The GARN Wood Heating System (WHS) is a wood boiler that combines full heat storage with a patented wood-gasifier combustion design in a single piece of equipment. This unique combination of technologies means wood burns so hot and efficient that a GARN squeezes virtually all available heat out of each cord of wood while eliminating smoke and creosote. When you purchase a GARN, you’ll own the highest-efficiency, lowest-emissions wood boiler available.

Our wood woiler models range in output from 160,000 BTUH to 700,000 BTUH and can be used individually or in tandem to serve residential and commercial heating applications. GARN wood boilers are certified to UL and CSA criteria for use in the US and Canada.

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    Heats Up To: 5,000 sqft

    Efficiency: 87 %

    Emissions: 0.19 lb/mmbtu



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      Heats Up To: 7,500 sqft

      Efficiency: 73 %

      Emissions: 0.14 lb/mmbtu



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        Heats Up To: 10,000 sqft

        Efficiency: 82 %

        Emissions: 0.07 lb/mmbtu



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          Heats Up To: 20,000 sqft

          Efficiency: 85 %

          Emissions: N/A



          Manufacturer’s Rated Heat Output Capacity (BTU/HR) :
          160,000 177,000 200,000 700,000
          Efficiency (LHV) :
          86.6% 73.3% 82.0% 85.0%
          Energy Stored (120 F to 195 F) (BTU’s) :
          649,100 892,300 1,196,900 2,083,000
          Firebox Volume (cu ft) :
          14.7 17.4 17.4 33.4
          Firebox Length (inch) :
          32.0 40.0 40.0 50.0
          Water Capacity (gallons) :
          1,015 1,420 1,830 3,200
          Weight Empty (lbs) :
          2,200 3,140 3,570 7,500
          Weight Full (lbs) :
          10,630 15,000 18,830 34,500
          Supply/Return Ports :
          1-1/2″ FPT
          1″ MPT
          2″ FPT
          1-1/2″ MPT
          2″ FPT
          1-1/2″ MPT
          3″ FPT
          2-1/2″ MPT
          Auxiliary Ports, 3/4″ :
          2 x Front 1 x Back 2 x Front 1 x Back 2 x Front 1 x Back 3 x Front 0 x Back
          Flue Specification :
          UL-103HT
          6″ ID, Double Wall
          1″ Packed Insulation
          UL-103HT
          6″ ID, Double Wall
          1″ Packed Insulation
          UL-103HT
          6″ ID, Double Wall
          1″ Packed Insulation
          UL-103HT
          8″ ID, Double Wall
          1″ Packed Insulation
          Flue Configuration :
          Vertical or Horizontal Vertical or Horizontal Vertical or Horizontal Vertical

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