Roundup · Office
The office is the one room where the right answer is often to heat the person rather than the room — and where the circuit is a real constraint.
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For a home office, a compact heater with a published low setting is usually the right buy: a person at a desk needs far less heat than the room does. Check what else is on the circuit first — a 1,500 W heater plus a desktop computer can exceed a 15 A branch circuit's continuous limit.
A home office is typically 80–120 sq ft, which at 10 W per square foot needs 800–1,200 W — comfortably inside one heater's capability, and comfortably inside a 900 W low setting for much of the year. But there is a better framing available here than in any other room: you are stationary, in one chair, for hours. Radiant heat aimed at a person from three feet away makes them comfortable at a fraction of the energy it takes to raise a room's air temperature.
| Wattage | Per hour | 4 h | 8 h |
|---|---|---|---|
| 750 W | 13.8¢ | $0.55 | $1.10 |
| 900 W | 16.5¢ | $0.66 | $1.32 |
| 1,500 W | 27.5¢ | $1.10 | $2.20 |
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.
An eight-hour working day on a 900 W setting is a materially different number from the same day at 1,500 W, and in a 100 sq ft office the low setting is very often enough once the room is up to temperature. This is the room where the low-setting habit pays best, because the runtime is long and predictable.
Home offices concentrate load. A desktop under sustained use, two monitors, a docking station, speakers, a laser printer and a heater are all on the outlets in one small room, and in most houses those outlets share a breaker with the rest of that side of the floor.
The arithmetic is unforgiving: 12.5 A for the heater leaves nothing on a 12 A continuous allowance. Running the heater at 900 W instead brings it to 7.5 A and leaves genuine headroom. If you want full output, find an outlet on a different circuit — how to work out which outlets share a breaker.
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 |  Honeywell HCE220BA shoebox-sized ceramic heater that publishes four preset temperatures and a 2/4/8-hour auto-off — specificity almost nothing else this size offers. | A thermostat with numbers on it, on a small heater | 150 sq ft | 12.5 A | $59.99 · Check on Amazon |
| 2 |  Lasko 754201The 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 | $49.99 · Check on Amazon |
| 3 | LaskoNo photo Lasko Ellipse CD12950The short answer to “which small heater has a child lock”: a tabletop unit that publishes a tip-over switch, a child lock and an auto-eco mode rather than leaving you to guess. | A desk, a nursery, a small bedroom | 150 sq ft | 12.5 A | Check price on Amazon |
| 4 |  Dyson Hot+Cool HP1You are paying for the air purifier and the year-round fan, not for heat: on a 120 V outlet it is capped at the same 1,500 W as a $40 tower, and it costs the same per hour to run. | A machine that also does something else | 150 sq ft | 12.5 A | $499.99 · Check on Amazon−24% |
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 · A thermostat with numbers on it, on a small heater
A shoebox-sized ceramic heater that publishes four preset temperatures and a 2/4/8-hour auto-off — specificity almost nothing else this size offers.
| Published specification | |
|---|---|
| Rated power | 1,500 W maximum at 120 V |
| Heat settings | 2 (high and low) |
| Thermostat | Four preset comfort levels — 65°, 70°, 75° and 80°F |
| Auto-off timer | 2, 4 or 8 hours |
| Safety | Tip-over switch; 2x overheat protection (high-temperature sensor plus a thermal cut-off fuse); cool-touch housing |
| Size | 8.5" x 4.5" x 8.86", 2.8 lb |
| Warranty | 3-year limited |
| Heat type | Ceramic (PTC) |
| Maker’s coverage claim | None published — the coverage figure above is ours |
| Safety listing | Honeywell does not publish a UL or ETL mark for this model; it does publish two independent overheat mechanisms. Check the rating plate. |
Who it is for
A small office, a bedside table or a desk, where the heater needs to hold roughly a known temperature and switch itself off after a few hours.
What it is not for
A large or drafty room, and not a nursery — no child lock is published and the presets are reachable by anyone who can reach the unit.
Sources for this entry
2 · 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 |
| Thermostat | Adjustable dial; 2 heat settings plus fan-only |
| Size | 9.2 x 7 x 6 in, 2.93 lb |
| Cord | 6 ft (Lasko's published figure) |
| Safety | Tip-over switch, overheat protection, cool-touch housing |
| Warranty | 3 years |
| Heat type | Ceramic (PTC) |
| Maker’s coverage claim | 100 sq ft |
| Safety listing | ETL listed, per Lasko's published specification — one of the few in this roundup that names a mark rather than leaving it to the rating plate. |
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
A nursery, and not unattended use. It publishes a tip-over switch and overheat protection, but no child lock — and the USFA's advice to switch a heater off when you leave the room applies to every unit on this site, listed or not.
3 · A desk, a nursery, a small bedroom
The short answer to “which small heater has a child lock”: a tabletop unit that publishes a tip-over switch, a child lock and an auto-eco mode rather than leaving you to guess.
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Maker's coverage claim | None published |
| Controls | Digital display, thermostat, AutoECO mode, remote |
| Oscillation | Wide oscillation |
| Safety | Tip-over switch, child lock |
| Heat type | Ceramic (PTC) |
| Maker’s coverage claim | None published — the coverage figure above is ours |
| Safety listing | No listing mark is published in the Amazon listing text; verify the UL or ETL mark on the rating plate. |
Who it is for
A small room — a nursery, a home office, a bedroom under about 150 sq ft — where the controls need to be lockable.
What it is not for
An open-plan living room. A tabletop unit oscillating across a desk is not going to move 1,500 W of heat around 400 sq ft.
Sources for this entry
4 · A machine that also does something else
You are paying for the air purifier and the year-round fan, not for heat: on a 120 V outlet it is capped at the same 1,500 W as a $40 tower, and it costs the same per hour to run.
| Published specification | |
|---|---|
| Rated power (US) | 1,500 W at 120 V — carried as a 1,500 W heater on US retail listings |
| Rated power (UK model) | 2,250 W at 230 V — a different market's unit, and not what you can buy here |
| Modes | Purifier, heater, fan |
| Coverage claims | Dyson's large square-footage figures describe air purification, not heating |
| Control | Remote, app |
| Heat type | Fan-forced |
| 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
Someone who already wants an air purifier and a fan and would rather own one object than three.
What it is not for
Anyone buying on heat per dollar. If the job is warming a room, a $40 ceramic tower does exactly the same 1,500 W of work.
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.
A 1,500 W heater on the same circuit as your computer and monitors
This is the office-specific failure and almost nobody flags it. A 1,500 W heater draws 12.5 A continuously; a 15 A circuit supports 12 A continuously. Add a desktop, two monitors, a laser printer's startup surge and a phone charger and you are past the limit before the heater has done anything wrong. The consequence is not a fire — it is a tripped breaker in the middle of a video call, or worse, at the moment the printer's motor kicks in. Either run the heater on a low setting or find an outlet on a different breaker. The arithmetic.
A tower heater under a desk
Tall, narrow units are designed to oscillate into a room from an open floor. Under a desk they are in a confined space surrounded by a chair, a computer tower, a wastebasket and cables — which is why a 170 W under-desk radiant panel is the right shape for that spot — every one of which is either a combustible or an airflow blockage, and the latter is what trips a thermal cutoff. A short, wide unit designed to sit on or under a desk is a better shape for the space, and it is a shape you can actually keep clear.
If the office is not yours, check the policy before you buy. Many commercial leases and most managed workspaces prohibit personal heaters outright, and the reason is exactly the circuit arithmetic above — a building's per-desk power allowance was not designed with a 12.5 A appliance in mind. A heated desk mat or a low-wattage personal heater is usually the version that survives a facilities conversation.
One note on the premium option in the table above: the Dyson draws the same 12.5 A as everything else here, and the wattage figure most commonly quoted for it online belongs to a different country's model. Our full Dyson Hot+Cool HP1 review works through what the US unit actually draws and what it covers.
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.
A short, wide unit with a published tip-over cutoff and a low setting, positioned with clear space around it. Avoid tall tower heaters under desks — the confined space blocks airflow and puts the unit among cables and a chair.
It can. A 1,500 W heater draws 12.5 A and a 15 A circuit supports 12 A continuously, so a heater plus a desktop computer and monitors can exceed the limit. Using a 900 W setting or a different circuit solves it.
At 18.34¢/kWh, a 1,500 W heater for an eight-hour day is about $2.20, or roughly $46 a month of workdays. A 900 W setting is about $1.32 a day.
Often not. Many commercial leases and managed workspaces ban them because of the circuit load a 12.5 A appliance adds to a floor's power allowance. Check before buying.
For rooms under 150 sq ft, where 1,500 W is oversized and the thermostat is what actually matters.
12.5 A against a 12 A continuous limit — the arithmetic nobody publishes, and what to do about it.
1,500 W in the US, not the 2,250 W UK coverage quotes — and what that changes about the room it heats.
Cost per hour for any wattage at any rate — the calculator, the formula and the full grid.
All electric heaters are 100% efficient. These are picked on the three things that actually cut the bill.
Where the 750 / 1000 / 1500 W tiers come from, and why 1500 W is a hard ceiling on a U.S. outlet.
How a PTC element self-limits its temperature, and which rooms ceramic heaters actually suit.
Shoebox-sized, 1,500 W, with a published tip-over cutoff — and a dial you cannot set to a number.
A desk does not need a room heater. 170 W of radiant panel against 1,500 W — the arithmetic and the picks.
Chosen for a lease, a shared breaker panel and a neighbor through the wall — not for a floor plan.