How Many Watts Does an Electric Water Heater Use?

Answer
4,500 W typical (3,000–5,500 W)

An electric water heater uses about 4,500 watts while running. At a typical 3 hours a day that is 405.0 kWh per month, or about $68.85 at $0.17/kWh. A typical 50-gallon tank has two 4,500 W elements that run one at a time.

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    For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer

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    Electric Water Heater power use at a glance

    Value
    Typical running watts4,500 W
    Range3,000–5,500 W
    Current at 120 V37.5 A
    Typical use3 h per day
    Energy per day13.50 kWh
    Energy per month405.0 kWh
    Cost per month ($0.17/kWh)$68.85
    Cost per year$838

    Check the label on your appliance for its exact rating. The calculator above uses your own watts, hours and electricity rate.

    Frequently asked questions

    Can I run an electric water heater on a generator?

    Yes. Choose a generator whose running watts exceed 4,500 W.

    How many amps does an electric water heater draw?

    About 37.5 A at 120 V, or 18.8 A on 240 V.

    Open the full calculator: Electricity Cost Calculator →