Garn wood boilers refers to the range of residential and commercial wood heating system products by Garn. These products have a maximum heat output rating that ranges from 180,000 to 700,000 British Thermal Units per hour and have empty weights that range between 2,200 and 7,500 pounds.
Each of Garn's wood heating systems is fitted with a combustion chamber with a length between 36 and 50 inches. The user places wood fuel inside the machine and it burns wood inside a combustion chamber to generate heat. The combustion chambers of the various models have volume ranges between 110 and 250 gallons.