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Heat Load Estimator

This tool can be used to size a new heating system based on a home’s past heating fuel use. It doesn’t work for homes heated with heat pumps or any other type of electric heat.

1. Pick the Town Closest to You

2. Input values for all heating sources used in your home.

3. Boiler used for hot water?

This tool is for heat load estimates only and may not be accurate for all homes and uses. If you have any concerns, hiring a professional to perform a more customized estimate may be appropriate.