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Use the calculator for an instant estimate, or read on for a full breakdown of how this cost is calculated.
Examples and calculation text checked September 22, 2026. This is a planning guide, not an individual engineering review.
Illustrative example
$800/year
Declared inputs, not a typical-home range
4,000 kWh/year × $0.20/kWh = $800/year. This is an arithmetic example, not a claim that every electric water heater uses 4,000 kWh.
Where available, start with annual electricity on the specific model's EnergyGuide label. Label results use test conditions; actual demand and installation can differ.
If you do not have annual consumption, the household walkthrough can estimate electric hot-water use from its stated equipment and household assumptions. Keep space heating separate. Gas or propane water heating requires separate fuel costs; small electrical controls do not represent the fuel used to heat the water.
The calculator starts with the same example. Its $66.67 average-month cost is annual cost divided by 12; seasonal bills can look very different. The $0.20/kWh rate is illustrative, not a national average. Use your energy rate; fixed fees and taxes are separate.
The starting values are an example. Replace them with your equipment and usage.
Enter a measured or labeled annual electricity estimate for this heater. A label uses test conditions; your hot-water demand and installation may differ. Gas energy is outside this calculation.
4,000 kWh per year
$800.00 per year
$66.67 per average month (annual cost ÷ 12)
Energy charges only. Fixed fees, taxes, tiered and time-of-use billing are excluded. The average month is not a seasonal forecast.
Annual labeled or measured electricity
Hot-water demand and occupancy
Electric resistance versus heat-pump equipment
Which fuel actually supplies hot water
Before making a change
Check the large loads and uncertain assumptions first. Compare a specific change against your existing equipment before deciding whether an upgrade is worth investigating.
These sources explain units and equipment labels. The worked household values are illustrative inputs, not measured customer data or published typical-use ranges.
Follow the free walkthrough to build a household electricity estimate, review its assumptions and compare changes. The optional $19 purchase unlocks both dated PDF report formats for your household profile.
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