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How Much Does It Cost to Run a Heat Pump Water Heater? $14/Month

Running a heat pump water heater at 500 watts for 5.45 hours a day costs about $0.46 a day and $13.90 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $169 a year.

500 W (400–4,500 W)Typical power draw
5.45 h/day, 30 days/monthAssumed use
2.73 kWhEnergy per day

· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

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a heat pump water heater: energy cost only (500 W ÷ 1,000 × hours × rate); fixed fees and taxes extra.
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## How much does it cost to run a heat pump water heater?

The same a heat pump water heater at 5.45 hours a day costs $9.81 a month at 12¢ and $36.79 at 45¢ — usage held constant, only the rate moving:

Table 1: How Much Does It Cost to Run a Heat Pump Water Heater? $14/Month
Electricity rate Per hour Per day Per month Per year
12¢/kWh $0.060 $0.33 $9.81 $119
15¢/kWh $0.075 $0.41 $12.26 $149
17¢/kWh (US avg) $0.085 $0.46 $13.90 $169
20¢/kWh $0.100 $0.55 $16.35 $199
25¢/kWh $0.125 $0.68 $20.44 $249
30¢/kWh $0.150 $0.82 $24.52 $298
35¢/kWh $0.175 $0.95 $28.61 $348
45¢/kWh $0.225 $1.23 $36.79 $448
Typical power draw
500 W (400–4,500 W)
Assumed use
5.45 h/day, 30 days/month
Energy per day
2.73 kWh
Cost per day
$0.46
Cost per month
$13.90
Cost per year
$169

Why this number

Running a heat pump water heater at 500 watts for 5.45 hours a day costs about $0.46 a day and $13.90 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $169 a year. The formula for a heat pump water heater: 500 W ÷ 1,000 × hours × your rate per kWh. For a heat pump water heater your own rate changes the answer: at 12¢/kWh that month costs $9.81, at 45¢/kWh it costs $36.79.

A heat pump water heater rated at 500 watts, run 5.45 hours a day, costs about $0.46 a day — about $13.90 a month, or $169 a year — at the US average electricity rate of 17¢/kWh. That places it 16th of the 40 appliances tracked here — mid-table, but high enough that it is worth being deliberate about how much you use it.

What actually drives this number

A heat pump water heater is an air conditioner pointed at your hot water tank: it pulls heat out of the surrounding room air and puts it into the water, which is why a 500 W compressor does the work a 4,500 W element used to. Run against the DOE test procedure’s medium draw pattern of 55 gallons a day, an ENERGY STAR unit at UEF 3.30 lands near 1,000 kWh a year — roughly a third of a standard electric tank, and the largest single-appliance saving available in most homes. Two things spoil it. Every hybrid model still carries resistance elements that fire in high-demand mode, so leaving it in hybrid rather than heat-pump mode quietly gives back the savings. And the unit needs air to steal heat from: one squeezed into a small unheated garage in January has less to work with and falls back on the elements more often.

Unlike resistance loads, efficiency here is genuinely shoppable — the UEF rating on the EnergyGuide label sets the input watts directly, and it is a large part of why real units span 400–4,500 W. The same refrigeration cycle also runs in reverse: the heat pump , at about $104.78 an in-season month, is what that trick looks like applied to heating.

Where this number comes from

Putting Heat pump water heater in proportion

At 17¢/kWh, a heat pump water heater next to the rest of the bill:

For a heat pump water heater: cooling equipment moves heat rather than making it, so it delivers several units of cooling per unit of electricity. That efficiency is why it beats resistance heating for the same effect, and long run-hours are why it still lands high on the bill. On this site’s own numbers, a heat pump water heater lands at #16 of 40 on the monthly-cost ranking, at about $13.90 for a typical month.

The formula, in full

The 500 W arithmetic for a heat pump water heater, step by step:

  1. Watts to kilowatts. 500 W ÷ 1,000 = 0.50 kW.
  2. Energy per day. 0.50 kW × 5.45 hours = 2.73 kWh.
  3. Cost per day. 2.73 kWh × $0.17 = $0.46.
  4. Cost per month. $0.46 × 30 days = $13.90.

For a heat pump water heater the two levers are run-hours (5.45 h/day here) and your rate; at 5.45 hours a day, 500 W adds up — which is why cooling equipment dominate the rankings.

Other cooling loads: Portable air conditioner ($233/yr), Window air conditioner ($101/yr), Ceiling fan ($11/yr). Closest on annual cost: Home sauna (electric) ($186/yr), Space heater ($191/yr). Across all other cooling loads here, the priciest is Heat pump at $104.78/mo.

The a heat pump water heater table above runs a fixed rate ladder (12–45¢); the state quick-fill uses July 2026 averages from EIA Electric Power Monthly, Table 5.6.A .

Put a heat pump water heater ($13.90 a month) against everything else in the electricity cost calculator , check your state’s rate , or browse all 40 appliances ; year-round high bills: solar savings calculator .

Frequently asked questions

How much does it cost to run a heat pump water heater per hour?

About $0.085 an hour for a heat pump water heater at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), for a 500 W unit. The calculation is 500 ÷ 1,000 × 1 hour × $0.17 per kWh. At 30¢/kWh the same hour costs $0.150.

How much does a heat pump water heater add to my monthly bill?

Roughly $13.90 a month for a heat pump water heater at 5.45 hours a day, 30 days a month, 17¢/kWh. That is about $169 a year if you use it that much year-round. For a heat pump water heater, change the 5.45-hour default to your own use — run-time moves the total as much as the 500 W does.

How many watts does a heat pump water heater use?

Typically around 500 W, with real units ranging from about 400 to 4,500 W depending on size, model and setting. The nameplate on your own unit is the figure to trust — these are typical values for planning, not a measurement of your appliance.

Why is my actual bill higher than the a heat pump water heater figure?

$13.90 a month is the energy cost of a heat pump water heater alone; your bill adds fixed connection charges, delivery fees, taxes and every other load. Add the other appliances in the index to a heat pump water heater for the controllable part of the bill.

How we calculated this

Worked for a heat pump water heater: 500 W ÷ 1,000 × 5.45 h × $0.17 = $0.46 a day; × 30 days = $13.90 a month; × 12 months in use = $169 a year. 500 W and 5.45 h are the typical figures cited for a heat pump water heater; 17¢ is EIA’s 2025 annual US average.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

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