GasorPlug
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Hot water

Gas water heater or electric water heater?

What each costs to run for a year. Fill in what you know; anything you leave blank uses a typical rating or United States (national average)'s average price.

Your numbers

55 gallons is the U.S. DOE test's medium-usage day. Blank = 55.

The DOE test heats 58°F water to 125°F: a 67°F rise. Blank = 67.

Uniform Energy Factor on the spec sheet or the yellow EnergyGuide label. Blank = 0.64.

Left blank, this is a heat pump water heater (3.75; most are 3 to 4). A plain electric tank is about 0.9: type that if it is the one you have or would buy. Blank = 3.75.

Prices blank = United States (national average) average

Your bill's price per unit, taxes and delivery charges included, is the most accurate number. Where the averages come from

Purchase prices and CO2 (optional)

Payback is worked out only when both purchase prices are filled in. Count only rebates or credits you know you qualify for.

Fill in what you know, then Compare

Pressing Compare with every box blank shows the typical case with United States (national average)'s average prices. Then change one number at a time to see what moves the result.

  • Hot water your home uses a day55 gallons
  • How much the water is heated67 °F
  • Gas water heater rating (UEF)0.64 UEF
  • Electric water heater rating (UEF)3.75 UEF

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