind. If you already have an appliance with a high heating capacity that works normally but does not heat enough, you probably need a central heating system, such as a warm air wood furnace.
Why does the fire go out when I close the loading door?
Possible causes and solutions:
1- The moisture content of your wood is too high.
Solution: Make sure you use good, seasoned cord wood. The wood you burn plays an important role in the overall performance of your heater. Your wood should have been properly dried for approximately one year. Storage is also key. Wood that has been cut for one, two or even more years will not necessarily be dry if it has been stored in poor conditions. Under extreme conditions, it may have rotten instead of drying. Smaller pieces of wood will dry faster. The wood should be stored in a place where the grass is not too long, and where the wind will be able to circulate between the logs. A 12-inch gap should be kept between the cords. The wood should be placed in the sunniest area and should be protected from the rain and snow on top, but not on the sides. Use a moisture reader to measure the moisture content of your wood. Ideally, it should be below 25%.
2- The air control mechanism is not open enough.
Solution: Adjust the air control mechanism in order to keep the flue temperature within the comfort zone (between 250 °F and 475 °F) on your chimney thermometer. The air control mechanism must always be closed gradually. You need to obtain a good bed of red embers and the logs must be completely lit up before you close the air control completely. This can easily take up to one hour.
3- The logs that you are using are too big.
Solution: Use smaller pieces of wood and place them to allow proper air circulation between the logs. The same weight of wood cut in many small pieces will produce more heat than fewer, larger logs. Only add big logs when you have a good bed of red embers. Logs with a diameter exceeding 6 inches should always be split. Avoid stacking logs to the top of the firebox.
4- The chimney draft is too weak.
Solution #1: In many cases, a weak draft is simply due to insufficient heat in the exhaust system. Build a small, intense fire, and leave the door ajar (never leave the heater unattended). Before inserting larger logs, use dry kindling to obtain a good bed of red embers. Gradually increase the size of the logs. Close the unit’s door when you reach a flue temperature of approximately 475 °F on the chimney thermometer. Leave the air intake fully open for approximately 15 minutes. Then, gradually close the air intake control. Note that there is no danger in letting the temperature inside the flue reach approximately 700 °F during the start-up. This is even favorable in order to properly start your heater. You must, however, avoid maintaining excessive temperatures (above the comfort zone on your thermometer) during a long period of time. Your chimney thermometer should be positioned on the exhaust pipe, approximately 18 inches above the unit.
Solution #2: Your heater may not have all the oxygen it needs to allow for a sufficient draft. You first need to ensure that the room where the heater is located is sufficiently large and well ventilated. Open the nearest window by approximately 2 inches. If you notice a significant improvement, it is a sign that the unit needs more oxygen. The room may be too insulated or too small. Without an additional source of oxygen, the draft will remain weak and cause the glass stay dirty.
Solution #3: The chimney may be too short. In order to obtain a sufficient draft, your chimney must have a minimum height. Twelve feet (from the heater to the chimney cap outside the house) is a minimum. A height of 15 feet or higher is ideal.
Solution #4: Your exhaust system may be too tortuous or may lack a sufficiently steep slope. Ideally, your exhaust system should not have more than one 90° elbow. Furthermore, all horizontal sections should be as short as possible and have a minimum slope of 1/4" per foot.
Solution #5: Your exhaust system may be oversized. When your chimney is oversized, the volume of air that needs to be warmed-up is larger. It is therefore difficult to reach temperatures that will allow for a sufficient draft. Most advanced combustion systems (those certified to EPA/CSAB415.1-10) have a 6" flue outlet (152 mm). If your exhaust system does not have a 6" diameter, a solution is to insert a stainless liner with a 6" diameter inside the exhaust system.
Why is the BTU according to EPA test data smaller than the one advertised?
You will notice a difference between the BTU output as per the EPA’s test data and what is advertised on our web site and/or product literature. The maximum BTU output we advertise is what will be obtained with a full load of seasoned cordwood inserted inside the firebox. The EPA output, on the other hand, is what has been obtained during emissions testing. The EPA test procedure requires that a special type of wood is used and positioned inside the firebox in a manner that does not represent the way the firebox volume would normally be utilized using seasoned cordwood. The EPA test load is typically much smaller. Hence, the BTU as per the EPA’s test data is reduced. The BTU output that should be considered by a normal user is the one we advertise for seasoned cordwood.
What R factor is required for my floor protection and how do I calculate it?
What burn time will I get from my wood heater?
The combustion time for an EPA or CSAB415.1-10 certified, non-catalytic wood appliance depends on many factors, the most important being the size of its firebox. Heaters with a 2.0 cubic foot firebox or more will normally have longer burn-times. From 6 to 8 hours is about the burn time you will get. Some companies will advertise longer burn times, but be careful, this calculation is made from the time you light the fire to the time there is absolutely no combustible left into the firebox. No matter what the appliance model is, the maximum BTU output will be obtained over approximately 33% of the total burn cycle. This represents 2 to 3 hours for a medium-size stove. So realistically, you will have to reload the unit every 3 or 4 hours in order to get the maximum heat out of your appliance when you are home. If you don’t reload the heater and let it burn the remaining fuel, your output will slowly decrease until there is no useful heat left to produce (we call this the “tail end” of the combustion cycle). This “tail end” will provide heat for another 4 to 5 hours. So if you are looking for a 6 to 8-hour burn time, make sure you choose an EPA or CSAB415.1-10 certified wood heater with a BTU output (using cordwood) of 60,000 BTU or more. Appliances with that kind of output all have fairly large fireboxes. If you are going to rely mostly on wood for heating and your house has more than 2,000 square feet, do not hesitate to choose one of our larger units (>85,000 BTU). Those appliances will have a burn time of approximately 8 to 10 hours.
Can I install an EPA or CSAB415.1-10 certified heater on an 8-inch chimney?
EPA or CSAB415.1-10 certified heaters function best on a 6-inch chimney (interior diameter). The problem with an 8-inch chimney is that the appliance may struggle to heat-up the air volume contained inside the chimney. A hot chimney is required to create enough draft. Poor draft will inevitably lead to poor combustion, which will cause smoke roll backs, a dirty glass, lack of heat, and a large quantity of unburned fuel inside the firebox. It is therefore highly recommended installing a 6-inch liner inside the 8-inch chimney. This liner may be rigid or flexible.
What makes a heater mobile-home approved?
Mobile-home approved stoves have gone through specific testing to show that they can source their combustion air entirely from outside the house. This is required because mobile homes (or manufactured homes) are often very airtight. Should there be a lack of combustion air, harmful levels of CO (carbon monoxide) could accumulate in the house. This is why mobile-home approved stoves have an adapter that hooks-up to the unit and connects to a fresh air intake on the outside wall of the house through an insulated pipe.
Do I need to install a fresh air intake on my wood heater?
A fresh air intake is not mandatory for your wood heater, unless the unit is installed in a mobile home or if the local building code or the manufacturer requires it. If the heater is installed in an open room, in a house that is more or less air-tight, combustion air will normally be easily replaced. In this case, the installation of a fresh air intake is not required. It must, however, be noted that a fresh air intake, even if it is not mandatory, will always provide the advantage of better balancing the house with regards to combustion air. If the house has a powerful mechanical exhaust system that may be used while the heater is burning (ex: range hood), a fresh-air intake will be required.
Reviews
Warren Jones
- 2025-01-07
2nd purchase of an Osburn product. Quality is first class. Product works very well for heating the house. We never used the gas heater at all for the last few years other than to knock the chill off until I got the fireplace going. Great product!!!
Jason Hackett
- 2024-12-30
Richard Woll
- 2024-12-21
Eric Routh
- 2024-12-15
Dave Stewart
- 2024-12-12
Chris Kisser
- 2024-12-09
Joseph Dupuis
- 2024-12-02
The stove burns fine if we leave the door slightly ajar but when the door is closed completely it tends to choke out the fire.
Ruth Ryckman
- 2024-12-02
Michel & Donna Regimbald
- 2024-11-26
Francis Branagan
- 2024-11-22
Francis Branagan
- 2024-11-22
Brett Welsh
- 2024-11-16
James Ball
- 2024-11-11
Robert Haver
- 2024-11-03
Keeps my 1770's stone farmhouse toasty in the Winter. Great Stove!
Tara Deuville
- 2024-11-02
Pierre Claveau
- 2024-10-25
Theodore Samotis
- 2024-10-17
Valerie Kelly
- 2024-10-16
This is a great stove. The fan blower really moves the warm air. Love it.
Jaimie Ally
- 2024-10-15
Johnathan Sanford
- 2024-10-07
Marge Curtis
- 2024-09-29
Beautiful stove. Fit in perfectly where original stove was. Looking forward to using it.
John Millburn
- 2024-09-17
Chuck Cook
- 2024-09-16
Wayne PARE
- 2024-09-07
Alexandre Leclerc
- 2024-08-30
Sandusky County Park District
- 2024-07-30
Bruce Packard
- 2024-07-10
Dan Priebe
- 2024-07-04
Bruce Packard
- 2024-06-28
I am very happy with it.
Larry Frey
- 2024-06-24
I have been burning wood for over 32 years and this is the most efficient wood stove I ever purchased.
Zac Syme
- 2024-04-05
Bryan Shakley
- 2024-03-17
Wayne Richey
- 2024-02-29
Mandy Campbell
- 2024-02-28
Linda Engelmann
- 2024-02-09
Damon Ward
- 2024-01-28
Jason Delaurelle,
- 2024-01-25
David Upmalis
- 2024-01-19
Jason Moore
- 2024-01-15
Carl Johnson
- 2024-01-14
Purchased in October of 2022. Installed in home in September of 2023. Home completed in November 2023
Jamie Brooks
- 2024-01-14
John Overton
- 2024-01-09
Emily Hanstra
- 2023-12-22
The stove is very hardy and will meet our heating needs well. The installation instructions were easy to understand and follow. I have not had a chance to use the stove yet, but am looking forward to firing it up. We have had a few installation hiccups that have been cosmetic: the ash drawer handle is missing and the door overlay bolts were not welded on in the correct location to facilitate seamless mounting. Overall, quality seems to be good and customer service has been communicative as we work through the issues.
Linda Harris
- 2023-12-20
Matthew Wells
- 2023-12-16
This stove has worked exceptionally well for the last 2 winters. The blower is starting to not work as well, and I’d like to clean it. In reading the manual there isn’t a clear explanation on how to remove the blower, and I don’t want to break it. Does anyone have suggestions on how to remove and reinstall the blower, so I can get it cleaned?
Joshua Olson
- 2023-12-14
Lee Knigge
- 2023-12-07
Carol Hall
- 2023-12-04
Tom and Tammy Richardson
- 2023-11-22
Love the look. Still have not used---will probably start next week. So I don't know the function yet (but I got my neighbor to buy one also and he has, and he loves his..)
John Modica
- 2023-11-15
Evan Hansen
- 2023-11-04
Wilson Sawyer
- 2023-11-02
First night the glass got very sooted and can’t get clean
Stephen Cesare
- 2023-11-01
Richard Zavodny
- 2023-10-29
Very nice quality wood stove for a reasonable cost. Burning very well with long burn times for the little bit of wood that we used so far this year. It looks like a good decision selecting this stove for our replacement for the old one.
Don Warden
- 2023-10-29
Doesn't put out enough heat, close down the air intake and it will go out and have to leave door cracked open for it to burn
Sheila Calhoun
- 2023-10-27
Jackie Kookesh
- 2023-10-23
Brian Gallagher
- 2023-10-19
A couple little issues. Unit was shipped to my house directly. All bricks in place however a few of them were broken and one is cracked will probably break soon. Part number 51, insulation board on top of stove was hanging from the moment it was unpacked, got around to checking it out the 4 tabs that hold it in place are holding chunks of it and the board itself will not stay secured for sure need a new one. The paint on the face of the stove looks great from a few feet back however there is a corner of the face that looks like it was sprayed over rust. I don’t mind it I just really hope it doesn’t become a problem and flake off in the future. I had a osburn 1700 here I bought last year and loved it very excited to get this 3500 up and running just need a few parts beforehand
Larry Sly
- 2023-10-18
Kimberly Warman - Linton
- 2023-10-17
We absolutely love Osburn wood stove products. We recently upgraded to the 3500 model...so we can't wait to use our new stove.
Julia Ferguson
- 2023-10-01
Lynette Marr
- 2023-09-29
Tod Schultz
- 2023-09-19
Barton Blomquist
- 2023-08-27
Last year I installed a model 3500 insert in the main living room fireplace. I’m so pleased with how well it heated and functions that I purchased another one for the basement fireplace that I’m installing this fall. Great stove!!!
Michael Glenn
- 2023-08-18
TOO HOT YET TO USE THE UNIT, BUT, IT IS VERY WELL BUILT.
Sarah Becker
- 2023-08-17
It’s good
Kim Bock
- 2023-08-16
Haven't used it yet, but excited to do so. Looks amazing, meticulous installation.
Paul Aquilina
- 2023-08-13
Love our Osburn
Erik Sifuentes
- 2023-08-02
Purchased over 8 years ago an Osburn Matrix insert for our primary residence. We loved that stove, it heated the entire home and looked amazing. The stove was of highest quality. Now in a new residence, I just purchased a freestanding Osburn 3500 to replace an old Timberline woodstove. The 3500 is massive, of competing size to the Timberline. I am excited for winter to see how well this does. The timberline heated this place with a tremendous amount of heat, but it was also inefficient and dangerous. The 3500 is beautiful just like the matrix, high quality, and the firebox is huge. I am sure it will heat this place this winter just fine.
John Heide
- 2023-07-30
Stephen Manford
- 2023-07-16
Haven’t used it yet.
Terry Taylor
- 2023-07-10
Gerald Martin
- 2023-06-30
Edward Mitchell jr.
- 2023-06-13
i like the look of the stove but haven't used it yet hopefully it will work as good as it looks.
Judith Deblois
- 2023-05-25
Wayne Kean
- 2023-04-29
Kimberly Harper
- 2023-04-28
Arthur Rodriguez
- 2023-04-15
Style of stove and size perfect for my home.
Philip Lyvers
- 2023-04-14
Jérome Lacroix
- 2023-04-05
John Olk
- 2023-03-28
Jack Schell
- 2023-03-26
Lauren Grossman
- 2023-03-09
Brandon Luna
- 2023-02-13
Robert Brown
- 2023-02-04
John Keefer
- 2023-02-02
Warren Jones
- 2023-01-27
2nd purchase of an Osburn unit (1st unit would not fit into new house brick chimney). The quality and heat output from the large unit was unbelievable, never turned on the heater for the last 3 winters, the Osburn did the job)
Don Dessert
- 2023-01-12
Carolyn Hoxsie
- 2022-12-29
Kevin Rocheleau
- 2022-12-24
Nicholas Harris
- 2022-12-23
Julie Coplan
- 2022-12-17
The wood burning stove is well made and we love the warmth. Jack for Osborn assisted us in getting the right stove and was super helpful.
Allyson Morissette
- 2022-12-15
Scot Osborne
- 2022-12-11
Wish I had the option to purchase the stove door opening from the other direction. The firebricks are not the same thickness (uneven), so cleaning out the ash means popping up the bricks with the scrapper. The firebox needs to be deeper to not require the metal brackets placed under the bricks to prevent a log from rolling against the window. You risk burning yourself, you bump them and pop up the bricks, and most importantly, does not correctly protect the window as if the box was 2” deeper or the window 2” narrower from the bottom. Take the decorative panels off the side, it inhibits radiating the heat - the whole purpose of the stove. Since the stove is in the basement, I removed the ash pan cover - nice feature for within the living area. Love the large & deep ash pan. Stove is very nice, and still in the early stages of my review.
Douglas Rogers
- 2022-12-01
Kurt Sorensen
- 2022-11-28
terry trueman
- 2022-11-25
Easy to install. Works well. Produces abundant heat. The fan really pushes out the heat. We are going to order the screen as that will push out more heat. Easily heats our 2600 sq ft on two floors. The firebox is large and accommodates a lot of wood.
Mark Messmann
- 2022-11-18
Michael Hodack
- 2022-11-18
Ghislain Côté
- 2022-11-17
Très satisfait de notre nouveau poêle, facile d'utilisation, la clé de contrôle d'air est efficace, sa capacité de chauffage excellente, son ventilateur thermoactivé très pratique. A+
Phillip Franz
- 2022-11-16
DANIEL DUMAS
- 2022-11-14
Caleb Stack
- 2022-11-13
Love the Osburn 3500! We were using oil heat to heat our 120 year old home and bought this to save money on the increasing oil prices. This adds a very nice aesthetic to our living room and heats our house saving a lot of money during the winter!
Brian Harris
- 2022-11-12
Brittany Orcutt
- 2022-11-11
Angela Mitchell
- 2022-10-25
Jill Nelsen
- 2022-10-23
Wow where do I start. It is the most efficient stove I have ever owned. Put two logs in and 3 hours later still burning. Stoked it the next morning at 6am and still had hot coals at 4pm that afternoon. Heated the entire house which is around 4000 sq feet. Would recommend to anyone interested in an efficient and effective wood stove
Myke Laforge
- 2022-10-19
John Foster
- 2022-10-15
Charles Haasch
- 2022-10-13
JASON BAYLEY
- 2022-10-02
Peter Rizzi
- 2022-09-30
Robert Collison
- 2022-09-26
Just installing. Not used yet but like the way it is built.
Ronald Abts
- 2022-09-24
Nathalie Paradis
- 2022-09-11
Dennis Padilla
- 2022-06-11
Blows out lots of hot air
Robert Miller
- 2022-05-27
Thomas J Stauffer
- 2022-04-09
Our installer was very helpful/courteous and answered any/all questions
robert Funk
- 2022-03-19
Jonathan Fay
- 2022-03-05
Roger and Janet Brafford
- 2022-02-14
Mike Sharp
- 2022-02-05
Jan Ekdom
- 2022-01-25
Salut Beau poêle , très performant ! Merci
Susan & Steve Gannon
- 2022-01-16
Barbara Black
- 2022-01-12
FRANCOIS GAGNÉ
- 2022-01-06
Joseph Gambino
- 2021-12-31
JESSICA QUIRION
- 2021-11-18
Jonathan O'Connor
- 2021-11-17
RAOUL BOLDUC
- 2021-11-02
PIER-ALAIN GUAY
- 2021-11-02
Richard Laliberté
- 2021-10-30
NaTalia Eggebrecht
- 2021-10-23
we are not into the cold winter months yet but I do like that we are only burning about half the amount of wood our old wood stove would burn in one night. Having the thermostat for the blower is a grate feature. The blower does a good job of pushing the hot air. Once the fire is hot there's no smoke and burns clean.
Michelle Webb
- 2021-10-18
Kevin Winters
- 2021-10-11
It is not installed at this time and the only problem right now is locating the certification plate on the stove, as there is none anywhere - even on the bottom - which if it was there that is the worst place to put it. I found a serial number on the blower and I hope that is the one needed to register - otherwise, somebody didn't do their job at the stove manufacturing plant.
MICHAEL GILCHRIST
- 2021-10-01
Alexandra Barlow
- 2021-09-15
So far, so good. Beautiful big stove. The blower can be a little loud.
Jonathan O'Connor
- 2021-09-03
Jonathan O'Connor
- 2021-09-03
VICKIE POULIN
- 2021-09-01
Thomas McCoppin
- 2021-08-11
James Thompson
- 2021-07-30
John Zeiter
- 2021-06-22
Patrick Cavalier
- 2021-05-25
Nora Keith
- 2021-05-23
Pierre Delay
- 2021-05-07
Marcel Vermette
- 2021-04-30
andrew mackenzie
- 2021-04-23
excellent view of flame & takes 22"logs long lasting compared to the old Fisher stove of 45 yrs
FRATERNITÉ Jean-Marie Vianney
- 2021-04-13
France Beaulieu
- 2021-03-20
Craig Groshek
- 2021-03-06
Great burning time! Love the warmth
Tyler Lounsberry
- 2021-03-06
Daniel McCullough
- 2021-02-22
Ronald Duke
- 2021-01-12
Corporation de Développement Trinitas Lucien Prud’Homme
- 2021-01-02
Guy Coutu
- 2020-12-28
C est un très bon produit que je recommande fortement ce produit.
Eric Paquet
- 2020-12-14
Samira Khera
- 2020-12-03
Samira Khera
- 2020-12-03
Éric Roy
- 2020-11-23
D’une très grande qualité! Jusqu’à présent, très facile d’utilisation!!
steve henrisson
- 2020-11-10
great design and performance!
Tom and Lee Ann Rogers
- 2020-11-06
STEVE HENRISSON
- 2020-11-02
I love the design, with the see through window; very easy to install, instructions very clear; the quality and most of all the efficiency of this unit, very performing . I am very satisfied and I will recommend it to everybody for sure.
DonnaMae Keys
- 2020-10-23
Todd Roberts
- 2020-10-14
Victor Erickson
- 2020-10-13
Marcel Gauthier
- 2020-10-06
Robert Richardson
- 2020-09-19
Maxime Dionne
- 2020-09-18
Mike Morrison
- 2020-01-23
I didn't know wood stoves could work so well. All my past stoves couldn't hold coals until morning. This stove is above and beyond my expectations. I should have done this long ago. The variable speed fan is awesome.