Electric Water Heater Cost Calculator

Calculate monthly and annual electricity costs for electric-resistance water heaters using element wattage ratings, active daily heating hours, and local state utility rates.

Illustrative Electric Water Heater Benchmarks

Estimated Electric Water Heater Cost

Monthly Cost

$66.83

405.0 kWh / month

Annual Cost

$813.04

4928 kWh / year

Daily Cost

$2.23

13.50 kWh / day

Total Heating Power

4500 W

Standard single active element

Formula: kWh = (Watts × Active Hours/Day × Days) / 1,000 | Rate used: 16.50¢/kWh

Understanding Electric Resistance Tank Water Heater Costs

Standard electric tank water heaters feature upper and lower heating elements (usually 3,500W to 5,500W). Standard thermostat wiring energizes only one element at a time to maintain water temperature and recover after hot water draws.

Water Heater Energy Formula:Daily kWh = (Element Watts × Active Elements × Active Hours/Day) ÷ 1,000Monthly Cost ($) = (Daily kWh × 30) × (Rate ¢/kWh ÷ 100)

Technology Notice & Data Sources

This calculator models electric-resistance tank water heaters. Hybrid heat-pump water heaters use refrigeration technology to achieve 3x to 4x higher efficiency. State rate data is provided via U.S. EIA monthly residential benchmarks.

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