An outdoor wood furnace that’s rugged and easy to use.

An outdoor wood furnace that’s rugged and easy to use.

Heatmasterss creates the best outdoor wood furnaces available. These rugged hot water furnaces will save you time and money because they have been designed and constructed to be the most durable and convenient on the market.

A wood heating system allows you to eliminate your heating bill and can often tie in to your existing heating system. Contact one of our dealers today to learn more about the very best outdoor furnaces for your home or business.

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Rugged and easy to use. It uses around half the wood of a conventional furnace!


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What are Outdoor Wood Furnaces?

Heatmasterss indoor/outdoor furnaces are among the most effective wood boilers available today. These furnaces, sometimes referred to as wood boilers, wood furnaces, or hydronic heaters, are typically placed outdoors, however, the G Series models may also be placed indoors in a garage, shop or outbuilding.

Indoor/outdoor wood furnaces heat the water in the water jacket surrounding the firebox and distribute it through insulated pipes to the building they are heating. The hot water ties into the existing heating systems through a heat exchanger and can also provide domestic hot water, if desired.

Why is 409 Stainless Steel the best choice for Indoor/outdoor Furnaces?

We combine the best materials with expert engineering to create the most rugged, longest lasting indoor/outdoor furnaces available.

Titanium enhanced, corrosion resistant 409 Stainless Steel is the only product that can provide the right blend of longevity, cost-effectiveness and other critical traits that meet the Heatmasterss standard of excellence.

Where can Outdoor Furnaces be Used?

Our indoor/outdoor furnaces have many uses. Along with central heating and hot water for a residence or business, they can provide heat for hot tubs, swimming pools, pressure washers, driveway snow-melt systems, clothes dryers, shops, barns, and almost anything you can imagine that needs a heat source around the residence.

Will Wood Heating Save Me Money?

Heatmasterss indoor/outdoor furnaces are built to last, so once the cost of the unit is accounted for, you will have many years of free or inexpensive heat to look forward to. Your Heatmasterss dealer will provide service and replacement parts to keep your furnace running for many years. Heatmasterss offers a Limited Lifetime Warranty that is twice as good as the leading mild steel competitor. You can be confident that we stand behind our furnaces.

Advantages of 409 Stainless Steel

Heat Tolerance

409 Stainless Steel can withstand continuous temperatures of up to 1400º F while carbon steels used in other outdoor furnaces begin to oxidize at 800ºF. When other furnaces start to breakdown in high temperatures, our furnace just keeps going.  When we say durable and long-lasting, we really mean it.

Corrosion Resistance

409 Stainless Steel has a chromium oxide film which stops rust. Steel that is not treated will begin corroding immediately.

Heat Transfer

409 Stainless Steel has the best heat transfer capability of any steel used in indoor/outdoor furnaces, having about 60% more heat transfer capability than 304 stainless steel.


Why are we able to use thinner material in our indoor/outdoor furnaces? Because 409 Stainless Steel was designed and developed for high temperature situations and to withstand corrosion.

Thermal Expansion/Warping

409 Stainless Steel outperforms all other stainless steels because it has a very low expansion rate. This is why you will see furnaces made out of 304 Stainless Steel warp and spider-crack.