Roundup · 1,500 W
Almost every plug-in heater sold in America is 1,500 W. Here is why, and what is actually left to choose between once the wattage is identical.
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Almost every plug-in heater in the US is 1,500 W because a 120 V, 15 A circuit allows no more as a continuous load. Every 1,500 W heater therefore produces about 5,118 BTU/h and costs about 27.5 cents an hour. The choice is entirely control, safety disclosure, noise and shape.
It is not a design convention or a marketing tier. It is the arithmetic of a US branch circuit. A 15 A circuit carrying a load for three hours or more is treated as continuous and may not exceed 80% of the breaker rating — 12 A, which at 120 V is 1,440 W. Manufacturers build to 1,500 W, a whisker over, and the result is that the entire plug-in category is clustered at one output. The full continuous-load arithmetic.
| Heater | Draw at 120 V | 15 A circuit (12 A limit) | 20 A circuit (16 A limit) |
|---|---|---|---|
| 750 W | 6.3 A | Fits | Fits |
| 900 W | 7.5 A | Fits | Fits |
| 1,200 W | 10.0 A | Fits | Fits |
| 1,500 W | 12.5 A | Over the limit | Fits |
| Maximum continuous | — | 12 A = 1,440 W | 16 A = 1,920 W |
Draw computed as watts / 120 V. The continuous limit is 80% of the breaker rating, which follows from the NEC's requirement to size a circuit at 125% of a continuous load (NFPA 70, 210.19(A)(1) and 210.20(A)).
So "best 1,500 watt space heater" is a slightly different question from the one it looks like. You are not choosing an output — you have already chosen it, and so has everyone else. You are choosing among machines with identical heat and identical running cost.
Control precision, first and by a distance. Hours are the only variable in your bill once wattage is fixed, and the instrument that removes hours is the thermostat. A heater you can set to 64°F cycles off and stays off; a dial marked low-to-high gets set too high, overshoots, and gets switched off manually an hour later than it should. Only 7 of the 29 purchasable heaters we track publish a thermostat range in degrees at all.
A published low setting, which is the second operating point. A 1,500 W heater with a published 900 W step costs 16.5 cents an hour in that step instead of 27.5, and draws 7.5 A instead of 12.5 — which also means it fits a shared circuit. The catch is that most listings say "three heat settings" and publish no wattages, leaving you one costable number out of three.
Then shape and noise, which decide whether you keep using it. Fanless radiators are silent and slow; ceramic fan heaters are fast and audible; towers oscillate and tip; tabletop units sit where cords get stepped on. None of this changes the heat. All of it changes whether the heater ends up in a closet by February.
At 10 W per square foot, 1,500 W is about 150 sq ft with average insulation and an 8-foot ceiling. Multiply by 1.25 for a drafty room and 1.5 for one outside the heated envelope, and that figure falls fast.
| Room size | Watts needed | BTU/h | Plug-in heaters |
|---|---|---|---|
| 100 sq ft | 1,000 W | 3,412 | 1 |
| 150 sq ft | 1,500 W | 5,118 | 1 |
| 200 sq ft | 2,000 W | 6,824 | 2 (different circuits) |
| 300 sq ft | 3,000 W | 10,236 | 2 (different circuits) |
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.
This is the honest ceiling on the whole category and it is why so many 1,500 W heaters disappoint: a 300 sq ft living room needs about 3,000 W and a wall outlet will not give it to you. If the room is bigger than about 150 sq ft, the heater is a supplement to your central heat rather than a replacement for it, and no amount of shopping within the 1,500 W class changes that.
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 |  Dreo Solaris 718The rare heater whose published coverage claim survives the arithmetic: 1,500 W is a genuine 300 sq ft at 10 W/sq ft, and Dreo publishes that number rather than implying more. | A whole living room | 150 sq ft | 12.5 A | $129.99 · Check on Amazon |
| 2 |  Lasko 755320A 23-inch digital tower with a thermostat, an 8-hour timer and a remote — and the only heater here whose published coverage figure lands exactly where our own sizing rule puts it. | The maker's coverage claim that matches the arithmetic | 150 sq ft | 12.5 A | $59.99 · Check on Amazon−25% |
| 3 |  De'Longhi TRD40615TNo fan, so no noise and no moving dust — and the sealed oil keeps radiating after the element cuts out, which is why an oil-filled unit feels steadier than a ceramic one at the same wattage. | Silence, and a bedroom | 150 sq ft | 12.5 A | $159.95 · Check on Amazon |
| 4 |  Vornado VMHi500The current top of Vornado's metal line: auto-climate control, two LED displays and a 1-12 hour timer in a cool-touch metal box, backed by five years. | A metal cabinet that stops on its own | 150 sq ft | 12.5 A | $135.99 · Check on Amazon |
| 5 |  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 |
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 whole living room
The rare heater whose published coverage claim survives the arithmetic: 1,500 W is a genuine 300 sq ft at 10 W/sq ft, and Dreo publishes that number rather than implying more.
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Maker's coverage claim | 300 sq ft |
| Thermostat | 41–95°F digital, 1°F increments |
| Oscillation | 30° / 60° / 90° / 120° |
| Dimensions | 7.9" D x 7.9" W x 29.7" H, 8 lb |
| Safety | Tip-over cutoff, overheat cutoff, child lock, thermal cutoff |
| Heat type | Ceramic (PTC) |
| Maker’s coverage claim | 300 sq ft |
| Safety listing | ETL listed (stated by Dreo on the product page) |
Who it is for
A living room, bedroom or den at or under 300 sq ft with average insulation and an 8-foot ceiling, where you want to set a temperature and stop thinking about it.
What it is not for
A garage, an uninsulated basement, or anything over about 300 sq ft. It is not under-powered — 1,500 W is the plug-in ceiling — the room is simply too big for one outlet.
2 · The maker's coverage claim that matches the arithmetic
A 23-inch digital tower with a thermostat, an 8-hour timer and a remote — and the only heater here whose published coverage figure lands exactly where our own sizing rule puts it.
| Published specification | |
|---|---|
| Rated power | 900 W to 1,500 W (Lasko's published range) |
| Heat settings | Two |
| Thermostat | Adjustable, with a digital display |
| Oscillation | Yes |
| Timer | 8 hours |
| Remote | Included, with onboard storage |
| Size | 23" H x 7.25" D x 7.00" W, 7.29 lb |
| Safety | Cool-touch housing, automatic overheat protection |
| Warranty | 3 years |
| Heat type | Ceramic (PTC) |
| Maker’s coverage claim | 150 sq ft |
| Safety listing | ETL listed, stated on Lasko's own product page. |
Who it is for
A home office, family room or bedroom at or under 150 sq ft where you want a real thermostat and a timer without paying for a metal cabinet.
What it is not for
A nursery, or a room where a curious pet or toddler can reach it. No child lock and no published tip-over switch is the wrong combination at floor height.
3 · Silence, and a bedroom
No fan, so no noise and no moving dust — and the sealed oil keeps radiating after the element cuts out, which is why an oil-filled unit feels steadier than a ceramic one at the same wattage.
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V |
| Controls | Mechanical, with a programmable 24-hour timer |
| Fluid | Permanently sealed diathermic oil — never needs refilling |
| Maker's claim | Up to 75% more radiant surface area |
| Mobility | Front and rear handles, snap-on wheels |
| Heat type | Oil-filled |
| Maker’s coverage claim | None published — the coverage figure above is ours |
| Safety listing | No listing mark published in the listing text; verify the UL or ETL mark on the rating plate. |
Who it is for
A bedroom, a nursery at a safe distance, or anywhere the fan noise of a ceramic heater is the actual problem you are trying to solve.
What it is not for
Fast heat, and not a room you only occupy for twenty minutes. It also should never be tucked beside a bed or curtain — hot surface, 3-foot rule.
4 · A metal cabinet that stops on its own
The current top of Vornado's metal line: auto-climate control, two LED displays and a 1-12 hour timer in a cool-touch metal box, backed by five years.
| Published specification | |
|---|---|
| Rated power | 1,500 W at 120 V (retail listings; Vornado publishes settings, not watts) |
| Heat settings | 2, plus fan-only |
| Thermostat | Auto-Climate Control, digital |
| Timer | 1–12 hours |
| Display | Two LED displays, for reading it from across the room |
| Housing | Cool-touch, powder-coated gloss metal cabinet with cord storage |
| Safety | Tip-over protection and a 2-stage auto shutoff |
| Warranty | 5-year satisfaction guarantee |
| Heat type | Fan-forced |
| Maker’s coverage claim | None published — the coverage figure above is ours |
| Safety listing | Vornado publishes tip-over protection and a 2-stage auto shutoff but does not name a listing mark; check the rating plate. |
Who it is for
A living room or bedroom where the heater is permanent and visible, and where a real thermostat, a timer and a cool metal shell are worth paying for over a plastic tower.
What it is not for
A nursery, because no child lock is published; and not silence, which means an oil-filled radiator instead.
Sources for this entry
5 · 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
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.
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 1,500 W heater advertised above about 5,120 BTU/h
1 W = 3.412142 BTU/h exactly, so 1,500 W is 5,118 BTU/h and there is no mechanism by which a resistance heater exceeds it. A listing claiming more is either quoting a different unit, quoting a 240 V model's figure, or quoting nothing in particular. Where a maker rounds to 5,200 that is rounding; where a listing claims 10,000 BTU for a 1,500 W plug-in heater, that is the single clearest signal in this category that nothing else on the page should be trusted either.
A second 1,500 W heater for the same room
This is the most common and most expensive mistake in the category, because it usually does not work and sometimes trips a breaker. Two 1,500 W heaters is 25 A, which no 15 or 20 A circuit will carry as a continuous load — so they must be on separate circuits, and most houses put a bedroom's outlets on one. If one 1,500 W heater is not enough, the room needs more than a plug-in heater can deliver, and that is a sizing problem rather than a shopping one.
There are exactly two routes past the cap and neither is a plug-in heater. A 240 V hardwired unit heater runs on its own two-pole circuit and starts at 3,000 W, which is the real answer for a garage or an outbuilding — the draw, the breaker and the picks. Or you stop trying to heat the room and heat yourself instead, with a radiant panel at 170 W that warms a person rather than 3,000 cubic feet of air. Buying a second 1,500 W heater is the one route that does not work, for the reasons in the skip section above.
Because a 120 V, 15 A branch circuit cannot carry more as a continuous load. Electrical code treats a load running three hours or more as continuous and caps it at 80% of the breaker rating — 12 A, or 1,440 W at 120 V. Manufacturers build to 1,500 W and the whole category clusters there.
About 5,118 BTU/h. 1 W is 3.412142 BTU/h exactly, so the conversion is fixed and there is no way for a resistance heater to beat it. Listings that round to 5,120 or 5,200 are rounding; listings claiming substantially more are not quoting heat output.
For about 150 sq ft with average insulation and an 8-foot ceiling, yes. Multiply by 1.25 for a drafty room and 1.5 for a space outside the heated envelope, so a drafty 200 sq ft room is already past it. Above that, a plug-in heater is a supplement to central heat rather than a substitute.
About 27.5 cents an hour at our published rate of 18.34 cents per kWh, which is roughly $66 a month at eight hours a day and about $198 a month running continuously. A published 900 W setting brings the hourly figure to about 16.5 cents.
None of them, in the sense people mean. All electric resistance heaters are about 100% efficient, so at 1,500 W they all deliver the same heat for the same money. The only feature that genuinely lowers a bill is a thermostat or timer, because it removes running hours.
No. Two of them is 25 A, well past the 12 A continuous allowance on a 15 A circuit and past the 16 A allowance on a 20 A circuit. They would need separate circuits, and in most houses a bedroom's outlets are on one.
12.5 A against a 12 A continuous limit — the arithmetic nobody publishes, and what to do about it.
A correction, not a product pick: equal wattage means equal cost, and here is what actually varies.
Where the 750 / 1000 / 1500 W tiers come from, and why 1500 W is a hard ceiling on a U.S. outlet.
Where the 10 W/sq ft rule comes from, when it breaks, and the exact watt-to-BTU conversion.
5,000 to 7,500 W, hardwired. The draw, the breaker each one needs, and four units whose manuals we read.
All electric heaters are 100% efficient. These are picked on the three things that actually cut the bill.