How Much Does a Space Heater Cost per Hour? (2026 Data)

A 1,500-watt space heater costs about 28¢ per hour at the April 2026 U.S. average residential electricity price of 18.83¢/kWh. At full power, it uses 1.5 kWh in one hour; the cost is an estimate because a heater's setting and runtime, not a certified annual kWh label, determine the bill.

Key takeaways

• 1,500 watts equals 1.5 kWh for each full hour of operation.
• 1.5 kWh × 18.83¢/kWh = about 28¢ per hour.
• At six hours a day, that estimate becomes about $51 a month at the same rate.
• A 750-watt setting costs roughly half as much per full hour, but may need to run longer to maintain comfort.

What does a 1,500-watt space heater cost to run?

At full output, a 1,500-watt space heater costs about 28¢ for each hour it actually draws 1,500 watts at the cited U.S. average rate. The useful word is actually: thermostatic cycling, the selected setting, the room's heat loss, and the heater's runtime all change the result. The calculation is a transparent wattage estimate, not a certified per-model measurement.

How the calculation works

Convert watts to kilowatts, then multiply by time and price: 1,500 W ÷ 1,000 = 1.5 kW; 1.5 kW × 1 hour = 1.5 kWh; 1.5 kWh × $0.1883 = about $0.28. Six full-power hours a day would be 9 kWh a day before any thermostat cycling.

The site uses the same transparent calculation in its methodology.

What changes a space heater's hourly cost?

Power setting and runtime are decisive. A 750-watt setting uses 0.75 kWh per full hour, while a 1,000-watt setting uses 1 kWh. A thermostat can reduce average use by cycling the heating element, but it cannot make 1,500 watts cost less during an hour when the element runs continuously.

How to get a more useful number

Read the heater's wattage label, choose the hours it really runs, and use your own electricity rate. Do not infer lower operating cost from marketing phrases such as '100% efficient': resistance space heaters convert electricity to heat, while the bill still follows watts times hours.

Start with WattCost's space-heater calculator.

For the related buying decision, see the guide to why space heaters, fans, and pool pumps use wattage estimates.

FAQ

How much does a space heater cost for eight hours? A 1,500-watt heater running at full power for eight hours uses 12 kWh. At 18.83¢/kWh, that is about $2.26 for that day; thermostat cycling or a lower setting can reduce the actual total.

Is a 750-watt heater half the cost of a 1,500-watt heater? For the same full-power runtime and electricity rate, yes: it uses half the kWh per hour. It may need to operate for longer in the same room, so compare total hours rather than wattage alone.

Does an eco mode make a space heater cheap to run? An eco mode can reduce average energy by lowering output or cycling the heater, but the electricity cost still equals the kWh used times your rate. Check the actual wattage and runtime.

Why is this not certified ENERGY STAR data? ENERGY STAR does not provide the per-model annual-kWh dataset WattCost uses for certified appliances such as refrigerators. The calculator therefore labels space-heater results as wattage-based estimates.

Data notes & sources

This estimate uses a 1,500-watt full-power example from WattCost's calculator and EIA's April 2026 U.S. average residential price. It excludes any effect on whole-home heating equipment.

Product-test context: U.S. EIA April 2026 residential electricity-price table.

Electricity-rate context: U.S. EIA April 2026 residential electricity-price table.