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Sizing an Outdoor Boiler - Choosing The Right Outdoor Furnace For You

We are often asked how to tell what size of boiler you need for home. This article will show you how to choose the right outdoor wood furnace for your heating needs. So without further ado, let's jump into it.

Step 1.

Add up the square footage of the ground floor of the building you want to heat.

Step 2.

Tally the square footage of your basement or upper floor and divide it by two. Add this number to the tally you got from step 1.

Step 3.

Take into account the insulation quality of your home. For example, a poorly insulated house require twice the heating capacity needed to heat a well insulated structure.

Step 4.

Determine what temperature you want to maintain throughout the winter. For example, keeping a shop at fifty degrees or at seventy degrees can significantly affect the heat load on your outdoor boiler.

Step 5.

Take the total square feet you've come up with and go outdoor furnace shopping. Below are all the outdoor wood furnaces we currently offer as well as approximately how much space they will heat. Please note that persons living in the north i.e. Wisconsin or Minnesota, will need significantly bigger boilers than someone from Virginia or Maine might use.

Outdoor Wood Furnace Sizes

HeatMaster G-Series

G100 - The G100 furnace is rated at approximately 120,000 BTUs. That means it's capable of heating up to 3000 square feet in the South or around 2000 feet max in the North.

G200 - The G200 is, as the name suggests, about twice as mighty as the G100. Capable of heating around 6000 square feet in the South or around 5000 square feet in colder regions, it is rated at 232,000 BTUs.

G400 - The largest of the G-Series outdoor furnaces, this boiler is capable of heating up to 10,000 square feet and is rated at 340,000 BTUs.

HeatMaster C-Series / MF-Series

MF3000e/C150 - This unit is capable of maintaining a heat load of up to 2500 sq. ft. and is rated at 150,000 BTUs.

MF5000e/C250 - This boiler can heat up to 5000 square feet and is rated at approximately 250,000 BTUs.

MF7000e/C375 - Capable of heating up to 7000 square feet, this outdoor furnace is rated for a max BTU output of 375,000.

MF10,000e/C500 - This furnace can heat up to 10,000 square feet and is rated at 500,000 BTUs.

MF20,000e/C800 - The mightiest of the C/MF-Series, this unit can easily heat up to 20,000 square feet of commercial buildings, greenhouses, barns and etc.

HeatMaster B-Series

B500 - Capable of serving up a steady 500,000 BTUs per hour, this autofeed chip boiler can heat large commercial buildings up to and well over 20,000 sq. ft.

Please feel free to contact us any time for help sizing an outdoor boiler!

Certified Boiler Treatment - Wood Furnace Water Treatment

Certified Boiler Treatment - Wood Furnace Water Treatment

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Pineview Woodstoves LLC

768 15th. Ave.

Almena, Wisconsin 54805


Pineview Woodstoves distributes MF-eSeries, Heatmaster G-Series, and C-Series Heatmaster outdoor wood boilers in Wisconsin and parts of Eastern Minnesota. Outdoor wood-fired hydronic heaters can heat multiple buildings, hot tubs, pools, greenhouses and more. A Heatmaster outdoor wood burning furnace eliminates most of the issues connected with indoor wood burning and can be connected to almost any existing heating system with very little difficulty.

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