Watt setting
High is often 1,500 watts, while low or eco modes may draw less or cycle off.
Heating cost
Estimate how much a portable space heater costs to run.
Most portable heaters draw about 1,500 watts on high. The monthly cost depends almost entirely on hours per day, electricity rate, and whether it replaces or adds to your main heating system.
Quick estimates
Short use
1,500 W x 2 h/day$15-$31/mo
Useful for occasional room heating or a short evening schedule.
Daily use
1,500 W x 5 h/day$38-$77/mo
Common winter pattern that can noticeably raise the electric bill.
Heavy use
1,500 W x 10 h/day$77-$154/mo
Worth auditing closely, especially if more than one heater runs.
Hours per day
Runtime is the main difference between a small comfort cost and a high bill.
Room heat loss
Drafts, poor insulation, and open doors make the heater run longer.
Safety and placement
Use heaters only as intended and avoid unsafe setups while trying to save money.
Cost formula
A 1,500 watt heater uses 1.5 kWh each hour.
Multiply 1.5 kWh by hours per day, billing days, and your electricity rate. Five hours per day for 30 days is 225 kWh.
If your bill rose in winter, compare heater hours, electric heat, heat pump backup heat, and billing days before assuming the rate changed.
Useful checks
Tools that can make the estimate more accurate
Smart thermostat
Useful when cooling or heating hours are the biggest part of the electric bill.
LED bulb multipack
A simple upgrade for homes still using older incandescent or halogen bulbs.
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Space heater electricity tools
1500 watt cost calculator
Estimate the cost of a common portable heater wattage.
Open pagePortable space heater cost
Adjust heater watts, hours, rate, and billing days.
Open pageWinter electric bill
Check why electric heating can change winter bills.
Open pageWinter utility bill calculator
Compare heater cost with water, sewer, fixed fees, and billing days.
Open pageElectric bill audit checklist
Review billing days, kWh, rate, fixed fees, and major loads.
Open pageNormal kWh usage
Check whether heater use pushed the month into a high usage band.
Open pageLower electric bill guide
Find the fastest changes after estimating heater cost.
Open pageFAQ
Short answers for search visitors and bill-checking moments.
How much does a 1500 watt space heater cost to run?
A 1,500 watt heater uses 1.5 kWh per hour. At 17 cents per kWh, one hour costs about 26 cents and 5 hours per day is about $39 per 30-day month.
Can a space heater make my electric bill high?
Yes. Resistance heat is power-heavy, and several hours per day can add more to the bill than many small appliances combined.
Is a space heater cheaper than central heat?
It can be cheaper for one occupied room, but expensive if it runs many hours or replaces a more efficient heat pump or gas furnace.