HeatMaster G4000 High Efficiency Outdoor Wood Boiler


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SKU: G4000 Category:


The HeatMasterss G Series is widely recognized as the flagship furnace of the industry. Many new innovative features make the new G Series line of furnaces the easiest to operate, longest lasting and highest performing in all real world applications.

Cruise Control for Your Boiler

The G Series is the only outdoor furnace that measures the exhaust and adjusts the air to guarantee the best real world performance and efficiency.

Stay Clean & Safe While Loading

The Smokeless Loading Handle turns on the fan and vacuums the smoke up the chimney and away from you while loading.

Simplified Cleaning & Maintenance

No brushes, scrapers, chains or tools! The EZ Clean Handle makes quick and easy work of cleaning the heat exchange tubes.

Stay Out of the Weather with Indoor Installation

Most furnaces can only be installed outdoors. The G Series is also UL listed and CSA approved for installation in a garage, shop or other outbuilding.

Optimal performance in all places and at all times.

hs easy to use

Built to Last

Designed with a Purpose

Our in-house team of expert engineers design every aspect of our boilers to achieve maximum performance and longevity in real world applications. From the water jacket to the wiring, the G Series is fabricated to be the longest lasting, most rugged furnace available.

Titanium Enhanced 409 Stainless Steel
  • Resists Corrosion
  • Withstands Higher Continuous Temperatures
  • Transfers More Heat
  • Doesn’t Crack or Warp
Best-In-Industry Lifetime Limited Warranty

We back each furnace with our best-in-industry Lifetime Limited Warranty, twice as long as the leading mild steel competitor.

Rigorous Testing and Quality Control

Our ISO 9001 Certified Manufacturing Processes, extensive field testing and ongoing quality control checks mean world class consistency in every furnace we build.

  • Approx. Heating Space*4,000sq. ft.
  • 8 Hour Burn Rate93,000 BTU/hr
  • Water Capacity116 gallons
  • Firebox Volume8.5 ft3
  • Recommended Wood Length18-20″
  • Firebox Dimensions (L” x W” x H”)23″ x 22″ x 29″
  • Firebox Door20″ x 20″
  • Weight1,353 lbs
  • Outlets1 set of 1” and 1 set 1.5″
  • Chimney Size6”
  • Dimensions*** (L” x W” x H”)62″ x 41″ x 79″
*Well-insulated building. **BTU’s are approximate and will vary depending on fuel quality. *** Height of the furnace is to the top of the lift hook

Additional information

Weight800 lbs
Dimensions48 × 48 × 60 in