Appliances · Updated May 2026

Space heater electricity cost in 2026: what 1,500 W really costs.

Q: How much does a 1,500W space heater cost to run?

At the US-average $0.175/kWh: $0.26 per hour. 8 hours/day for 90 days of winter = $190. Running 24/7 for the same period = $570.

Q: Are oil-filled heaters cheaper than ceramic?

No — they consume the same kWh per hour at the same wattage setting. The myth comes from the thermal mass: oil-filled radiators stay warm after the element shuts off, so they cycle off more often. Real-world savings: 5-10% in a steady-state room.

Q: Is a heat pump cheaper than a space heater?

Roughly 3× cheaper. A mini-split heat pump delivers 3 kWh of heat per kWh of electricity (HSPF ~10 = COP ~3). A space heater delivers 1 kWh of heat per kWh of electricity. A space heater running 4 hours/day at $0.26/hr = $1.04/day. Mini-split for same heat output: $0.35/day.

A "cheap space heater for the office" is one of the most reliable ways to silently triple your December electricity bill. Here is the real cost-per-hour of every common type — and the math that explains why a $400 used mini-split beats every $50 portable on operating cost.

TL;DR: All 1,500 W electric space heaters cost $0.26/hour at the US-average rate, regardless of "infrared", "ceramic" or "oil-filled" marketing. Running 8 hr/day for a 90-day winter: $190. A mini-split heat pump delivers the same heat for $63. The cheap heater is the expensive choice.

Cost per hour by heater type — all at full power

Type	Power	$/hour @ $0.175	$/winter (8 hr × 90 d)
Ceramic / fan-forced	1,500 W	$0.26	$189
Oil-filled radiator	1,500 W	$0.26	$170 (10% cycling discount)
Infrared / quartz halogen	1,500 W	$0.26	$189
Convection (panel / baseboard)	1,500 W	$0.26	$189
Propane Mr. Heater Big Buddy	9,000 BTU	$0.50 (propane)	$360
12k BTU mini-split (HSPF 10)	~400 W avg	$0.07	$50-$63

The "ceramic vs oil-filled" myth, settled

Every $20 ceramic heater puts out exactly the same heat per kWh as every $200 oil-filled radiator. Both are 100% efficient at converting electricity to heat (the laws of thermodynamics demand it — there's nowhere else for the energy to go). The differences are secondary:

Heat distribution. Ceramic with fan: faster room warm-up, more uneven temperature gradient. Oil-filled: slower, more even.
Thermal mass. Oil-filled retains heat after the element shuts off — cycles a few minutes off per cycle. Real savings: 5-10%.
Sound. Ceramic with fan ~45 dB. Oil-filled silent.
Safety. Oil-filled surface is hotter than ceramic but less likely to cause fabric ignition. Both must be on tip-over auto-shutoff in 2026.

When a space heater actually makes sense

Heating one room while keeping the rest cooler. If your central thermostat is in the kitchen but you sit in the basement office, a 750 W space heater set on low (using ~400 W) for 4 hours = $0.07/hr × 4 = $0.28/day, vs running central heat to warm the whole house = $4-$8/day. Net savings: $3-$7/day.
Short-duration use (under 2 hours). The installation friction of a permanent solution doesn't pencil.
Renting with no heat source. Mini-splits require landlord buy-in.
Emergency backup during a furnace failure. Worth keeping one $40 ceramic on hand.

Frequently asked questions

How much does a 1,500W space heater cost to run?

$0.26/hour at US-average rates. 8 hours/day × 90 days = $190.

Are oil-filled heaters cheaper than ceramic?

No — same kWh per hour. Oil-filled cycles 5-10% more efficiently due to thermal mass, but not the radical difference advertised.

Is a heat pump cheaper than a space heater?

~3× cheaper. Mini-split COP ~3 means 1 kWh in = 3 kWh of heat. Space heater = 1 kWh in, 1 kWh of heat.

Sources: EIA average retail prices May 2026, NREL ResStock model defaults, Consumer Reports portable heater testing 2025, ENERGY STAR mini-split COP database. Last reviewed May 12, 2026.