HIGH-EFFICIENCY, GASIFICATION WOOD BOILER AND THERMAL STORAGE IN ONE UNIT

GARN is the only heating system that can save you money by using: wood, thermal solar, and off-peak electric - individually, or all-together. A complete, all-in-one renewable heating system for your business or home.

TECHNOLOGY

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Learn about the GARN Wood Heating System:
  • Combustion design and heat exchange
  • Thermal storage
  • Operation
  • Connections and pieces

Articles and News

Firebrick Rating and Availability – December 2020

Each GARN® WHS unit has a combination of #1 and #2 brick splits. #1 splits are the thinner 4.5” x 9”x 1.25” brick that stand on edge along the sides of the combustion chamber. The #2 splits are the thicker 4.5”x 9”x 2” brick that lie transversely on the bottom of the combustion chamber. Because of the high temperatures experienced in the combustion chamber only Hi-duty firebrick (rated to 2,700 F or higher) are recommended. All brick sold in the GARN store have been upgraded by our supplier to a maximum service temperature of 2,850 F. Standard “fireplace” brick does not have the Hi-duty rating, thus will not survive in GARN WHS equipment. Click here to read more.

DOWNLOAD MANUALS

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The GARN Owner’s Manual:

everything you need to know to install and maintain your GARN Wood Heating System.
WHS 1000/1500/2000 Manual
WHS 3200 Manual

The GARN System Design Manual:

learn how to design your hydronic system, connect to an existing pressurized system, and plumb your GARN correctly.

System Design Manual

The Electric Heating Manual (updated as of June 10, 2019):

learn how to wire and interface the GARN Electric Heating Package with your GARN thermal storage.  Perfect for taking advantage of low-cost off-peak rates:

Electric Heating Manual

More info:

SIZING AND SELECTION

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Which GARN® WHS Model Best Fits Your Application?
  • Find out by using our Sizing Calculator.
  • You’ll need one of your monthly heating bills handy.

More info:


GARN® EMISSIONS & EFFICIENCY DATA

The test results above are certified by an independent lab using the ASTM 2816 Appendix 1 test method (for units with full thermal storage), market available cordwood fuel, and production equipment.

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