Best space heaters, by the room they fit

How to read a roundup on this site

Every roundup here opens with a quick-picks table, and every row in that table carries the same four things: what the unit is best for, its rated wattage, the room size that wattage covers at our stated assumptions, and a link to check the current price. Below the table, each pick gets a full write-up with published specifications, an explicit “not for” paragraph, and the sources those specs came from.

What you will not find is a score out of ten. We have not tested these units and a numeric rating would imply an evaluation we did not perform. What we have done is compile the manufacturer's published figures, compute the electrical load and the running cost, check whether a safety listing is published, and say plainly where a listing does not publish one.

The uncomfortable thing about “best”

In most product categories, the premium option is meaningfully better than the budget one. In this category it largely is not, and pretending otherwise would be the easiest way for us to make money and the fastest way to deserve none of it.

A $40 ceramic tower and a $600 designer unit both draw 1,500 W from the same outlet and both put the same heat into the same room at the same cost per hour. The premium buys build quality, control precision, quietness, warranty, and in some cases a second appliance entirely — but it does not buy heat. If your problem is that a room is cold, the cheapest correctly sized heater with a working thermostat and a tip-over cutoff solves it as completely as anything on the market.

What is genuinely worth paying for, in rough order: a digital thermostat with numbers on it (a dial you cannot set to 68°F wastes money every night), a timer (the only honest answer to overnight running), a tip-over cutoff and child lock if there are children or animals, and silence if the heater lives in a bedroom.

Start from your room

• A whole living room, 250–400 sq ft: best for large rooms — and read the two-heater arithmetic there first.
• A bedroom, office or nursery under about 150 sq ft: best for small rooms, best for a bedroom, best for a nursery.
• Somewhere that is not part of the heated house: basement and garage. The garage answer is not a plug-in heater and we explain why.
• Specific requirements: the safest picks, the quietest, for a home office, and the ones that will genuinely cost you least.

Every roundup links back to the sizing calculator and the cost calculator, because a pick is only correct relative to a room and a rate. And every one of them is funded by affiliate commission, which is disclosed in full here — picks are selected before links are attached, which is why the skip entries exist.