HeatMaster G Series Wood Furnaces

HeatMaster G Series Wood Furnace Overview

The HeatMaster G Series is a gasification wood furnace approved for indoor and outdoor installation. The gasification process reduces wood consumption, and its low maintenance design allows easy loading and cleaning. It is available in water capacities of 100, 195 and 250 gallons and a heating capacity of up to 350,000 BTU. The unit is constructed of 409 stainless steel for greater heat transfer and tolerance and features heavy duty multi-layer insulation. An insulated hinged rear door provides easy access to the rear of the furnace, and a dual firebox door latch is designed for safety. The 2016 starting price of the G Series wood furnace is $8,495.00.

Questions about this model?

Consumer Reviews of HeatMaster G Series


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #2 of 4 HeatMaster Wood Furnace
  • 91.89% of customers recommended

Read Reviews of Other HeatMaster Products

Find ratings and reviews for HeatMaster Coal Furnaces, Wood Furnaces and more

Read Reviews

Top 10 Wood Furnaces

See who made our list of the best Wood Furnaces of 2022.

See the Top Products

Find a Certified Heating & Cooling Professional In Your Area

Contact a top-rated local expert to help with all of your home's HVAC needs.

HeatMaster G Series Wood Furnace Reviews

Showing 36-37 of 37 reviews

"G 200"

5.0 rating
Very Satisfied

In full disclosure, I am a HeatMaster distributor! I have been selling, servicing and installing outdoor wood boilers now for over 10 years. I have worked with many different outdoor wood boiler products over the years and the G series is in my opinion top of the line! We are certainly not perfect but what attracted me to HeatMaster in the first place was the way that the company took care of any issues in the field, I have seen it first hand as I do service work on all types of outdoor wood boilers. This unit is the easiest wood gassifier to operate, service, clean and maintain on the market. The fact that it is 409 stainless construction at first had me concerned but after seeing several brands built from mild steel corrode through and leak in less than 2 seasons, I took the trip to the factory to watch it be built. They opened up anything I asked to see and I was very impressed at the quality control care taken in the building process. After picking through the process over a 3 day visit, I decided to come on board with HeatMaster, Great product, fair pricing, Awesome people and an honest warranty! If you are in the market for an outdoor wood boiler, this is top of the line! Please feel free to contact me directly at ([email protected] ) if you have any questions regarding the G Series boilers from HeatMaster.

Richard Emmons

Lyman, ME

"Gasification furnace."

5.0 rating
Very Satisfied

Hello, New to the forum, I wanted to do a review for the people on the forum and also for readers that are just cruising through looking for good info. I purchased a HeatMaster SS G-200 back in August after doing a lot of research on many different brands that are out there. Looking at all materials used in the different units and how they hold up, I learned that mild steel, boiler plate, 304 stainless steel, cast iron, are not the materials that are the best. They all have problems with heat transfer, cracking, water leaks, rapid corrosion. The 409 stainless steel overcomes all that. After seeing one in operation at the Boonville, New York logging show, I was impressed with the quality and amount of stainless that is used in the units. I purchased one that was at the show and the dealer delivered it on his way home. Thank you Bob. I removed my old Marathon boiler which was way too small for my house and garage that I added. I Installed the G-200, in a few days it was up and running. Always comes up fast to high temperature, which is good for 200 gallons of water. Quick recovery! With dual inlet and outlet ports it was an easy hookup, one set to house one set to garage. Fired it up, pretty easy to do with the blower on. It smoked a little until it started to gasify, then it cleared up and just heat waves out the stack. I burned pine until mid November with no problems and plenty of heat on the cold nights. Switching over to hardwood in November. It has been warmer this winter than last. I have been getting about 20 hour burn time on the wood, just heating the house on 28*F nights. HeatMaster made it easy to clean the heat exchanger tubes with the external handle. And the smoke bypass pulls the smoke away from you while you are loading. Easy ash removal on the bottom, less than a minute to do, maybe twice a month. I am very happy with this unit and the support I have received not only from the dealer and distributor, Slimjim, but at the factory level also. They all will answer the phone and return your calls. Thank you HeatMaster SS for building a quality outside wood furnace. Definitely refer a friend to HeatMaster SS. Best regards, Smokeless in NY

B Earls

Saratoga, NY

Other G Series Reviews

Online comments regarding the G Series seem to be mostly positive. Most responses to a homeowner on outdoorwoodfurnaceinfo.com who was thinking of buying one were very positive and said that it is a great unit, though a couple did mention that gasification units require more care than conventional units.

G Series Warranty

The warranty for the HeatMaster G Series wood furnace is comprised of the following:

  • Lifetime Limited Workmanship and Corrosion Warranty

HVAC Brands

Learn more about your home's heating and cooling system with our guides, how-to's, FAQ's, tips and more.

Ready to get a quote from an HVAC contractor?

Let us know what type of service you need and we can connect you with a certified local HVAC contractor.

Please enter a valid name

Please enter a valid phone number

Please enter a valid zip code

There are no dealers in this zip code.

Please enter a valid email address

Please select repair or replace

Please select heating, cooling or both