Water Heating · West
Cost to run a electric water heater in Oregon
At Oregon’s average residential rate of 15.92¢ per kWh, a electric water heater drawing 4000W for 3 hours a day, at a 45% duty cycle, costs about $26.17 per 30.44 use days. Change the numbers below to match how you actually use yours.
Electric Water Heater electricity cost calculator
Use watts and running time, or enter energy from a label, meter or completed load. Your inputs stay on this device.
Enter a number within each field’s limits to calculate your cost.
Your estimated energy cost
1,971 kWh across 365 use days per year
Power mode includes your selected duty cycle. The monthly figure assumes 30.44 use days; the annual total uses your selected use days. These are estimates at the entered rate.
Energy charges only. Fixed utility fees, purchase, installation and maintenance are excluded. See the calculation method and sources.
Why the cost differs in Oregon
Oregon has the 23rd cheapest residential electricity of the 50 US states and Washington, DC we track, at 15.92¢ per kWh against a national average of 18.16¢. That is -12.3% compared with the national figure. Oregon's Columbia River hydroelectric generation keeps rates low, with drought years the main risk to that position since low reservoirs force replacement power purchases. Retail service is largely regulated. The climate is unusually mild by national standards: cooling load west of the Cascades is genuinely small, though rising summer extremes are changing that.
For this appliance specifically, the difference works out to a saving of $44.15 a year against what the same electric water heater would cost at the national average rate. Run the identical appliance in Hawaii and it would cost $930 a year; in Nevada it would cost $251. That spread of $679 is entirely down to location.
Reducing use by 100 kWh would save $15.92 in energy charges at Oregon's average rate, compared with $18.16 at the US average. Whether a replacement appliance pays for itself also depends on its purchase price and the energy it actually saves.
Use the energy and delivery price that applies to your own utility plan in Oregon. If your plan has time-of-use prices, calculate each period separately or use a rate weighted by the electricity used in each period. Fixed monthly fees are outside this appliance energy-cost estimate.
| Location | Rate | Per month | Per year |
|---|---|---|---|
| Oregon this page | 15.92¢ | $26.17 | $314 |
| US average | 18.16¢ | $29.85 | $358 |
| Nevada cheapest state | 12.72¢ | $20.91 | $251 |
| Hawaii most expensive | 47.18¢ | $77.55 | $930 |
Oregon electricity rate trend
Rates in Oregon have moved from 16.04¢ to 15.92¢ per kWh between September 2025 and August 2026. The national residential average changed +3.4% from the same month a year earlier.
2025-09 to 2026-08 · cents per kWh
About running a electric water heater
Typically the second-largest load in a home after heating and cooling. Tank models reheat continuously to counter standby loss; heat pump water heaters cut consumption by roughly two-thirds.
How we worked this out
The arithmetic is simple and we would rather show it than hide it. Divide watts by 1,000 to get kilowatts, multiply by hours of use and by the duty cycle to get kilowatt-hours, then multiply by your rate:
4000W ÷ 1000 × 3h × 45% = 5.400 kWh/day × 15.92¢ = $0.860 per day
One honest caveat: Oregon’s figure is a state average published by the EIA. Your own utility’s tariff, any time-of-use pricing, fixed monthly service charges and local taxes all shift the real number. Put your actual per-kWh rate into the calculator above for a figure that reflects your bill.
How to estimate your electric water heater electricity use
A storage water heater draws high power while reheating, but its elements do not necessarily run all day. Hot-water demand, inlet temperature, insulation and settings affect electricity use. Annual EnergyGuide kWh or measured energy can be more useful than element wattage alone.
This estimate covers electricity only. Water, sewer, equipment purchase and installation are separate. A preset does not determine your household hot-water use.
- Use the total input of elements that operate at the same time. Do not automatically add both element ratings; check the model wiring and operating specification.
- For an EnergyGuide label with annual kWh, multiply that energy by your local price in dollars per kWh. The result retains the label test assumptions.
- If using element watts, choose the total time actively heating or use an appropriate duty factor over a longer period. Do not count the same cycling reduction twice.
- A heat-pump water heater has different input and operating modes from a resistance tank. Its backup elements can change consumption.
Calculation and data sources
Daily kWh = watts ÷ 1,000 × hours × duty cycle ÷ 100. Multiply kWh by your rate in dollars per kWh to get cost. The wattage, hours and duty cycle above are editable example assumptions, not EIA measurements of this appliance.
The US and state average prices come from the EIA for August 2026. A state average is a starting point; your bill is the better source for your tariff.
Questions about electric water heater running costs
How much electricity does a electric water heater use?
In this example, 4000 watts at a 45% duty cycle uses 1.800 kWh per scheduled hour. At 3.00 hours per day, that is 5.400 kWh per use day. Your model and operating conditions can differ.
How much does it cost to run a electric water heater for an hour?
The default example costs $0.287 per scheduled hour at the Oregon average of 15.92¢/kWh for August 2026. This includes the selected duty cycle. Enter your watts, duty cycle and electricity price for your own estimate.
Does the annual cost assume I use it every day?
The reference tables use 365 days at the stated daily hours; monthly figures use 30.44 days. These are comparison scenarios, not forecasts. For a heater used on 90 days, enter 90 use days per year in the calculator.
Why does electricity running cost vary by state?
For August 2026, the EIA state averages range from 12.72¢/kWh in Nevada to 47.18¢/kWh in Hawaii. Equal electricity use costs more at a higher rate. Your utility tariff can differ from the state average.
Does a 4,500W water heater use that much power all day?
The rating describes power while the relevant element is active, not necessarily its 24-hour average. Use actual heating time or a representative energy measurement.
How do I use annual kWh from the yellow EnergyGuide label?
Multiply annual kWh by your local electricity price in dollars per kWh. For example, 2000 kWh at an illustrative $0.20/kWh is $400 per year under the label test assumptions.
Does this include buying a new water heater?
No. This is an electricity running-cost estimate. Equipment, installation, maintenance, water and sewer charges are not included.