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EPA Burn Wise Program
<br />Hydronic heater basics
<br />Hydronic heaters, or outdoor wood boilers, are typically located outside in small
<br />sheds with short smokestacks. They burn wood, which heats either water or water -
<br />antifreeze, which sends the heat and hot water through pipes into nearby buildings,
<br />such as homes, barns and greenhouses. However, hydronic heaters may be located
<br />indoors and may use other biomass for fuel, such as corn or wood pellets.
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<br />Source: Hearth, Patio and Barbecue Association (HPBA)
<br />Although most units are designed to burn dry, seasoned wood, some people use them
<br />to burn green wood, which generates much more smoke and is less efficient. Other
<br />people burn household trash or treated wood, which not only release harmful
<br />chemicals and pollution, but is against federal law.
<br />Unqualified or uncertified hydronic heaters can be substantially dirtier and less
<br />efficient than most other home heating technologies. With their smoldering fires and
<br />short smokestacks (usually no more than six to ten feet tall), hydronic heaters can
<br />create heavy smoke and release it close to the ground, where it can linger and expose
<br />people to nuisance conditions and health risks. EPA -certified models are the cleanest
<br />models available.
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