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Mass Save Residential Water Heater Replacement Calculator

Use this calculator to estimate the approximate costs of heating water based on equipment type for a family of four.

Equipment size, temperature rise, cost-per-unit, and energy factor values are all adjustable.
To use a different fuel costs and/or energy factor, type the new values into the fields and then click “Calculate” below.

I am a customer of one of the Mass Save Sponsors My Current Water Heater:		Equipment Size: Tank Size: gallons Cost: Incentive:		Estimated Usage: gallons per day Temperature Rise °F:

	Energy Unit	Cost/Unit	Annual Cost	10-yr Cost
Electric tank	kWh	$	$	$
Heat pump water heater	kWh	$	$	$
Natural gas instantaneous	therm	$	$	$
Natural gas storage tank	therm	$	$	$
Oil boiler w/indirect tank	gal	$	$	$
Oil boiler w/tankless coil	gal	$	$	$
Propane (LP) instantaneous	gal	$	$	$
Propane (LP) storage tank	gal	$	$	$

Disclaimer

This calculator is for comparison purposes only. Actual performance may vary.

Default energy prices last updated: 07/22/2025.

About Us

Together, we make good happen for Massachusetts.

Your local electric and natural gas utilities and energy efficiency service provider are taking strides in energy efficiency: Berkshire Gas, Cape Light Compact, Eversource, Liberty Utilities, National Grid and Unitil.

As one, we form Mass Save®, with the common goal of helping residents and businesses across Massachusetts save money and energy, leading our state to a clean and energy efficient future.

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To learn more, visit MassSave.com