Compare Water Heating Costs
This calculator shows approximate costs of heating water for a typical family. Gallons-per-day, temperature rise, cost-per-unit, and energy factor values are all adjustable.
Last updated: 10/16/19 This calculator is for comparison purposes only. Actual performance may vary.
- To talk with a professional about upgrading your water heating system, contact an Efficiency Maine Residential Registered Vendor.
- Click here for a chart based on default values.
- Your fuel prices may differ. Check up-to-date and regional pricing.
- Learn about Efficiency Maine’s heat pump water heater rebates.
kWh (Kilowatt hour) – A unit of electricity.
ccf (100 cubic feet) – Hundreds of cubic feet of natural gas. It’s also 1,020 BTUs or 1.032 therms.
LP (liquefied petroleum) – Liquefied petroleum gas. Also referred to as propane or butane gas.
Energy Factor – A measure of efficiency. An energy factor of 0.50 is 50% efficient.
Temperature Rise – The temperature difference between the cold and hot water. Typical incoming water is 50°F and is generally heated to 120°F, so the typical temperature rise is 70°F.
Gal/Day – Gallons per day of hot water used. A typical family uses 50 gallons per day.
Gal – Gallon.