Review · Purifier, heater and fan
The most-searched question about this machine is its wattage, and the number circulating online is from a different country's model. Here is the US answer, and what follows from it.
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In the United States the Dyson Purifier Hot+Cool HP1 is a 1,500 W heater on a 120 V outlet, the same ceiling as every other plug-in heater sold here. It draws 12.5 A and costs about 27.5 cents an hour to run. The 2,250 W figure in UK coverage is the 230 V model.
Search for this machine's wattage and you will quickly find 2,250 W. It appears in UK reviews of the HP1, alongside a running cost quoted in pence per hour. If you are shopping in the United States, that number is not yours, and using it will make every calculation you do wrong.
The reason is the outlet. Dyson sells the same product name into two different electrical systems, and the heating element is specified for each. Run the arithmetic both ways and it is obvious which figure belongs where:
| Market | Voltage | Rated heating power | Current draw |
|---|---|---|---|
| United Kingdom | 230 V | 2,250 W | 9.8 A |
| United States | 120 V | 1,500 W | 12.5 A |
| A 2,250 W heater on a US outlet | 120 V | 2,250 W | 18.8 A — impossible |
Current computed as watts / volts. The third row is the point: 18.8 A is far beyond the 12 A continuous limit a 15 A US branch circuit allows, so a 2,250 W plug-in heater cannot be sold for a US outlet at all.
A UK ring circuit and a 13 A plug carry 2,250 W without difficulty. A US 15 A branch circuit does not: electrical code caps a continuous load at 80% of the breaker rating, which is 12 A, which is 1,440 W. That is precisely why every plug-in heater sold in America — this one included — tops out at 1,500 W. The full circuit arithmetic is here.
US retail listings carry the machine as a 1,500 W heater, which matches the ceiling exactly. So the honest answer to “how many watts is the Dyson space heater” is 1,500 W in the US, and the more useful follow-up is that this tells you nothing that distinguishes it from a $40 tower — because they are the same 1,500 W.
Once the wattage is settled, everything else on this site applies to it unchanged. 1,500 W covers about 150 square feet at the standard 10 W per square foot, average insulation, 8-foot ceiling — a bedroom or a home office, not an open-plan living room.
| 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.
And the running cost is the same as any other 1,500 W heater, because all electric resistance heaters are about 100% efficient and a watt is a watt:
| Wattage | Per hour | 1 h | 4 h | 8 h |
|---|---|---|---|---|
| 1,500 W | 27.5¢ | $0.28 | $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.
There is no version of this where the premium price buys warmer air or cheaper hours. It buys the other two machines.
Top pick · 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.
“Dyson space heater safety” is a common search, and the answer is more favorable here than for most of the category — for a structural reason rather than a brand one.
There is no exposed element and no grille. The bladeless housing means there is nothing to poke a finger or a pencil through and nothing glowing that a curious child can reach. Compared with a bare quartz tube or an open ceramic grille, that is a genuine reduction in the contact-burn failure mode, and it is the single best argument for this machine in a household with children.
What it does not change is the failure mode that actually causes fires. The U.S. Fire Administration identifies a heat source too close to combustibles as the leading factor contributing to ignition in residential heating fires, and no housing design fixes a curtain sitting eight inches from the air outlet. The three-foot clearance rule applies to this machine exactly as it applies to a $40 tower, and so does the guidance to turn it off when you leave the room or go to bed.
On the circuit, it is a 12.5 A continuous load like every other 1,500 W heater. In a home office — which is where a machine like this usually ends up — that matters, because a desktop, two monitors and a printer on the same breaker will push you past a 15 A circuit's allowance. The office-specific version of this problem.
As with every product on this site, we report the safety listing the manufacturer publishes. The Amazon listing text does not state a UL or ETL mark, so check the rating plate on the machine itself — here is how to verify one.
The case for this machine is genuinely good, and it has nothing to do with heating. If you already want an air purifier and already want a fan, then a single object that does both plus supplementary heat is a reasonable purchase, and the purifier and fan earn their keep in the eight months of the year when nobody wants heat at all. Build quality and support are also not in the same conversation as a budget tower.
The case against is equally simple. If the problem you are solving is that a room is cold, you are about to spend many times what the job costs. A correctly sized ceramic tower with a digital thermostat puts exactly the same 1,500 W into exactly the same room at exactly the same 27.5 cents an hour — the small-room picks start at a small fraction of the price.
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.
1,500 W in heater mode on a US 120 V outlet, which is the ceiling for any plug-in heater sold in America. The 2,250 W figure that appears in UK coverage is the 230 V model — at 120 V that would draw 18.8 A, which no US outlet supports.
About 27.5 cents an hour at 1,500 W and the U.S. average residential rate of 18.34¢/kWh — the same as any other 1,500 W heater. An eight-hour day is roughly $2.20 at full output.
About 150 sq ft at the standard 10 W per square foot. The larger square-footage figures Dyson markets describe air purification coverage, not heating coverage — they measure different things.
The bladeless housing has no exposed element and no grille, which genuinely reduces the contact-burn risk compared with an open ceramic or quartz heater. It does not change the clearance rule: keep three feet clear in every direction, and turn it off when you leave the room.
Not for heat. It delivers the same 1,500 W at the same cost per hour as a budget tower. It is worth considering if you also want the air purifier and the year-round fan and would rather own one machine than three.
Desk-side picks with a low setting, plus the circuit-load problem an office heater creates.
Silent by design, not by adjective — the fanless types, plus the one unit that publishes a dB figure.
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.
For rooms under 150 sq ft, where 1,500 W is oversized and the thermostat is what actually matters.
1,500 W, a published 300 sq ft claim that survives the arithmetic, and a thermostat with numbers.