Heatmaster G400 Series


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.

Rugged and Easy to Use

Easy for You

  • Less cleaning and maintenance: The EZ Clean handle makes cleaning the heat exchange tubes a breeze. No need to brush tubes or scrape creosote, you can load and clean your furnace in 5 minutes! 
  • Stay clean while loading: The Smokeless Loading handle lets you enjoy clean, easy loading. Just pull the handle before opening the door to eliminate smoke coming out at you while loading.
  • Less wood cutting: These high efficiency furnaces use up to 50% less wood than conventional furnaces, saving you time cutting and loading wood and cleaning ash.
  • Indoors and outdoors: G Series furnaces are safe and clean enough to be installed in a garage, shop or outbuilding as well.
  • 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.
  • Safe easy-to-use dual firebox door latch – Our carefully designed latch catches the door so it doesn’t swing completely open and expose you to excessive heat.
  • Sight Glass – Located in the bottom front door, this let’s you see the fire in the lower combustion chamber without opening the door.

An Outdoor Wood Furnace that’s Built to Last

  • Titanium Stainless Steel – Titanium enhanced and corrosion resistant, it’s the only product that can provide the right blend of longevity, heat transfer and other critical traits that meet the HeatMasterss standard of excellence.
  • HeatMasterss warranty – We back each furnace with our best-in-industry Lifetime Limited Warranty which is twice as long as the leading mild steel competitor. It confirms our confidence in our products.
  • Rounded firebox – The rounded design gives the firebox more strength with fewer welds.
  • ISO 9001 Certified –
  • HeatMasterss  furnaces are built to the very highest manufacturing standards, employing top notch design and engineering.
  • Heavy duty multi-layer insulation


(W” x L” x H”)

30 x 42 x 40

Firebox Door
(W” x H”)

20 x 20

Water Capacity
(US Gallons)


Approximate BTUs


(W” x L” x H”)

53.5 x 82 x 90

8 hour burn rate

180,409 BTU/hr



8 hour efficiency
(Lower heating value)


8 hour efficiency
(Higher heating value)


Annual efficiency
(Higher heating value)




Furnace Replacement

Our commitment to continuous training helps our employees receive only the best and most extensive knowledge on the latest furnace technology. What makes a great Alberta gas furnace installation? It’s in the way air moves around your house. This is why we custom design our sheet metal fittings so they fit carefully into your home. Not only does it give you the best match, but also a better heating performance.

Great Financing Available

FINANCEIT is the fast, flexible, easy way to pay for your heating, cooling and indoor air quality needs without having to wait. It’s the consumer-friendly financial program endorsed by Roy’s Plumbing & Heating Ltd.