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Do I need to use antifreeze in my outdoor wood boiler?

Outdoor Wood Boiler Antifreeze

A question we are often asked is "Do I need to run antifreeze in my outdoor wood boiler?" The answer is simple: Do you want to run antifreeze in your outdoor wood boiler? Although there are some situations in which we recommend running antifreeze, as a general rule it is more economical to just use water and keep your pump running. A few scenarios where antifreeze is a good option include vacation homes, cabins, or persons who like to let their system default to a backup heat source, rather than their outdoor wood furnace, while they're away on a trip.

This brings us to the question of what kind of antifreeze to run. We recommend using propylene glycol antifreeze because it's non-toxic, and non-corrosive. Do not run RV antifreeze in an outdoor wood boiler!

Finally comes the question how much antifreeze do I need to add to keep my unit safe from the elements? To fully protect your system, you should add at least 1 part antifreeze to 1 part water. Feel free to contact us with any additional questions.

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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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