Products G Series Furnace


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Approx. Heating Space: 3000 sq. ft.

Maximum BTU’s: 120,000/hr

Water Capacity: 90 (US Gallons)

Firebox: 19” x 20” x 30”

Firebox Door:
16” x 16”

Weight: 1,200(lbs)

Outlets 1 set of 1” feed and return (can be teed)

Chimney Size: 6”

Dimensions: 38.5” x 57” x 77”

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Approx. Heating Space: 5000 sq. ft.

Maximum BTU’s: 232,000/hr

Water Capacity: 195 (US Gallons)

Firebox: 28” x 30” x 36”

Firebox Door: 20” x 20”

Weight: 1,900(lbs)

Outlets 2 sets of 1” feeds and returns

Chimney Size: 6”

Dimensions: 53” x 70” x 84”

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Approx. Heating Space: 8000 sq. ft.

Maximum BTU’s: 340,000/hr

Water Capacity: 260(US Gallons)

Firebox: 30” x 42” x 40”

Firebox Door: 20” x 20”

Weight: 2,650(lbs)

Outlets 2 sets of 1.5” feeds and returns

Chimney Size: 8”

Dimensions: 53.5” x 82” x 90”


Of all furnaces sold in 2016, the Heatmaster G Series was ranked #1 based on consumer ratings, efficiency and pricing.

Indoors & Out

Eliminate the barriers to safe, comfortable loading! A G Series furnace carries the necessary safety features to be installed indoors or outdoors. This allows you to select the ideal location in your garage, shop or in your yard for your furnace installation to make loading convenient.


Your Heatmaster furnace can easily tie in to almost any existing heating system. You can keep your existing heat source as a backup.

  • Multiple buildings can be heated with one furnace.
  • The HeatMaster system is perfect for garages, shops and other outbuildings. It will power an overhead forced air heating unit or in-floor systems can be easily used.
  • Use a high quality insulated underground pipe to bring the hot furnace water in to your building.

Additional Features

Smokeless Loading
Just pull the handle to direct the smoke away from you while you load.

EZ Clean Handle
The EZ Clean handle makes cleaning the heat exchange tubes a breeze. No brushing tubes or scraping creosote, you can load and clean your furnace in 5 minutes?

Sight Glass
With the sight glass, you can always check the fire without opening any doors and disturbing the burning.

Modern Finish
The smooth side finish has a pleasing look that’s also easy to wipe down and keep clean.

G Series Cutaway