How Much Does It Cost to Run a 240V Garage Heater? $51/Month
Running a 240V garage heater at 5,000 watts for 2 hours a day costs about $1.70 a day and $51.00 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $255 a year.
· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23
On this page: CalculatorTableHow we calculatedSources
Jump to calculator ↓Slider nudges the rate for a 240V garage heater; the URL keeps it.
The same a 240V garage heater at 2 hours a day costs $36.00 a month at 12¢ and $135.00 at 45¢ — usage held constant, only the rate moving:
| Electricity rate | Per hour | Per day | Per month in season | Per year |
|---|---|---|---|---|
| 12¢/kWh | $0.600 | $1.20 | $36.00 | $180 |
| 15¢/kWh | $0.750 | $1.50 | $45.00 | $225 |
| 17¢/kWh (US avg) | $0.850 | $1.70 | $51.00 | $255 |
| 20¢/kWh | $1.000 | $2.00 | $60.00 | $300 |
| 25¢/kWh | $1.250 | $2.50 | $75.00 | $375 |
| 30¢/kWh | $1.500 | $3.00 | $90.00 | $450 |
| 35¢/kWh | $1.750 | $3.50 | $105.00 | $525 |
| 45¢/kWh | $2.250 | $4.50 | $135.00 | $675 |
- Typical power draw
- 5,000 W (3,000–7,500 W)
- Assumed use
- 2 h/day, 30 days/month
- Energy per day
- 10.00 kWh
- Cost per day
- $1.70
- Cost per month
- $51.00
- Cost per year
- $255
Why this number
A 240V garage heater rated at 5,000 watts, run 2 hours a day, costs about $1.70 a day — about $51.00 a month, or $255 a year — at the US average electricity rate of 17¢/kWh. That places it 9th of the 40 appliances tracked here — in the top quarter, well above the typical household load, so how much you run it genuinely shows on the bill.
What actually drives this number
Hard-wired 240 V heaters draw several times what a plug-in unit can, because a standard 120 V outlet physically limits a portable heater to about 1,500 W. That ceiling is why one portable heater cannot heat a garage, and why the fix costs real money to run. Costed over a five-month heating season.
At 5,000 W every hour of this load costs about $0.85 and no more efficient unit exists to buy — resistance heat is resistance heat. The same physics is why, at whole-house scale, the real decisions are between technologies rather than models: the heat pump vs gas furnace running-cost comparison works out when moving heat beats making it, and the winter heating fuel comparison prices electric resistance against gas, propane and oil per unit of heat actually delivered.
Where this number comes from
- Benchmark: 1,500 kWh/year — the 5,000 W rating matches the Fahrenheat FUH garage heater spec
- Assumed use for a 240V garage heater: 2 h/day, 30 days/month, 5 months/year — every one of these is editable in the calculator above
- Rate for a 240V garage heater: 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), from EIA Electric Power Monthly, Table 5.6.A ; the state selector above fills in yours
Putting 240V garage heater in proportion
At 17¢/kWh, a 240V garage heater next to the rest of the bill:
- 240V garage heater at $51.00 a month is close to Hot tub at $42.08, and just under Central air conditioner at $67.83
- One hour of a 240V garage heater uses as much as 83 hours of a 60 W Wi-Fi router
- Over a year a 240V garage heater comes to $255 — about 1.7 months of a $150 monthly electricity bill
For a 240V garage heater: making heat is where household electricity goes, but how it is made decides the bill. A resistance element — an oven, a dryer, a resistance furnace, a kettle — converts every watt into exactly one watt of heat, so a cheap appliance and an expensive one with the same rating cost the same to run and efficiency is not something you can shop for. Equipment that moves heat instead of making it, like a heat pump, delivers several units of heat per unit of electricity and breaks that rule entirely. The only levers on a resistance load are running it less, running it lower, or heating a smaller space. On this site’s own numbers, a 240V garage heater lands at #9 of 40 on the monthly-cost ranking, at about $51.00 for a typical month.
The formula, in full
The 5,000 W arithmetic for a 240V garage heater, step by step:
- Watts to kilowatts. 5,000 W ÷ 1,000 = 5.00 kW.
- Energy per day. 5.00 kW × 2 hours = 10.00 kWh.
- Cost per day. 10.00 kWh × $0.17 = $1.70.
- Cost per month. $1.70 × 30 days = $51.00.
For a 240V garage heater the two levers are run-hours (2 h/day here) and your rate; used this briefly, even 5,000 W costs little — which is why anything that makes heat dominate the rankings.
Related
Other heating loads: Space heater ($191/yr), Home sauna (electric) ($186/yr), Tankless water heater ($391/yr). Closest on annual cost: Portable air conditioner ($233/yr), Golf cart (48V charging) ($223/yr). Across all other heating loads here, the cheapest is Air fryer at $1.33/mo and the priciest is Electric furnace at $119.34/mo.
The a 240V garage heater table above runs a fixed rate ladder (12–45¢); the state quick-fill uses July 2026 averages from EIA Electric Power Monthly, Table 5.6.A .
Put a 240V garage heater ($51.00 a month) against everything else in the electricity cost calculator , check your state’s rate , or browse all 40 appliances ; year-round high bills: solar savings calculator .
Frequently asked questions
How much does it cost to run a 240V garage heater per hour?
About $0.850 an hour for a 240V garage heater at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), for a 5,000 W unit. The calculation is 5,000 ÷ 1,000 × 1 hour × $0.17 per kWh. At 30¢/kWh the same hour costs $1.500.
How much does a 240V garage heater add to my monthly bill?
Roughly $51.00 a month for a 240V garage heater at 2 hours a day, 30 days a month, 17¢/kWh. That is about $255 a year across a 5-month season. For a 240V garage heater, change the 2-hour default to your own use — run-time moves the total as much as the 5,000 W does.
How many watts does a 240V garage heater use?
Typically around 5,000 W, with real units ranging from about 3,000 to 7,500 W depending on size, model and setting. The nameplate on your own unit is the figure to trust — these are typical values for planning, not a measurement of your appliance.
Why is my actual bill higher than the a 240V garage heater figure?
$51.00 a month is the energy cost of a 240V garage heater alone; your bill adds fixed connection charges, delivery fees, taxes and every other load. Add the other appliances in the index to a 240V garage heater for the controllable part of the bill.
How we calculated this
Worked for a 240V garage heater: 5,000 W ÷ 1,000 × 2 h × $0.17 = $1.70 a day; × 30 days = $51.00 a month; × 5 months in use = $255 a year. 5,000 W and 2 h are the typical figures cited for a 240V garage heater; 17¢ is EIA’s 2025 annual US average.Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.
Where to go next
- Cost to run hot tub — The next cheaper item on the list: $42.08 a month against a 240V garage heater’s $51.00.
- Cost to run central air conditioner — The next pricier item: $67.83 a month, which puts a 240V garage heater in proportion.
- All 40 appliances ranked by monthly cost — 240V garage heater is 9 of 40; the full ranking at 17¢/kWh.
- Electricity cost calculator — Any wattage and hours, not just a 240V garage heater — with the state quick-fill.
- Find your electricity rate by ZIP — Your own utility’s average rate, sent straight into the a 240V garage heater calculator.