We speak HVAC so you don't have to
CONNECT with us!

our tools and detailed reports
can help you choose the best
furnace, boiler, heat pump or
central air conditioner.

HeatMaster G Series Wood Furnace

Updated: Feb 2, 2016

Write a review
Read more about HeatMaster Wood Furnaces

Overview of the G Series

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.

Ask a Question about your HeatMaster G Series
Read all questions and answers

Consumer Reviews of the HeatMaster G Series

Compare to Other Heatmaster Wood Furnaces:
#1  of 2 Heatmaster Wood Furnaces
5 of 5 stars 5 reviews

  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied

Date created: 2016-01-31 Name: A. Walters
Location: Westport, MA

Satisfaction Rating:

5 of 5 stars Very Satisfied

"Great boiler!"
Installed our Heatmaster SS G-200 this year and so far we love it. It's heating our 1840 un-insulated house easily at 70 degrees. Wood consumption is fair and no smoke. More hot water than you could ever use. Wish they were a little less costly so more people could afford one.

Date created: 2016-01-22 Name: J Sinclair
Location: Canterbury, NH

Satisfaction Rating:

5 of 5 stars Very Satisfied

"Heatmaster G200"
I bought this Outdoor Gassification Wood Boiler to replace a 25 year old Hardy H4 model conventional outdoor wood boiler. I live in New Hampshire and was using between 12-14 cords per 6 months of heating season. So far I have cut my wood usage down to just over 1 cord per month which will bring me to about 7.5 cords per 6 month heating season. I have had no issues with the boiler so far. Once a coal bed of 2-4 inches is established I just load the amount of wood I think that I will need to get me to the next loading (typically 12 hours). My wood moisture is between 20-25%. I have not yet cleaned any ashes from the primary burn chamber after 4 cords of wood. I rake out the ashes from the Secondary reaction chamber after each cord of burning and remove approximately 3 spade shovel fulls of ash.

Date created: 2016-01-18 Name: Martin Lappin
Location: North Liberty, IN

Satisfaction Rating:

5 of 5 stars Very Satisfied

"Review of G400"
I researched many different brands of stoves over the last two years, 409 stainless was a requirement as my first stove, a homebuilt Central Boiler knockoff was suffering from some serious corrosion problems. I had even started to collect parts to build my own gassifier. After doing an extensive Google search on Heatmaster SS and reading the reviews from other owners I decided to buy a stove from them rather than risk building one out of a material I hadnít had a lot of experience fabricating and welding before. Even though I had plenty of time to buy a conventional before the end of the year I still decided on a G Series as the appeal of burning less wood was very appealing, and burn less it does. Iím heating a 2800 square foot 1800ís farm house with a lot of single pane wood frame windows that need changed out, and so far out of the exterior rooms weíve remodeled everyone had voids in the walls where the blown-in cellulose didnít reach. The shop is a converted pole/cow barn with not even a vapor barrier under the cement let alone any insulation around the perimeter; itís insulated with the foil-bubble-foil insulation and still needs to be tightened up more. The G400 easily heats the house and with the below zero nights weíve had lately I still keep the shop at 40-45 at night, and I can also run my snow melt as well which is 110í of sidewalk. My old stove couldnít do all three no matter how much wood was shoved in through the day and sometimes could barely handle two. Earlier in the year when we had 40-50ís for daytime highs and just getting to freezing at night I was having a steel rack of wood (holds half a cord) last 14 days. Now with the highs in the single digits, lows below zero at night and a -20 windchill I still expect to get at least four days out of half a cord and maybe part of a fifth. At most Iím looking at 4 cords a month during the most bitter part of the winter. So far Iíve had zero problems with bridging or maintaining a coal bed. Iím burning Ash that was cut last winter, split then thrown in a pile. All is burning well even with the excessively wet summer we had here. Iíve also gone into the woods and cut dead ash, cherry and elm pole trees and have burnt those as well with no problems. Large pieces have been 12-14Ē diameter, just need to add enough smaller pieces to maintain a coal bed. All of it was under 25%, Iíve burnt some wetter stuff that was laying on the ground in the woods but works better if itís mixed with equal parts of dry wood. Work the cleaning handle on the side once a day then depending on how much wood has been run through it I clean the bottom every 4-7 days. So far, it takes less than five minutes to do weekly maintenance. The powered draft with the bypass door is an excellent feature. We eat breakfast at our local American Legion every Sunday morning, with my old one I either filled it before we left, then came in and changed clothes or put it off till we got home. With the G Series I can go out in my good clothes, fill the stove before we leave for breakfast and Iíve yet to have anyone mention that I smell like wood smoke. Overall Iíve been very satisfied with my purchase, so much so that I decided to also sell Heatmaster SS products.

Date created: 2016-01-18 Name: Richard Emmons
Location: Lyman, ME

Satisfaction Rating:

5 of 5 stars Very Satisfied

"G 200"
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 (mainly_custom@yahoo.ccom ) if you have any questions regarding the G Series boilers from HeatMaster.

Date created: 2015-12-19 Name: B Earls
Location: Saratoga, NY

Satisfaction Rating:

5 of 5 stars Very Satisfied

"Gasification furnace."
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

Find Local Contractors

1. I need a new:

2. My zip code is:

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

Copyright 2002 - 2016 furnacecompare.com