Roundup · Bathroom
The room you occupy for fifteen minutes, with the least free floor space and the strictest electrical rules in the house. It changes what you should buy.
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A bathroom heater needs to work in minutes, not half an hour, and needs to fit where there is no floor space. A wall-mounted unit with scheduling is the strongest answer; a small fast ceramic unit is the budget one. Keep any portable heater well away from the tub or shower and use a GFCI-protected outlet.
Every other room on this site is a sizing problem. A bathroom is a placement problem with a sizing footnote, so the constraints go first.
Portable heaters are not wet-location equipment. They pull room air through a grille across a live element, and they are a substantial mains load. Manufacturer instructions for portable heaters commonly warn against use in the immediate vicinity of a bath or shower, and that warning is the one to take literally rather than creatively.
Bathroom receptacles are GFCI-protected, and that is a requirement of the National Electrical Code rather than a nicety. If you are plugging a heater in anywhere near water, that protection is the thing standing between a fault and you. Do not defeat it, and do not run the heater from a non-GFCI outlet in the next room via a cord — why cords are the wrong tool for a 12.5 A load.
Bathrooms are small, which for once works in your favor. At 10 W per square foot a typical bathroom needs well under a single heater's output — and because the room is small and usually has the door shut, it comes up fast.
| Room size | Watts needed | BTU/h | Plug-in heaters |
|---|---|---|---|
| 35 sq ft | 350 W | 1,194 | 1 |
| 50 sq ft | 500 W | 1,706 | 1 |
| 75 sq ft | 750 W | 2,559 | 1 |
| 100 sq ft | 1,000 W | 3,412 | 1 |
Computed as square feet x 10 W x insulation factor x (ceiling / 8 ft), for an average heated room — 10 W/sq ft, 8 ft ceiling. Heater count assumes the 1,500 W plug-in ceiling.
Almost every bathroom sits in the first two rows, which means a 750 W setting is genuinely sufficient for the room and halves both the running cost and the load on the circuit. The reason to buy a 1,500 W unit anyway is speed: getting from cold to comfortable in three minutes rather than six.
| Wattage | Per hour | 1 hours |
|---|---|---|
| 750 W | 13.8¢ | $0.14 |
| 1,500 W | 27.5¢ | $0.28 |
Computed at 18.34¢/kWh — the U.S. residential average for June 2026 (EIA, Electric Power Monthly, Table 5.6.A, released August 26, 2026). Your rate is on your own bill; substitute it and the arithmetic still holds. Figures assume full output for the whole period.
This is the room where the cost conversation almost evaporates. A twenty-minute run at 1,500 W is about nine cents. Scheduling that twenty minutes to land just before you get up — rather than leaving the heater on all morning — is the entire optimization, and it is why a timer matters more here than a thermostat does.
Ranked for fit, not for hype. Coverage and current draw are computed from each unit’s published wattage. Tap a row for the full write-up, or go straight to the listing.
| # | Product | Best for | Covers | Draw | Price |
|---|---|---|---|---|---|
| 1 | Heat StormNo photo Heat Storm HS-1500-PHXWall-mounted, which removes the entire tip-over failure mode rather than mitigating it — and Wi-Fi scheduling means it can heat a bathroom before you get in it. | Getting the heater off the floor | 150 sq ft | 12.5 A | Check price on Amazon |
| 2 | HoneywellNo photo Honeywell HCE200WA compact 1,500 W ceramic that publishes the two features cheap small heaters usually omit — a tip-over switch and overheat protection — in a body the size of a shoebox. | The smallest sensible footprint | 150 sq ft | 12.5 A | Check price on Amazon |
| 3 | LaskoNo photo Lasko 754200The 900 W low setting is the whole point: it is the rare listing that publishes both settings, so you can compute what the cheap mode actually costs instead of guessing. | One person at one desk | 150 sq ft | 12.5 A | Check price on Amazon |
Coverage computed at 10 W/sq ft, average insulation, 8 ft ceiling. Draw computed as watts ÷ volts. Neither figure is a manufacturer claim.
Top pick · Getting the heater off the floor
Wall-mounted, which removes the entire tip-over failure mode rather than mitigating it — and Wi-Fi scheduling means it can heat a bathroom before you get in it.
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Published output | 5,200 BTU/h |
| Mounting | Wall-mounted |
| Control | Wi-Fi app, remote scheduling |
| Element | Infrared quartz |
| Heat type | Infrared quartz |
| Maker’s coverage claim | None published — the coverage figure above is ours |
| Safety listing | No listing mark published in the listing text; check the rating plate for the UL or ETL mark. |
Who it is for
A bathroom, a small bedroom, a workshop corner — anywhere floor space is gone and a heater on the ground is a hazard.
What it is not for
Renters who cannot drill, and rooms where you want the heater to move with you.
Sources for this entry
2 · The smallest sensible footprint
A compact 1,500 W ceramic that publishes the two features cheap small heaters usually omit — a tip-over switch and overheat protection — in a body the size of a shoebox.
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Heat settings | 2, plus an adjustable thermostat |
| Safety | Tip-over switch, overheat protection, cool-touch housing |
| Maker's coverage claim | None published — sold as a personal heater |
| Heat type | Ceramic (PTC) |
| Maker’s coverage claim | None published — the coverage figure above is ours |
| Safety listing | No listing mark published in the listing text; check the rating plate for the UL or ETL mark. |
Who it is for
A desk, a small bedroom or a home office where the heater has to be out of the way but still needs a tip-over cutoff.
What it is not for
A large or open-plan room, and not unattended overnight use — no timer, no lock.
Sources for this entry
3 · One person at one desk
The 900 W low setting is the whole point: it is the rare listing that publishes both settings, so you can compute what the cheap mode actually costs instead of guessing.
| Published specification | |
|---|---|
| Rated power | 1,500 W high / 900 W low, at 120 V |
| Maker's coverage claim | None published — sold as a desktop heater |
| Thermostat | Adjustable, 11 settings |
| Size | 9.2" tall |
| Other modes | Fan-only |
| Heat type | Ceramic (PTC) |
| Maker’s coverage claim | None published — the coverage figure above is ours |
| Safety listing | No listing mark published in the listing text; check the rating plate for UL or ETL. |
Who it is for
A desk, a small office, a dorm room — somewhere you want heat on a person rather than in a room.
What it is not for
Overnight or unattended use, and not a nursery. Without a published tip-over cutoff it does not belong on carpet next to a bed.
Sources for this entry
Every roundup on this site names something to skip. It costs us nothing to publish and it is the fastest way to tell whether a buying guide was written for you or for its commission.
Any portable heater placed where it can be reached from the bath or shower
This is the entry rule for the room and it disqualifies placements rather than products. A portable space heater is not a wet-location appliance: it is not sealed, it draws room air through a grille, and it is a 12.5 A mains load. Manufacturers' own instructions for portable heaters routinely say not to use them in the immediate vicinity of a bath, shower or swimming pool. Keep any portable unit well outside reach of the tub and shower, plug it into a GFCI-protected outlet — bathroom receptacles are required to be GFCI-protected under the NEC — and if the only workable spot is close to the water, the answer is a fixed heater installed for the location, not a portable one moved closer.
An oil-filled radiator, in this room specifically
Oil-filled radiators are the top pick in our bedroom roundup and they are the wrong tool here for one reason: they take twenty to thirty minutes to warm up because they must heat several kilograms of steel and oil first. You are in a bathroom for a fraction of that. By the time it is doing useful work you have dried off and left, and you have paid for the whole warm-up. Speed is the requirement in this room and it is the one thing that type cannot offer.
Warming a bathroom lowers its relative humidity at constant moisture content, which is why a heated bathroom clears its mirror faster and feels less clammy. That is a real and pleasant effect.
It is not ventilation, and it does not solve a mold problem. Moisture removed from the air by warming it is still in the room; only an extractor fan or an open window takes it outside. A heater makes a damp bathroom more comfortable while leaving the underlying moisture exactly where it was.
And what we did not do: we have not tested these units, owned them, measured them or run them in a room. Everything above is compiled from published manufacturer specifications and live retail listings, with the electrical load, room coverage and running cost computed by us from the published wattage. The full method.
Only well away from the tub and shower, plugged into a GFCI-protected outlet. Portable heaters are not wet-location appliances and manufacturers generally warn against using them in the immediate vicinity of a bath or shower. A wall-mounted unit placed high and away from the water is the safer form factor.
Most bathrooms are 35–75 sq ft, which needs only 350–750 W at the standard 10 W per square foot. A 750 W setting is genuinely sufficient; the reason to buy a 1,500 W unit is to reach temperature faster.
Very little, because the runs are short. Twenty minutes at 1,500 W is about nine cents at the U.S. average rate of 18.34¢/kWh. Scheduling short runs rather than leaving a heater on is where the saving is.
Bathroom receptacles are required to be GFCI-protected under the National Electrical Code, and that protection is exactly what you want behind a mains appliance used near water. Never bypass it or run the heater from a non-protected outlet elsewhere.
Mounting deletes tipping, floor clearance, cord routing and child reach. Plug-in panels and one hardwired unit.
For rooms under 150 sq ft, where 1,500 W is oversized and the thermostat is what actually matters.
Why 12.5 continuous amps through a cord is the wrong tool, and what to do when the outlet is too far.
Wall-mounted infrared with Wi-Fi scheduling and a BTU figure that matches its wattage exactly.
Where the 750 / 1000 / 1500 W tiers come from, and why 1500 W is a hard ceiling on a U.S. outlet.
Heats you rather than the room — excellent where every other type struggles, and the shadowing problem.