Best Small Heater for Under a Desk at an Office

Before you buy, ask facilities or HR. The two workplace rules we read in full, for U.S. congressional offices and North Carolina state offices, say three things: get permission, keep 3 feet clear, and turn the heater off when you leave.

1. Ask first. Your workplace may not allow heaters at all. “Check with your employer to see if they allow space heaters in your workplace and, if they do, whether they have a list of approved devices.” (OCWR)
2. Under a desk, 3 feet of clear space is hard to keep. “Space heaters shall not be used under desk or other furniture or equipment unless the aforementioned space requirements shall be met.” (North Carolina) “A minimum three feet area around, in front of, and above the space heater or an area greater as recommended by the manufacturer will be maintained around the space heater as clearance from combustibles.” (North Carolina)
3. Foot warmers and heated pads count as heaters too. “this also includes items such as but not limited to electric blankets, pads, “foot warmers” and similar products that produce heat from an electrical or fuel source.” (North Carolina)
4. Some rules list the safety features a heater must have. “The space heater must contain fully enclosed heating surfaces, be provided with a thermostat, tip over safety shut off, and be listed by an approved listing agency such as Underwriter Laboratories” (North Carolina) “Look for a space heater that has safety features such as a tip-over switch, overheat sensor, and touch sensor.” (OCWR)
5. Plug it straight into a wall outlet. “Plug space heaters directly into a grounded wall outlet, not an extension cord or a power strip.” (OCWR)
6. Turn it off when you leave your desk. “Never leave a space heater unattended. Turn the heater off before leaving your workspace” (OCWR)
7. If the breaker trips, call facilities. “Electrical circuits shall not be overloaded. Do not reset any tripped breakers.” (North Carolina)

These are the rules for U.S. congressional offices (OCWR) and North Carolina state offices. Your employer's may be stricter or looser. A heater the lab rated zero-clearance, like the Cozy Legs panel, is made to sit close to things, but a rule like North Carolina's still asks for 3 feet.^[1][2]

A heater turns every watt it draws into heat, so the cost depends only on its watts and your power price. At the U.S. average home price of 18.2¢ per kWh (EIA, January through July 2026), an 8-hour workday at full power costs 22¢ at 150 W, 58¢ at 400 W, $1.09 at 750 W and $2.18 at 1,500 W.^[6]

Watts are also heat: 400 W makes 1,365 Btu an hour and 1,500 W makes 5,118 (EIA: 1 kWh = 3,412 Btu). A low-watt heater warms your feet and hands. It will not warm a cold office.^[7]

Circuits: amps = watts ÷ 120 volts. A 1,500 W heater draws 12.5 amps, most of what a 15-amp circuit can carry, and your computer and monitors share that circuit. A 400 W heater draws 3.3 amps and a 150 W panel 1.25.

These are home electricity prices. At work, your employer pays the bill. A thermostat that cycles the heater off lowers the real cost; these figures are the most it can cost, running all day.

Cost of one 8-hour workday at full power, by state. EIA home electricity prices, January through July 2026. Workday = 8 hours × watts ÷ 1,000 × the state's average price per kWh.

1. 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)
2. 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)
3. 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)
4. Never use an extension cord or power strip. “Plug electric space heaters directly into a wall outlet—never into an extension cord or power strip.” (CPSC)

The CPSC counts about 1,600 fires, 70 deaths and 150 injuries a year from portable heaters (2020 to 2022).^[3]

The 17 in-stock desk heaters that state a safety mark: watts, thermostat, tip-over and overheat shutoff, safety mark, workday cost and Amazon price

Heater	Watts	Thermostat	Tip-over	Overheat	Mark	Workday	Price	Buy
Low-power heaters, under 1,500 W: warm your feet and hands
Cozy Products Cozy Legs (CL)	150	✓	—	—	ETL	22¢	$49.99	Buy
Chochoyah under-desk warmer	150	✓	✓	✓	UL	22¢	$65.99	Buy
Lasko MyHeat ceramic heater (3-pack)	200	—	—	✓	ETL	29¢	$105.11	Buy
Lasko MyHeat Mini (201)sold by Amazon	400	—	—	✓	ETL	58¢	$29.44	Buy
Upwsma heater	500	✓	—	—	UL	73¢	$28.20	Buy
Cozy Products ESH heater	750	✓	✓	—	ETL	$1.09	$47.89	Buy
BZGG Q22 heater	1,000	—	✓	✓	UL	$1.46	$22.99	Buy
Desk-size 1,500 W heaters with every safety feature
Dreo Atom 316 (HSH006)sold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$35.96	Buy
Dreo HSH020 heatersold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$49.99	Buy
Dreo HSH019 heatersold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$69.99	Buy
Dreo HSH004 ceramic heatersold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$44.93	Buy
Kismile PTC909A ceramic heater	1,500	✓	✓	✓	ETL	$2.18	$24.99	Buy
Chikit PTC-SH002 ceramic heatersold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$28.70	Buy
Winhl PTC-150A ceramic heater	1,500	✓	✓	✓	ETL	$2.18	$29.96	Buy
Lasko MyHeat CD09101 ceramic heatersold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$38.27	Buy
Lasko 754201 ceramic heatersold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$39.99	Buy
Dreo Atom Onesold by Amazon	1,500	✓	✓	✓	ETL	$2.18	$60.49	Buy

Desk-size means 12 inches tall or less, or under 1,500 W. A check means the heater's own listing states the feature; a dash means it does not say. Every heater listed states a UL, ETL or CSA mark, the one rule every source shares. Watts are the listing's figure; * marks the maker's spec sheet. Workday cost is 8 hours at full power at the U.S. average home price. Recalled models are left out. Prices read live November 4, 2026.

Can I use a space heater under my desk at work?

Only if your employer allows it and you can keep the clearance your rules and the maker ask for. North Carolina's state offices ban heaters under desks unless 3 feet of clear space is kept around, in front of and above the heater. Ask facilities or HR first.

Do I need permission to use a space heater at work?

Often, yes. The U.S. Office of Congressional Workplace Rights says to check whether your employer allows heaters and whether it keeps a list of approved models. North Carolina's state offices need a signed permit.

How many watts do I need for under a desk?

To warm your feet and legs, 150 to 400 W is enough; it makes 512 to 1,365 Btu an hour. A 1,500 W heater makes almost four times the heat of 400 W, and draws 12.5 amps.

Will a space heater trip the breaker at work?

It can. A 1,500 W heater draws 12.5 amps on its own, most of a 15-amp circuit, before your computer and monitors. A 400 W heater draws 3.3 amps. If a breaker trips, call facilities; North Carolina's rule says not to reset it yourself.

How much does it cost to run a desk heater all day?

At the U.S. average home power price, an 8-hour day costs 22¢ at 150 W, 58¢ at 400 W and $2.18 at 1,500 W. It ranges from $1.48 in North Dakota to $5.55 in Hawaii at 1,500 W. Our table shows every state.

Is it safe to leave a desk heater on all day?

Only while you are at your desk. OCWR says to turn the heater off before leaving your workspace, and North Carolina's rule says off when unattended and at the end of the day. A timer helps you remember.

Is a heated panel or foot warmer safer than a fan heater?

It uses far less power and has no fan, and some are rated to sit close to things. It still counts as a space heater under rules like North Carolina's, and it warms only what touches or faces it.

• Best space heater for every room
• What a space heater costs to run in your state
• Heated blanket vs space heater
• Best electric blankets and heated throws
• The most energy-efficient space heater

1. 1

   Office of Congressional Workplace Rights (OCWR): Portable Space Heaters, Fast Facts (October 2023)

   Read October 25, 2026. Check whether your employer allows heaters; a tip-over switch and overheat sensor; a testing-lab label; plug into a grounded wall outlet; 3 feet from anything that can burn; turn it off before leaving your workspace. "Average electric space heaters range from 400–1,500 watts."

2. 2

   North Carolina Office of State Human Resources: Space Heater Use Program (revised March 6, 2019)

   Read October 25, 2026. Covers N.C. state agencies and UNC System universities: a permit; a thermostat, tip-over shutoff and a UL or similar listing; 3 feet of clearance; no use under a desk unless that clearance is kept; foot warmers count; do not reset tripped breakers.

3. 3

   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."

4. 4

   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."

5. 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. 6

   U.S. EIA: Electric Power Monthly, Table 5.6.B, average residential price of electricity by state

   Year-to-Date through July 2026. U.S. average 18.19¢ per kWh. Same figures as our space heater cost page.

7. 7

   U.S. EIA: British thermal units (1 kWh = 3,412 Btu)

   So 400 W = 1,365 Btu an hour and 1,500 W = 5,118.

8. 8

   Vornado: VH202 Personal Heater specifications

   Read October 25, 2026. "Watts 750/375"; "Heat Regulation None"; "a tipover switch that immediately cuts the heat and fan if the heater tips."

9. 9

   Cozy Products: Cozy Legs flat panel heater

   Read October 25, 2026. "Uses only 150 watts." "ETL-certified Zero-Clearance." "Built-in Thermostat: Maintains a steady operational temperature of around 130°F."

10. 10

    Amazon listings: watts, safety features, marks, noise and height as each listing states them

    55 desk-size heaters in stock, decoded from each listing's own words; the table shows the 17 that state a safety mark. Price, seller and stock read live November 4, 2026. No directory certifies space heaters.