FAQSpace heater electricity cost questions
Practical answers about wattage, thermostat cycling, heater types, utility rates, and safe use.
How much does a space heater cost to run per hour?
A 1,500-watt heater uses 1.5 kWh for every full hour its heating element runs. At 18.83 cents per kWh, that is about $0.28 per active heating hour. A thermostat that cycles the element off can lower the average cost per scheduled hour.
How much does a 1,500-watt space heater cost per month?
At 18.83 cents per kWh, a 1,500-watt heater running at full power for 4 hours a day and 30 days costs about $33.89 per month. If the element heats only half the scheduled time, the estimate falls to about $16.95.
How much electricity does a 1,500-watt heater use?
A 1,500-watt heater uses 1.5 kWh for each hour the heating element is active. Four full-power hours use 6 kWh, while four scheduled hours at a 50% thermostat duty cycle use about 3 kWh.
Does the low setting on a space heater use less electricity?
Yes, while the element is running. A 750-watt low setting uses half the power of a 1,500-watt high setting. However, low may need to run longer to reach or maintain the same room temperature, so the final savings may be less than 50%.
How does thermostat cycling change space-heater cost?
Thermostat cycling reduces active heating time. A 50% on-time means the element heats for roughly half of the scheduled period, cutting modeled electricity use in half compared with continuous full-power operation. Actual cycling varies with the room, weather, setpoint, and heater.
Are oil-filled, ceramic, and infrared heaters cheaper to run?
At the same wattage and active runtime, electric resistance heaters cost essentially the same to operate. Heater type changes how warmth is delivered and may affect comfort or thermostat cycling, but it does not make 1,500 watts consume fewer than 1.5 kWh per active hour.
Do two space heaters double the electricity cost?
If both heaters have the same wattage and follow the same schedule, two heaters use twice the electricity and cost twice as much as one. Do not assume multiple heaters can safely share an outlet or circuit; follow each manufacturer’s instructions.
Which electricity rate should I use from my bill?
Use the variable price charged for each kWh. If your bill lists supply or generation and delivery or distribution as separate per-kWh charges, add them together. Do not assign fixed customer charges to the heater because those do not change with its usage.
Is a space heater cheaper than central heating?
It can be cheaper when it heats one occupied room and lets you reduce whole-home heating. It is not automatically cheaper if the central system keeps running normally or if several rooms need separate heaters. Fuel price, system efficiency, heat-pump performance, and home heat loss all affect the comparison.
Is it safe to leave a space heater on overnight?
The U.S. Consumer Product Safety Commission advises never leaving a portable heater running while sleeping. Plug it directly into a wall outlet, keep it at least three feet from combustible materials, and follow the manufacturer’s placement and operating instructions.