The best electric fireplaces for large rooms

This is the real answer to the question, and it comes with a condition that most of the internet leaves out. Dimplex publishes three ratings for the RBF36 depending on supply: 1,375 W / 4,435 BTU at 120 V, 1,975 W / 6,739 BTU at 208 V, and 2,575 W / 8,786 BTU at 240 V.

That top figure is roughly 72% more heat than any plug-in unit can deliver, and it is the concrete proof of something we say everywhere else on this site: to exceed 5,118 BTU per hour you need 240 V hardwired equipment, which is a different product category with an electrician attached to it. Physical specs are 37 1/8 by 26 5/8 by 12 1/8 inches at 60 pounds.

Two honest cons, and the first is the important one. On an ordinary 120 V outlet this produces 4,435 BTU per hour — less than a standard $200 plug-in unit. Buy it, plug it into a normal socket, and you have paid a premium for less heat. The 240 V performance requires a dedicated circuit, a licensed electrician and in most places a permit. Second, at 12 1/8 inches deep it is a built-in firebox needing a purpose-built enclosure, not something you cut into a wall.

What it does not do: On an ordinary 120 V outlet this produces 4,435 BTU/hr — LESS than a standard 1,500 W plug-in unit. The headline 8,786 BTU figure requires a 240 V hardwired circuit, which means an electrician, a dedicated circuit and in most places a permit.

Dimplex publishes 31 1/8 by 26 5/8 by 12 1/8 inches at 50 pounds, with heat output quoted up to 8,794 BTU per hour on the higher-voltage configuration — essentially the same thermal ceiling as the 36 in a narrower box.

For a large room where the wall cannot take a 37-inch firebox, this is the same strategy at a smaller footprint. The flame is the Revillusion mirror-free viewing area with a herringbone brick interior, which is a genuinely different look from the linear units elsewhere on this site.

The cons are identical to the RBF36 and they are not small: the headline BTU figure needs a hardwired higher-voltage supply, and the 12 1/8 inch depth means a framed enclosure rather than a stud bay. Neither is a weekend job.

What it does not do: This is a firebox, not a plug-in wall unit. At 12 1/8 in deep it will not go into a 2x4 or even a 2x6 wall — it needs a purpose-built enclosure. The higher BTU figures require a higher-voltage hardwired supply and a licensed electrician.

If you are staying inside the plug-in category — and most people should — then delivery is the only lever left, and this unit pulls it twice. Infrared radiates onto people and objects instead of relying on air movement, and wall mounting at seated chest height puts that radiation where people actually are.

In a large room both matter more than they do in a small one. Convection has to cross the whole space to reach you and loses on the way; radiant heat travels in a line to whatever it points at. Published figures are 60 by 18 by 4.6 inches, 56.2 pounds, 1,500 W, 5,118 BTU per hour, 12 flame colors and 13 ember-bed colors, WiFi with Alexa and Google.

The con is the one this whole page exists to state: it does not solve your problem, it manages it. In a 480 square foot room this is still roughly half the BTU the space wants, and it will warm the seating area rather than the room.

What it does not do: WiFi and a crackle speaker are the upgrade here. The heater is the same 1,500 W as a unit costing a fraction of it. At 4.6 in deep it will not sit flush in a standard 2x4 wall.

Duraflame rates this log set for supplemental heating up to 1,000 square feet — the biggest coverage figure of anything we cover. It is infrared quartz, which is the right technology for a masonry recess because convection struggles to escape a brick firebox before it warms the brick.

For a large room that already has a fireplace, this is the cheapest meaningful improvement available: it drops into the opening, needs no framing, and puts radiant heat into the room rather than into the chimney breast.

The con is how that 1,000 square foot number must be read. It is a supplemental-heat rating — what the appliance can contribute to a space heated by something else — not a claim it will hold 1,000 square feet at temperature. At 1,500 W it produces the same 5,118 BTU per hour as everything else, and 1,000 square feet wants roughly 20,000.

What it does not do: The 1,000 sq ft figure is the manufacturer's supplemental-heat rating, not a claim that it will hold temperature in a 1,000 sq ft room. See our BTU page for what the wattage actually buys.