You may heat your home for the full season for the price of one month's electric heat bill if you reside in a suburban or rural region near a source of inexpensive wood. An outdoor furnace requires less maintenance, removes the health risks associated with inside wood burning, and keeps the wood-burning mess outdoors.
There are a surprising number of outdoor furnace manufacturers, all of whom provide a diverse range of shapes and designs to fit a variety of heating capacity and fuel sources. Some of these furnaces have enough capacity (500k Btu) to be used in commercial settings.
All outdoor furnaces are designed to work with any existing heating system and can be thermostatically controlled. If you have a forced-air system, you can use the existing ductwork but you will need to install a water-to-air heat exchanger in your furnace. To purchase the best outdoor wood furnace, you can search for a one-stop-shop for outdoor boiler supplies and support online.
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If you already have radiant floor heating, you'd connect the outside furnace's subsurface feed to the circulating pump. You can either connect the pipework directly to an existing boiler or construct a water-to-water heat exchanger for radiant baseboard heat. With the water-to-water exchanger installed, you'll get free hot water while the existing furnace serves as a backup.
An outdoor boiler can even be used to heat your swimming pool, driveway, workshop, greenhouse, or multiple buildings.