Heating · California
How Much Does It Cost to Run an Oil-Filled Radiator in California?
The short answer
Running a 1,500W oil-filled radiator in California costs about $0.35 an hour. At 8 hours a day, that’s roughly $85.88 a month and $1,030 a year.
That’s based on California’s average residential rate of 33.6¢/kWh (EIA, July 2026), 84% above the US average.
Source: U.S. EIA, July 2026 data · Updated
Oil-Filled Radiator cost by daily use in California
| Daily use | kWh/month | Per day | Per month | Per year |
|---|---|---|---|---|
| 1 hour/day | 31.9 | $0.35 | $10.74 | $129 |
| 2 hours/day | 63.9 | $0.71 | $21.47 | $258 |
| 4 hours/day | 127.8 | $1.41 | $42.94 | $515 |
| 8 hours/day | 255.5 | $2.82 | $85.88 | $1,030 |
| 12 hours/day | 383.3 | $4.23 | $129 | $1,546 |
| 24 hours/day | 766.6 | $8.47 | $258 | $3,091 |
California vs other states
At typical use, an oil-filled radiator costs $1,030 a year in California — $441 less than in Hawaii and $640 more than in Louisiana.
California has the 2nd-most-expensive residential electricity of the 50 states and DC. electricity prices in California · all states ranked
Electricity price trend in California
33.6¢/kWh in July 2026 — ▲ +2.9% 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 California?
Running a 1,500W oil-filled radiator for 24 hours uses about 25.2 kWh, which costs about $8.47 at California’s average rate of 33.6¢/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 California that costs $85.88.
Is it expensive to run an oil-filled radiator in California?
California has the 2nd-most-expensive residential electricity of the 50 states and DC at 33.6¢/kWh — one of the most expensive. Running an oil-filled radiator here costs about $1,030 a year at typical use, compared with $561 at the national average rate.
What is the electricity rate in California right now?
The average residential electricity rate in California was 33.6¢ per kWh in July 2026, according to the latest EIA data — up 2.9% 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 California
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).