How Much Does a Electric Water Heater Cost to Run?
A electric water heater costs approximately $788/year to run at $0.16/kWh. That is $65.70/month or $0.720/hour.
💰 Electric Water Heater Running Cost Calculator
Based on 4500W rated power. Actual varies by model and usage.
Electric Water Heater Cost at Different Rates
| Rate | Monthly | Annual |
|---|---|---|
| $0.08 | $32.83 | $394 |
| $0.10 | $41.08 | $493 |
| $0.12 | $49.25 | $591 |
| $0.16 | $65.67 | $788 |
| $0.20 | $82.17 | $986 |
| $0.25 | $102.67 | $1,232 |
| $0.30 | $123.17 | $1,478 |
| $0.35 | $143.75 | $1,725 |
Electricity cost to run a Electric Water Heater
A typical Electric Water Heater draws 4,500 watts when running and operates roughly 3 hours per day on average. That works out to 13.50 kWh per day, 411 kWh per month, and approximately 4,928 kWh per year.
At the US-average residential rate of 16.4 cents per kWh (EIA April 2026), the Electric Water Heater costs roughly $788 per year to operate. In cheap-power states like Idaho or Washington at 11 cents, it is closer to $591. In expensive states like California or Massachusetts at 30 cents, it climbs to $1232. In Hawaii at 41 cents per kWh, the annual cost is approximately $2030.
Annual cost by state rate
| Rate scenario | Rate (c/kWh) | Annual kWh | Annual cost |
|---|---|---|---|
| Idaho, Washington (cheapest) | 11.0 | 4,928 | $542 |
| Texas, Florida | 14.0 | 4,928 | $690 |
| US national average | 16.4 | 4,928 | $788 |
| New York, Connecticut | 25.0 | 4,928 | $1232 |
| California, Massachusetts | 30.0 | 4,928 | $1478 |
| Hawaii (most expensive) | 41.2 | 4,928 | $2030 |
Frequently asked questions
How much electricity does a Electric Water Heater use?
A typical Electric Water Heater uses about 13.50 kWh per day running 3 hours at 4,500W. That works out to roughly 411 kWh per month and 4,928 kWh per year. Your actual use will vary with how often you run it.
How much does it cost to run a Electric Water Heater per month?
At US-average electricity rates (16.4 cents/kWh), running the Electric Water Heater costs about $67.40 per month. In low-rate states it can be as little as $45.21; in high-rate states like California, expect closer to $123.30 per month.
What is the annual cost of running a Electric Water Heater?
Annual operating cost at US-average rates: approximately $788 per year. The range across US states is roughly $493 (cheapest) to $2030 (Hawaii).
How can I reduce the cost of my Electric Water Heater?
Check whether your utility offers a time-of-use plan that aligns with this appliance use pattern.
What watt rating should I expect for a Electric Water Heater?
Typical running wattage for a Electric Water Heater is around 4,500 watts. Specific models vary; check the nameplate label on your unit for exact figures. Common variation is plus-or-minus 20 percent of the typical value.
Electric Water Heater Energy Usage Explained
A electric water heater consumes 4500W. At 3 hours/day for 365 days/year, that is 4,928 kWh annually, about 46.9% of average US household usage (10,500 kWh).
How to Calculate Running Cost
Cost = (Watts ÷ 1000) × Hours × Rate
For your electric water heater: (4500W ÷ 1000) × 3 hrs × $0.16/kWh = $2.16/day.
Tips to Reduce Costs
Use time-of-use electricity plans for off-peak rates ($0.05–$0.10/kWh overnight). Upgrade to Energy Star certified models. Use smart plugs or timers. Check rates in your state with our Electricity Cost Calculator.
Disclaimer: Estimates based on rated wattage. Actual consumption varies by model, age, and usage patterns.