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How Much Does It Cost to Run an Electric Water Heater? $39/Month

Running an electric water heater at 4,500 watts for 1.7 hours a day costs about $1.30 a day and $39.01 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $475 a year.

4,500 W (3,800–5,500 W)Typical power draw
1.7 h/day, 30 days/monthAssumed use
7.65 kWhEnergy per day

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

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an electric water heater: energy cost only (4,500 W ÷ 1,000 × hours × rate); fixed fees and taxes extra.
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Slider nudges the rate for an electric water heater; the URL keeps it.

## How much does it cost to run an electric water heater?

The same an electric water heater at 1.7 hours a day costs $27.54 a month at 12¢ and $103.27 at 45¢ — usage held constant, only the rate moving:

Table 1: How Much Does It Cost to Run an Electric Water Heater? $39/Month
Electricity rate Per hour Per day Per month Per year
12¢/kWh $0.540 $0.92 $27.54 $335
15¢/kWh $0.675 $1.15 $34.42 $419
17¢/kWh (US avg) $0.765 $1.30 $39.01 $475
20¢/kWh $0.900 $1.53 $45.90 $558
25¢/kWh $1.125 $1.91 $57.37 $698
30¢/kWh $1.350 $2.29 $68.85 $838
35¢/kWh $1.575 $2.68 $80.32 $977
45¢/kWh $2.025 $3.44 $103.27 $1,257
Typical power draw
4,500 W (3,800–5,500 W)
Assumed use
1.7 h/day, 30 days/month
Energy per day
7.65 kWh
Cost per day
$1.30
Cost per month
$39.01
Cost per year
$475

Why this number

Running an electric water heater at 4,500 watts for 1.7 hours a day costs about $1.30 a day and $39.01 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $475 a year. The formula for an electric water heater: 4,500 W ÷ 1,000 × hours × your rate per kWh. For an electric water heater your own rate changes the answer: at 12¢/kWh that month costs $27.54, at 45¢/kWh it costs $103.27.

An electric water heater rated at 4,500 watts, run 1.7 hours a day, costs about $1.30 a day — about $39.01 a month, or $475 a year — at the US average electricity rate of 17¢/kWh. That places it 6th of the 40 appliances tracked here — in the top quarter, well above the typical household load, so how much you run it genuinely shows on the bill.

What actually drives this number

The element is rated around 4,500 W but only fires while reheating the tank, so effective run-time is well under two hours a day for a typical household — not the three or four hours a nameplate-times-clock-hours estimate suggests. Standby loss is a real part of the bill, which is why heat-pump water heaters and tank insulation pay back here more than on almost any other appliance.

At 4,500 W every hour of this load costs about $0.77 and no more efficient unit exists to buy — resistance heat is resistance heat. The same physics is why, at whole-house scale, the real decisions are between technologies rather than models: the heat pump vs gas furnace running-cost comparison works out when moving heat beats making it, and the winter heating fuel comparison prices electric resistance against gas, propane and oil per unit of heat actually delivered.

Where this number comes from

Putting Electric water heater in proportion

At 17¢/kWh, an electric water heater next to the rest of the bill:

For an electric water heater: making heat is where household electricity goes, but how it is made decides the bill. A resistance element — an oven, a dryer, a resistance furnace, a kettle — converts every watt into exactly one watt of heat, so a cheap appliance and an expensive one with the same rating cost the same to run and efficiency is not something you can shop for. Equipment that moves heat instead of making it, like a heat pump, delivers several units of heat per unit of electricity and breaks that rule entirely. The only levers on a resistance load are running it less, running it lower, or heating a smaller space. On this site’s own numbers, an electric water heater lands at #6 of 40 on the monthly-cost ranking, at about $39.01 for a typical month.

The formula, in full

The 4,500 W arithmetic for an electric water heater, step by step:

  1. Watts to kilowatts. 4,500 W ÷ 1,000 = 4.50 kW.
  2. Energy per day. 4.50 kW × 1.7 hours = 7.65 kWh.
  3. Cost per day. 7.65 kWh × $0.17 = $1.30.
  4. Cost per month. $1.30 × 30 days = $39.01.

For an electric water heater the two levers are run-hours (1.7 h/day here) and your rate; used this briefly, even 4,500 W costs little — which is why anything that makes heat dominate the rankings.

Other heating loads: Hot tub ($512/yr), Tankless water heater ($391/yr), Electric furnace ($597/yr). Closest on annual cost: Ductless mini-split ($479/yr), Heat pump ($524/yr). Across all other heating loads here, the cheapest is Air fryer at $1.33/mo.

The an electric 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 an electric water heater ($39.01 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 an electric water heater per hour?

About $0.765 an hour for an electric water heater at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), for a 4,500 W unit. The calculation is 4,500 ÷ 1,000 × 1 hour × $0.17 per kWh. At 30¢/kWh the same hour costs $1.350.

How much does an electric water heater add to my monthly bill?

Roughly $39.01 a month for an electric water heater at 1.7 hours a day, 30 days a month, 17¢/kWh. That is about $475 a year if you use it that much year-round. For an electric water heater, change the 1.7-hour default to your own use — run-time moves the total as much as the 4,500 W does.

How many watts does an electric water heater use?

Typically around 4,500 W, with real units ranging from about 3,800 to 5,500 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 an electric water heater figure?

$39.01 a month is the energy cost of an electric water heater alone; your bill adds fixed connection charges, delivery fees, taxes and every other load. Add the other appliances in the index to an electric water heater for the controllable part of the bill.

How we calculated this

Worked for an electric water heater: 4,500 W ÷ 1,000 × 1.7 h × $0.17 = $1.30 a day; × 30 days = $39.01 a month; × 12 months in use = $475 a year. 4,500 W and 1.7 h are the typical figures cited for an electric 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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