Facts about wood burning and corn burning outdoor furnaces.

Return to Outdoor Furnace Facts home page.
Contact Outdoor Furnace Facts for more information.
News about outdoor furnace regulation, community action, and more.
Real stories from outdoor furnace owners, dealers and neighbors.
Resources for outdoor furnace information, standards and government contacts.

Facts about wood burning and corn burning outdoor furnaces.
Information about outdoor furnaces, emissions standards, and industry terms.

Proper outdoor furnace siting, chimney height, fuel and more.

Ways to support responsible outdoor furnace use.

Information about outdoor furnaces, emissions standards, and industry terms.About Outdoor Furnaces

Wood Burning Benefits and Installation Diagrams
In recent years, wood burning outdoor furnaces, also referred to as outdoor boilers or hydronic heaters have become more popular as Americans search for renewable energy sources to heat their homes and businesses. Outdoor furnaces provide a cost-effective, safe and environmentally responsible heating option that decreases the country’s dependence on fossil fuels and foreign oil.
Outdoor furnaces are freestanding appliances that provide heat and hot water to one or more nearby buildings, swimming pools, and/or hot tubs. They heat water by burning seasoned wood or wood pellets. The hot water is then circulated to and from the home or commercial building through underground, insulated piping. Because they use water to heat homes and buildings, they are classified as hydronic heaters.
Once inside the home or business space, the heated water circulates through heat exchangers, radiant floor tubing or radiators to warm the building. Systems are compatible with existing heating systems including forced air, radiant floor, radiant baseboard or other space heating applications. Users control the indoor temperature with a thermostat.
Outdoor wood furnaces offer significant benefits over other wood-heating appliances.
  • Safety: Units are located outside, eliminating the risk of an indoor fire, and indoor smoke and carbon monoxide buildup in the home associated with burning wood indoors.
  • Affordability: Outdoor furnace owners save 50% to 100% of their heating costs depending on the cost of wood.
  • Convenience: Depending on the size of the appliance, most outdoor wood furnaces need to be loaded only once or twice a day. Outdoor wood pellet furnaces are another option that burn very clean and can sustain heat for days on a single load of wood pellets. Some owners have maintained heat up to two weeks without needing to replenish the appliance with more wood pellets. Also, by moving the furnace outdoors, users remove any ash, odor or soot buildup on walls and ceilings, typically associated with indoor burning.
  • Even Heating: Outdoor furnace heat is thermostatically controlled; therefore, it is a more even heat than wood stoves and fireplaces.
Factors that Affect Burn Time
Poorly insulated buildings, cold air infiltration, energy inefficient windows and doors, and colder outdoor temperatures can decrease an outdoor furnace’s burn time per load of wood or wood pellets. Users can conserve energy and increase an appliance’s burn time per load of fuel by well-insulating the buildings being heated, reducing cold air infiltration, and installing energy efficient windows and doors.

How to Install an Outdoor Furnace
Consult the installation diagrams below for details on how outdoor furnaces can be installed in a variety of heating applications.
Forced Air System with Water Heater
Radiant Heat
Multi-Zone In-Floor — .pdf | 177k
Multiple Buildings
Existing Boiler
Direct Plumbed — .pdf | 398k
Pressurized — .pdf | 526k
Dual Heat Systems
Baseboard / Forced Air — .pdf | 483k
 For more information, check out Outdoor Furnace Fact’s Best Burn Practices and industry Links.

site map  |  privacy policy  |  Information about Central Boiler outdoor furnaces.

Home  |  Get the Facts  |  Best Practices  |  Take Action   |  Contact Us  |  News  |  Real Users  |  Links

• Overview
• About Outdoor Furnaces
• Myths vs. Facts
• Questions & Answers
• Emissions Standards
• Emissions Reports
• Overview
• Best Burn Practices
• Overview
• Best Practice Ordinances