Electric Water Heater Cost Per Month: July 2026 Data

In WattCost's July 2026 snapshot, the median certified electric water heater uses 1,082 kWh a year. At the April 2026 U.S. average residential price of 18.83¢/kWh, that works out to about $17 a month. This guide covers certified electric heat-pump water heaters; it does not treat a conventional electric-resistance tank as the same product.

Key takeaways

• The median of 566 certified electric models uses 1,082 kWh/year, or about $204/year at 18.83¢/kWh.
• The certified range is 643 to 1,741 kWh/year, which equals roughly $10 to $27 a month at the same rate.
• A water heater's annual kWh is a standardized comparison figure; household hot-water demand and local conditions can produce a different bill.
• Every extra 1¢/kWh in a household's electricity rate adds about $10.82 a year to a 1,082-kWh water heater.

What does an electric heat-pump water heater cost to run?

For this certified-model snapshot, the midpoint is $203.74 per year, or $16.98 per month. The low end is about $121 a year and the high end about $328 a year at the U.S. average rate. Those numbers are electricity-only operating estimates, not purchase, installation, maintenance, or water costs.

The useful comparison is annual kWh, not the wattage stamped on a heating element. A heat-pump water heater moves heat and has a different operating pattern from an electric-resistance tank, so a single wattage figure cannot predict the annual bill.

How the monthly estimate is calculated

WattCost multiplies certified annual electricity use by an electricity price, then divides by 12. For the median: 1,082 kWh/year × $0.1883/kWh = $203.74/year; $203.74 ÷ 12 = $16.98/month. At a 25¢/kWh household rate, the same 1,082-kWh figure becomes about $22.54 a month.

That rate sensitivity matters more than a national average. Use the price per kWh on a utility bill for a closer estimate, then compare models with the same household needs rather than treating the lowest annual kWh as automatically the best fit.

Why your actual water-heater bill can differ

The certified annual-kWh value is based on the DOE Uniform Energy Factor test, which simulates a daily hot-water draw pattern. It is designed to make models comparable. A household's shower, laundry, dishwashing, incoming-water temperature, installed location, and selected operating mode can all differ from that test pattern.

That distinction is especially important for a demand-driven appliance. The label gives a consistent baseline for shopping; a utility bill reflects the amount of hot water a household actually used.

How to compare models without hiding the assumptions

Start with WattCost's certified electric water-heater rankings, then price the annual kWh at the relevant state rate. For an installation question, compare the model's stated storage volume, first-hour rating, electrical requirements, and heat-pump type before treating annual energy use as the whole decision.

For a broader explanation of the data sources and calculation, read the site's methodology.

FAQ

How much does an electric water heater cost per day? The median certified electric heat-pump model in this snapshot works out to about 56¢ per day at 18.83¢/kWh: $203.74 divided by 365. That is an annualized comparison, not a promise that every day will use the same amount of electricity.

Is this estimate for a conventional electric-resistance water heater? No. WattCost's certified electric water-heater dataset contains electric heat-pump models. A conventional resistance tank has a different technology and should not be assigned this article's kWh figure without checking its own EnergyGuide label.

Why is my water-heater bill higher than this? The standardized annual-kWh figure assumes a test draw pattern. More hot-water use, a higher local electricity rate, and conditions different from the test can all raise a household's actual electricity cost.

Does a bigger tank always cost more to run? Not necessarily. Tank size is only one product attribute. Compare the exact model's annual kWh, Uniform Energy Factor, capacity, and first-hour rating instead of assuming a larger tank has a fixed operating-cost penalty.

Data notes & sources

These calculations use WattCost's July 2026 snapshot of 566 certified electric water heaters and the EIA's April 2026 U.S. average residential electricity price of 18.83¢/kWh.

Product and test context: ENERGY STAR water-heater guidance.

Electricity-rate context: U.S. EIA residential electricity-price table.