🗓 Updated August 28, 2026 · EcoBack editorial team
Heating a room of around 40 m² with an electric panel or infrared heater? It works — but only with the right wattage and honest expectations about the electricity bill. Here is the concrete recommendation for 40 m².
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Compiled from public tests & customer reviews — not tested by us. Prices vary; check the current price on Amazon. Illustrations, not product photos. One thing first: size the wattage to the room (60–100 W per m² depending on insulation) and let a thermostat cycle it — running flat out is the expensive mistake. Amazon.de ships to most EU countries, with site and checkout available in English.
Schmidbauer Hybrid Pro 600 W
Infrared plus convection with a stepless thermostat; the manufacturer names 6–12 m² as its range.
Schmidbauer ISP T 700 W
700 W and rated by the manufacturer for damp rooms — the answer to bathroom heating without running a fan heater for hours.
Midea NTH20-17BR
Ceramic fan heater with two stages (1,200 / 2,000 W) — for quick warm-ups, not for continuous heating.
How many watts for 40 m²?
40 m² only works with several panels (2,400–3,200 W in total) — as the sole heating in deep winter it is borderline. Well-insulated new buildings sit at the lower end of the 60–100 W per m² band, old buildings with high ceilings at the upper end.
The full size ladder
| Room size | Heating power | Typical room |
|---|---|---|
| 10 m² | 600–800 W | small office or bathroom |
| 15 m² | 900–1,200 W | home office or small living room |
| 20 m² | 1,200–1,600 W | living room or bedroom |
| 25 m² | 1,500–2,000 W | larger living room |
| 30 m² | 1,800–2,400 W | open-plan living area |
| 40 m² (this page) | 2,400–3,200 W | very large or open-plan room |
| 50 m² | 3,000–4,000 W | very large open area |
Recommended setup for 40 m²
An infrared panel (or set of panels) totalling 2,400–3,200 W with a thermostat fits a very large or open-plan room. The thermostat is where the saving is — it cycles the panel instead of heating continuously. We do not test units ourselves; picks summarise public tests.
✓ No installation, plugs into a socket ✓ Silent, no moving parts ✕ Electricity is an expensive way to make heat
Ad · affiliate link — same price for you. Amazon.de ships to most EU countries, with site and checkout available in English.
Check the price on Amazon.de →What does heating 40 m² cost?
At full power, 2,800 W draws about €0.84 per hour (calculated at €0.30/kWh — put in your own tariff). For a season: with 5 heating hours a day, a thermostat duty cycle of about 40 % and 150 heating days that is roughly €252 per season. The formula is transparent: watts ÷ 1000 × price × hours × duty cycle × days. Electric resistance heating turns one kilowatt-hour of electricity into exactly one kilowatt-hour of heat — that physics is why a heat pump beats it for whole-home, all-winter heating.
Frequently asked questions
How many watts of heating power do I need for 40 m²?
As a rule of thumb 2,400–3,200 W (around 60–100 W per m², depending on insulation). 40 m² only works with several panels (2,400–3,200 W in total) — as the sole heating in deep winter it is borderline.
What does heating with 2,800 W cost?
At full power a 2,800 W heater draws about €0.84 per hour (at €0.30/kWh). A thermostat lowers that considerably, because it does not heat continuously.
What does a heating season cost for 40 m²?
With 2,800 W, 5 heating hours a day, a thermostat duty cycle of about 40 % and 150 heating days you end up at roughly €252 per season (at €0.30/kWh). Recalculate with your own tariff: watts ÷ 1000 × price × hours × duty cycle × days.
Is an electric panel heater enough as the only heating for 40 m²?
Only just — at this size you need several panels, and as the sole heating in deep winter it is borderline. A building heat pump is usually more economical for rooms this large; electric panels remain a zone or supplementary heater.
Matching heating panels for 40 m² on Amazon.de — check total wattage and the thermostat:
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See heating panels →