Your approximate annual savings is calculated based on a 0% savings of the annual cost of heating an entire home and using a hearth appliance to heat 1/5th of the home. It is based on the assumption that an average home uses 52 Million BTUs annually.

Zone heating helps save 30% on a heating bill and adds 6 Million BTUs for the additional usage of the hearth product. Estimated fuel costs are national averages from the Energy Information Administration and other sources.