Heatmaster SS G Series

Our HeatMasterSS G Series is the most efficient outdoor furnace we offer. Our innovative gasification process reduces wood consumption by up to 50% compared to a standard hot water wood furnace.
Crafted with premium workmanship and innovative design, our G Series furnaces work with almost any existing heating system and follow the HeatmasterSS standard for quality.

Features include:

  • Smoke free loading – Stay clean and smoke free when loading your furnace.
  • Clean, low maintenance design – No brushing tubes, scraping creosote or shovelling ash. Load and clean your furnace in 5 minutes!
  • Approved for indoor and outdoor installation
  • Heatmasterss warranty – We stand behind every furnace we sell with a Lifetime Limited Workmanship and Corrosion Warranty.
  • Easy access hinged rear door – The insulated rear door is built with a unique hinge design which allows for easy access to the rear of the furnace and quick and easy removal of the door if required without the use of tools or hardware.
  • EPA Certified
  • Safe easy-to-use dual firebox door latch – Our carefully designed latch catches the door so it doesn’t swing completely open and expose the user to excessive heat.
  • Heavy duty multi-layer insulation
  • Powder coat finish

G100 – Contact Don For Pricing

The G100 is our smallest entry in of our gasification furnaces. It’s perfect for a home or small outbuilding and is compact enough to be easily installed indoors.


Firebox (W” x L” x H”)19 x 20 x 30
Firebox Door (W” x H”)16 x 16
Water Capacity (US Gallons)90
Approximate BTUs120,000
Dimensions (W” x L” x H”)38.5 x 57 x 77
8 hour burn rate47,772 BTU/hr
8 hour efficiency (Lower heating value)81.50%
8 hour efficiency (Higher heating value)75.80%
Annual efficiency (Higher heating value)68%

G200 – Contact Don For Pricing

Our top selling gasification furnace, the G200 is a workhorse! Capable of supplying heat to a home and small shop or one large building. Ask us how the G200 can be put to work for you.


Firebox (W” x L” x H”)28 x 30 x 36
Firebox Door (W” x H”)20 x 20
Water Capacity (US Gallons)195
Approximate BTUs232,000
Dimensions (W” x L” x H”)53 x 70 x 84
8 hour burn rate111,315 BTU/hr
8 hour efficiency (Lower heating value)85.0%
8 hour efficiency (Higher heating value)79.0%
Annual efficiency (Higher heating value)75%

G400 – Contact Don For Pricing

One of the largest gasification furnaces available, the capacity of this unit makes it suitable for many large load applications. It’s capable of heating up to 4 applications at the same time, a home and large shop or a commercial sized shop. It may be all you need for multi-building, high demand applications.


Firebox (W” x L” x H”)30 x 42 x 40
Firebox Door (W” x H”)20 x 20
Water Capacity (US Gallons)260
Approximate BTUs340,000
Dimensions (W” x L” x H”)53.5 x 82 x 90
8 hour burn rate180,409 BTU/hr
8 hour efficiency (Lower heating value)80.50%
8 hour efficiency (Higher heating value)74.8%
Annual efficiency (Higher heating value)74.4%