Heating · Washington
How Much Does It Cost to Run an Oil-Filled Radiator in Washington?
The short answer
A typical 1,500W oil-filled radiator costs about $0.15 per hour to run in Washington, or $37.59 a month at 8 hours a day.
That’s based on Washington’s average residential rate of 14.7¢/kWh (EIA, July 2026), 20% below the US average.
Source: U.S. EIA, July 2026 data · Updated
Oil-Filled Radiator cost by daily use in Washington
| Daily use | kWh/month | Per day | Per month | Per year |
|---|---|---|---|---|
| 1 hour/day | 31.9 | $0.15 | $4.70 | $56.38 |
| 2 hours/day | 63.9 | $0.31 | $9.40 | $113 |
| 4 hours/day | 127.8 | $0.62 | $18.79 | $226 |
| 8 hours/day | 255.5 | $1.24 | $37.59 | $451 |
| 12 hours/day | 383.3 | $1.85 | $56.38 | $677 |
| 24 hours/day | 766.6 | $3.71 | $113 | $1,353 |
Washington vs other states
At typical use, an oil-filled radiator costs $451 a year in Washington — $1,021 less than in Hawaii and $61.01 more than in Louisiana.
Washington has the 13th-cheapest residential electricity of the 50 states and DC. electricity prices in Washington · all states ranked
Electricity price trend in Washington
14.7¢/kWh in July 2026 — ▲ +9.4% from a year earlier.
How to lower the cost of running an oil-filled radiator
An oil-filled radiator heats sealed-in oil, which then releases heat slowly through the fins. It is not more efficient than a fan heater — electricity to heat is still about 1:1 — but the stored heat means the thermostat switches the element off for longer stretches once the room is warm. We assume the element is on about 70% of the time, so a 1,500W radiator averages roughly 1.05 kWh per hour of use. Expect the real number to be higher in a cold, drafty room and lower in a well-insulated one.
- Set the thermostat dial to the lowest comfortable setting and let the oil do the work.
- Place it near the coldest wall or under a window, away from furniture that blocks the fins.
- Switch to the lower power setting (600–900W) once the room is up to temperature.
Questions
Frequently asked questions
How much does it cost to run an oil-filled radiator for 24 hours in Washington?
Running a 1,500W oil-filled radiator for 24 hours uses about 25.2 kWh, which costs about $3.71 at Washington’s average rate of 14.7¢/kWh.
How many kWh does an oil-filled radiator use per month?
At 8 hours a day, a typical oil-filled radiator uses about 256 kWh a month. In Washington that costs $37.59.
Is it expensive to run an oil-filled radiator in Washington?
Washington has the 13th-cheapest residential electricity of the 50 states and DC at 14.7¢/kWh — cheaper than most. Running an oil-filled radiator here costs about $451 a year at typical use, compared with $561 at the national average rate.
What is the electricity rate in Washington right now?
The average residential electricity rate in Washington was 14.7¢ per kWh in July 2026, according to the latest EIA data — up 9.4% from a year earlier.
Are oil-filled heaters cheaper to run than fan heaters?
Per watt, no — both convert electricity to heat at about 100%. In practice an oil-filled radiator often uses a little less because its thermostat cycles off for longer once the oil is hot.
Oil-Filled Radiator costs in nearby states
Other appliances in Washington
Cheapest and priciest states
Comparisons
Sources & method
- Electricity rates: U.S. Energy Information Administration, Electric Power Monthly — average residential retail price, July 2026 (latest available). Retrieved .
- CO₂: EIA State Electricity Profiles, 2024 emissions rate of in-state power generation.
- Default usage for oil-filled radiator: 8 hours a day, 70% duty cycle. Typical power 1,500W.
- Formulas, duty cycles and limitations: methodology. Data download: open data (CC BY 4.0).