Is it safe to leave a space heater on overnight?

No. The CPSC says "Turn off heaters when sleeping," and the U.S. Fire Administration says to turn them off when you go to bed. Warm the room before bed, then switch it off, or use one with a timer so it turns itself off. An oil-filled radiator stays warm for a while after it is off.

What size space heater do I need?

Plan on 10 watts per square foot in an insulated room (Dimplex's rule). One 1,500 W plug-in heater warms about 150 sq ft. Bigger room claims on a listing do not mean more heat: every plug-in heater tops out at the same 1,500 W.

Which space heater is cheapest to run?

None. Every 1,500 W heater turns the same power into the same heat, so it costs about $0.27 an hour on high at the U.S. average price. A thermostat that switches it off and fewer hours of use are what lower the bill. Our cost page shows the price in your state.

Can I use a space heater in a bathroom?

Only one made for bathrooms, with a shock-guard plug (ALCI or GFCI). The CPSC says most electric heaters have no protection if they get wet and should not be used in bathrooms. Keep it away from the tub and sink.

What size heater do I need for a 2-car garage?

About 4,000 to 5,000 watts for 400 to 500 sq ft, and more if the garage has no insulation. That means a 240 V heater on its own circuit, put in by an electrician. A 120 V plug-in heater is too small.

Are infrared or oil-filled heaters more efficient?

No. At the same watts, every electric heater makes the same heat. They differ in how they deliver it: infrared warms what is in front of it, and oil-filled is silent and stays warm after you switch it off. Claims that one type saves money are the maker's, not a test.

Can I plug a space heater into an extension cord or power strip?

No. The CPSC says to plug space heaters directly into a wall outlet, never into an extension cord or power strip.

Best Space Heater (2026): Safe Picks for Bedroom, Bathroom and Garage

For most rooms, buy the Dreo Atom 316 (HSH006) ceramic heater. It has every safety feature the CPSC and DOE ask for, and at 34 dB it is the quietest we found. Every plug-in heater tops out at 1,500 watts, so they all make the same heat and cost the same to run.

Best for most rooms

Dreo Atom 316 (HSH006) ceramic heater

$35.96 on Amazon

Check price on Amazon

Its listing states tip-over and overheat shutoff, a thermostat and an ETL safety mark.
Quietest of the 10 heaters here that state a noise level: 34 dB.
A timer, so it can switch itself off after you fall asleep.
Sold and shipped by Amazon.

The heaters ChatGPT and review sites recommend, checked

Asked for the best space heater, ChatGPT names these models. Here is what each one's own Amazon listing states about the safety features the CPSC and DOE ask for. Every 1,500 W heater makes the same heat and costs about $0.27 an hour on high. A heater that fails our safety screen is not one of our picks.

ChatGPT: best budget pick

Dreo Atom 316 (HSH006) · 1,500 W · ETL mark · 34 dB · passes our safety screen

Passes our safety screen.

$39.99 on Amazon
ChatGPT: best for a quiet bedroom or office

Vornado TAVH10 (2026) · ETL mark

Its listing states "tip-over protection, and 2-stage automatic safety shut-off" and "ETL certified". It does not say the shut-off covers overheating.

$129.99 on Amazon
ChatGPT: best for all-around warmth on a budget

Honeywell HHF370B 360° Surround · no safety mark stated

Its listing states "a 360-degree tip-over switch, overheat protection" and an adjustable thermostat. It names no UL, ETL or CSA mark.

$54.99 on Amazon
ChatGPT: best for silent, fan-free heat

De'Longhi Dragon Digital (TRD40615E) · 1,500 W · no safety mark stated

Its listing states "a thermal cut-off function that turns off the machine in case of overheating" and a child lock. It names no tip-over switch and no UL, ETL or CSA mark.

$189.95 on Amazon
ChatGPT: best for whole-room warmth

Dreo Whole Room Heater (HSH034) · 1,500 W · ETL mark · 34 dB · passes our safety screen

Its listing states "overheat shutoff, tip-over protection, and flame-retardant housing" and that it is "ETL-listed". It holds a set temperature from 41 to 95°F in 1°F steps.

$89.95 on Amazon

Models from ChatGPT's answers to "best space heater," asked October 24, 2026. Safety facts are each Amazon listing's own words.

Which one is right for you?

For a bedroom
Amazon Basics CY62RR-7 oil-filled radiator · 1,500 W · ETL mark · tip-over and overheat shutoff
No fan, so no fan noise, and it stays warm for a while after you switch it off. Warm the room before bed, then turn it off: the CPSC says to turn heaters off when you sleep.
$70.19 on Amazon
For a bathroom
Dreo HSH003A bathroom heater · 1,500 W · ETL mark · tip-over and overheat shutoff · 34 dB
Its plug has a shock guard (ALCI), made to cut the power if current leaks, as it can when water gets in. The CPSC says most heaters have no such protection and should not be used in bathrooms.
$84.99 on Amazon
For a small room or under a desk
Comfort Zone FH101 fan heater · 1,500 W · ETL mark · tip-over and overheat shutoff
The cheapest heater here with every safety feature and a safety mark. It makes the same 1,500 W of heat as the big towers.
$24.67 on Amazon
For a large or open room
Two Dreo Atom 316 (HSH006) ceramic heaters · 1,500 W · ETL mark · tip-over and overheat shutoff · 34 dB
No plug-in heater makes more than 1,500 W, enough for about 150 sq ft. For a bigger room, run two, each on a different circuit.
$35.96 each on Amazon
For a 2-car garage
A 240 V garage heater · 4,000 to 5,000 W on its own circuit
A plug-in heater is too small for a garage. Our garage page compares electric and propane heaters by garage size.
See garage heater picks
Cheapest to run
Any 1,500 W heater · about $0.27 an hour on high
Every 1,500 W heater turns the same power into the same heat. What saves money is a thermostat that switches it off, and heating fewer hours.
See the cost in your state

Prices are Amazon's on November 4, 2026. Every pick is sold by Amazon and names a UL, ETL or CSA mark in its listing.

By Erin Rose · Updated November 4, 2026

01 / Safety

Before you plug it in: the safety rules

Every pick on this page has a thermostat, tip-over and overheat shutoff, and a UL, ETL or CSA mark in its listing. How you use it matters just as much. These are the rules from the U.S. Consumer Product Safety Commission (CPSC), the Department of Energy (DOE) and the U.S. Fire Administration.

Plug it straight into a wall outlet. “Plug electric space heaters directly into a wall outlet—never into an extension cord or power strip.” (CPSC)
Keep it 3 feet from anything that can burn. “Keep portable heaters at least three feet away from drapes, furniture, bedding and other combustible materials” (CPSC)
Turn it off when you sleep or leave the room. “Turn off heaters when sleeping.” (CPSC) “Turn space heaters off when leaving the room or going to bed.” (U.S. Fire Administration)
Buy one with a safety mark from a testing lab. “certified by a nationally recognized testing laboratory” (CPSC) “Make sure the heater carries the Underwriter's Laboratory (UL) label.” (DOE)
Buy one that shuts off if it tips over. “Buy a unit with a tip-over safety switch, which automatically shuts off the heater if the unit is tipped over.” (DOE)
In a bathroom, only use one made for it. “most electric heaters do not have protection against electrocution should the appliance come in contact with water.” (CPSC)

The CPSC counts about 1,600 fires, 70 deaths and 150 injuries a year from portable heaters (2020 to 2022).^[1]

02 / Heat and cost

How much heat you get, and what it costs

Any heater that plugs into a normal outlet uses at most 1,500 watts. That makes 5,118 Btu of heat an hour (EIA: 1 kWh = 3,412 Btu). The priciest heater in our table makes no more heat than the cheapest one.^[7]

Heater maker Dimplex plans on 10 watts per square foot in an insulated room. So one 1,500 W heater warms about 150 sq ft. Yet the 6 heaters here that state a room size claim 162 to 300 sq ft for the same heat. A cold or drafty room needs more; a room your furnace already warms needs less.^[6]

Room size each listing claims for the same 1,500 W of heat

Dimplex's rule for 1,500 W: about 150 sq ft150
G-Ocean GHOH1502MB oil-filled radiator162
Shinic FP218-15S ceramic heater200
GiveBest PTC910EO ceramic heater200
GiveBest UPH300M fan heater200
Dreo HSH014 fan heater250
Costway NSC-150-7A2R oil-filled radiator300

Square feet. Every heater here makes the same 1,500 W of heat.

Oil-filled, ceramic or infrared: all turn the same power into the same heat. An oil-filled radiator has no fan, so it is silent and stays warm after you switch it off, but it is slow to warm up. A ceramic fan heater warms a room fast. An infrared heater warms the people and things in front of it.

Cost: at the U.S. average home price of 18.19¢ per kWh (EIA, year to date through July 2026), 1,500 W costs about $0.27 an hour on high, or $2.18 for 8 hours. Prices differ a lot by state.^[8] See the cost in your state.

03 / Garage

Heating a garage: what 240 V needs

A heater that can warm a garage runs on 240 volts, like a clothes dryer. A 1,500 W plug-in heater only takes the chill off the spot in front of it.

Size it. A 2-car garage is about 400 to 500 sq ft (20 × 20 to 22 × 22 ft). At 10 watts per square foot, that is 4,000 to 5,000 W, or 13,648 to 17,060 Btu an hour. A garage with no insulation needs more. The makers of the 240 V heaters here that state a room size plan on about 10 watts per square foot.^[6]

Plan the circuit. Amps = watts ÷ volts, so a 5,000 W heater draws about 20.8 amps at 240 V. It needs its own 240 V circuit. A hardwired heater has no plug; an electrician wires it to the breaker. A plug-in one needs a matching 240 V outlet, such as the 30-amp outlet the Dr. Infrared DR-988 listing asks for.

Hire an electrician unless you wire 240 V circuits yourself. Mount it high and aim it at where you work, and keep 3 feet clear of anything that can burn.

04 / Every one in stock

All 35 in-stock heaters that pass our safety screen

All 35 in-stock heaters that pass our safety screen: type, watts, noise, safety mark and Amazon price
Heater	Type	Watts	Noise	Safety mark	Price	Buy
Plug-in heaters: 120 V, 1,500 W, every safety feature
Shinic FP218-15S ceramic heater	Ceramic fan	1,500	42 dB	ETL	$21.99	Buy
Comfort Zone FH101 fan heatersold by Amazon	Fan heater	1,500	—	ETL	$24.67	Buy
Vocrs PTC-903B ceramic heater	Ceramic fan	1,500	—	ETL	$27.99	Buy
Winhl PTC-150A ceramic heater	Ceramic fan	1,500	—	ETL	$29.96	Buy
Dreo Atom 316 (HSH006) ceramic heatersold by Amazon	Ceramic fan	1,500	34 dB	ETL	$35.96	Buy
Lasko CD09101 ceramic heatersold by Amazon	Ceramic fan	1,500	—	ETL	$38.27	Buy
Winhl PTC-SL1703 fan heater	Fan heater	1,500	—	ETL	$39.96	Buy
Reaks PTC916 bathroom heater	Ceramic fan · ALCI plug	1,500	—	ETL	$39.99	Buy
Jibufi PTC-SL1702 fan heater	Fan heater	1,500	—	ETL	$39.99	Buy
Beyond Heat fan heater	Fan heater	1,500	—	ETL	$39.99	Buy
Lasko 754201 ceramic heatersold by Amazon	Ceramic fan	1,500	—	ETL	$39.99	Buy
GiveBest PTC910EO ceramic heater	Ceramic fan	1,500	—	ETL	$39.99	Buy
Dreo HSH004 ceramic heatersold by Amazon	Ceramic fan	1,500	37.5 dB	ETL	$44.93	Buy
Vocrs PTC-SL2402 ceramic heater	Ceramic fan	1,500	32 dB	ETL	$49.94	Buy
Dreo HSH020 fan heatersold by Amazon	Fan heater	1,500	34 dB	ETL	$49.99	Buy
G-Ocean GHOH1502MB oil-filled radiator	Oil-filled radiator	1,500	—	ETL	$52.99	Buy
Aubkn PTC-SL2403 ceramic heater	Ceramic fan	1,500	—	ETL	$54.99	Buy
Dreo HSH003 fan heatersold by Amazon	Fan heater	1,500	34 dB	ETL	$67.45	Buy
Dreo HSH019 fan heatersold by Amazon	Fan heater	1,500	34 dB	ETL	$69.99	Buy
Dreo HSH014 fan heatersold by Amazon	Fan heater	1,500	34 dB	ETL	$69.99	Buy
Amazon Basics CY62RR-7 oil-filled radiatorsold by Amazon	Oil-filled radiator	1,500	—	ETL	$70.19	Buy
Costway NSC-150-7A2R oil-filled radiator	Oil-filled radiator	1,500	—	ETL	$71.99	Buy
Dreo HSH003A bathroom heatersold by Amazon	Fan heater · ALCI plug	1,500	34 dB	ETL	$84.99	Buy
GiveBest UPH300M fan heater	Fan heater	1,500	—	ETL	$85.99	Buy
Comfort Zone 32550 oil-filled radiatorsold by Amazon	Oil-filled radiator	1,500	—	ETL	$89.67	Buy
Dreo HSH034 fan heatersold by Amazon	Fan heater	1,500	34 dB	ETL	$89.95	Buy
Hykolity ZOH402E oil-filled radiator	Oil-filled radiator	1,500	—	ETL	$89.99	Buy
Dreo HSH010 oil-filled radiatorsold by Amazon	Oil-filled radiator	1,500	—	ETL	$99.99	Buy
Dr. Infrared DR-978 infrared heatersold by Amazon	Infrared	1,500	—	UL	$99.99	Buy
Dreo HSH011 oil-filled radiatorsold by Amazon	Oil-filled radiator	1,500	—	ETL	$135.89	Buy
Garage heaters: 240 V, need their own circuit
CTSC MGH1056-02 5,600 W garage heater	240 V · 6-30P plug	5,600	58 dB	UL	$143.99	Buy
CTSC MGH1085-02 8,500 W garage heater	240 V · hardwired	8,500	58 dB	UL	$161.99	Buy
CTSC MGH10100-02 10,000 W garage heater	240 V · hardwired	10,000	58 dB	UL	$269.99	Buy
Comfort Zone CZ260ERBK 10,000 W garage heatersold by Amazon	240 V · hardwired	10,000	—	ETL	$319.09	Buy
NewAir NGH1K6WH00 10,000 W garage heatersold by Amazon	240 V · hardwired	10,000	—	ETL	$389.99	Buy

Plug-in heaters here state 1,500 W, a thermostat, tip-over and overheat shutoff and a UL, ETL or CSA mark in their own listing. Garage heaters state a thermostat, an overheat cut-out and a mark. Noise is the listing's own figure; a dash means it doesn't say. Recalled models are left out. Prices read live November 4, 2026.

05 / Questions

Frequently asked

Is it safe to leave a space heater on overnight?: No. The CPSC says "Turn off heaters when sleeping," and the U.S. Fire Administration says to turn them off when you go to bed. Warm the room before bed, then switch it off, or use one with a timer so it turns itself off. An oil-filled radiator stays warm for a while after it is off.
What size space heater do I need?: Plan on 10 watts per square foot in an insulated room (Dimplex's rule). One 1,500 W plug-in heater warms about 150 sq ft. Bigger room claims on a listing do not mean more heat: every plug-in heater tops out at the same 1,500 W.
Which space heater is cheapest to run?: None. Every 1,500 W heater turns the same power into the same heat, so it costs about $0.27 an hour on high at the U.S. average price. A thermostat that switches it off and fewer hours of use are what lower the bill. Our cost page shows the price in your state.
Can I use a space heater in a bathroom?: Only one made for bathrooms, with a shock-guard plug (ALCI or GFCI). The CPSC says most electric heaters have no protection if they get wet and should not be used in bathrooms. Keep it away from the tub and sink.
What size heater do I need for a 2-car garage?: About 4,000 to 5,000 watts for 400 to 500 sq ft, and more if the garage has no insulation. That means a 240 V heater on its own circuit, put in by an electrician. A 120 V plug-in heater is too small.
Are infrared or oil-filled heaters more efficient?: No. At the same watts, every electric heater makes the same heat. They differ in how they deliver it: infrared warms what is in front of it, and oil-filled is silent and stays warm after you switch it off. Claims that one type saves money are the maker's, not a test.
Can I plug a space heater into an extension cord or power strip?: No. The CPSC says to plug space heaters directly into a wall outlet, never into an extension cord or power strip.

References

Sources

9 references · prices on November 4, 2026

1
U.S. CPSC news release, January 23, 2026: Keep warm and safe this winter (generators, furnaces and space heaters)

Read October 17, 2026. Portable heaters, including electric space heaters: an average of 1,600 fires, 70 deaths and 150 injuries a year (2020 to 2022). 3 feet from drapes, furniture and bedding; plug directly into a wall outlet, never an extension cord or power strip; "Turn off heaters when sleeping."
2
U.S. CPSC: CPSC Offers Tips to Prevent Home Fires From Space Heaters (Dec. 16, 2003)

Read October 20, 2026. Choose a heater "certified by a nationally recognized testing laboratory." "Never leave a space heater on when you go to sleep."
3
U.S. CPSC: Don't Use Electric Heaters in Bathrooms, CPSC Cautions (March 19, 1990)

Read October 20, 2026. "For this reason, electric heaters should not be used in bathrooms." GFCIs "shut down the power in milliseconds."
4
U.S. Fire Administration: Heating fire safety

Read October 20, 2026. "Turn space heaters off when leaving the room or going to bed." Keep anything that can burn at least 3 feet away.
5
U.S. DOE Energy Saver: Small Space Heaters (archived copy, March 24, 2026)

Read October 20, 2026. Plug directly into the wall outlet; a tip-over safety switch; a thermostat; the UL label.
6
Dimplex (heater maker): "How big a heater do I need to heat my room?"

"The general rule for electric heat is to use 10 watts of heat per square foot of space ... in a standard insulated room."
7
U.S. EIA: British thermal units (1 kWh = 3,412 Btu)

So 1,500 W = 5,118 Btu an hour.
8
U.S. EIA: average home electricity price

U.S. average 18.19¢ per kWh, Year-to-Date through July 2026. Same figure as our space heater cost page.
9
Amazon listings: watts, noise, plug, safety marks and room claims as each listing states them

35 heaters, decoded from each listing's own words; price, seller and stock read live November 4, 2026. No directory certifies space heaters.