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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.

Gal/Day: Temperature Rise °F:
Energy Unit Cost/Unit Energy Factor Annual Cost 10-yr Cost
Heat pump water heater kWh $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
3412
Oil boiler w/indirect tank gal $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
139000
Natural gas instantaneous ccf $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
102000
Oil boiler w/tankless coil gal $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
139000
Natural gas storage tank ccf $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
102000
Propane (LP) instantaneous gal $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
91500
Propane (LP) storage tank gal $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
91500
Electric tank kWh $ $ $
Assumptions: BTU/Unit Gal/Day Temp Rise
3412

Last updated: 3/02/2021 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.

Water Heating

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