# What size electric heater for 15 m²? Wattage guide

> What size electric heater for 15 m²? Recommended: 900–1,200 W (60–100 W per m²). Running cost about €0.32/h and the honest season maths.

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Heating a room of around 15 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 15 m².

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**Quick answer:** For 15 m² you need about **900–1,200 W** of heating power (rule of thumb: 60–100 W per m², depending on insulation). At full power that costs about €0.32 per hour at €0.30/kWh — a thermostat brings the real-world figure well down.

## How many watts for 15 m²?

15 m² needs around 900–1,200 W — depending on insulation, one larger panel or two small ones. 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](https://getecoback.com/en/guide/electric-heater-10-sqm.html) | 600–800 W | small office or bathroom |
**15 m² (this page)** | 900–1,200 W | home office or small living room |
[20 m²](https://getecoback.com/en/guide/electric-heater-20-sqm.html) | 1,200–1,600 W | living room or bedroom |
[25 m²](https://getecoback.com/en/guide/electric-heater-25-sqm.html) | 1,500–2,000 W | larger living room |
[30 m²](https://getecoback.com/en/guide/electric-heater-30-sqm.html) | 1,800–2,400 W | open-plan living area |
[40 m²](https://getecoback.com/en/guide/electric-heater-40-sqm.html) | 2,400–3,200 W | very large or open-plan room |
[50 m²](https://getecoback.com/en/guide/electric-heater-50-sqm.html) | 3,000–4,000 W | very large open area |

## Recommended setup for 15 m²

Electric heating · 900–1,200 W
An **infrared panel (or set of panels) totalling 900–1,200 W** with a thermostat fits a home office or small living 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

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## What does heating 15 m² cost?

At full power, 1,050 W draws about **€0.32 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 **€94 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 15 m²?**As a rule of thumb 900–1,200 W (around 60–100 W per m², depending on insulation). 15 m² needs around 900–1,200 W — depending on insulation, one larger panel or two small ones.

**What does heating with 1,050 W cost?**At full power a 1,050 W heater draws about €0.32 per hour (at €0.30/kWh). A thermostat lowers that considerably, because it does not heat continuously.

**What does a heating season cost for 15 m²?**With 1,050 W, 5 heating hours a day, a thermostat duty cycle of about 40 % and 150 heating days you end up at roughly €94 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 15 m²?**As a supplementary or transition-season heater, yes. As the sole heating in deep winter, a building heat pump is usually more economical — electric resistance heating turns every kilowatt-hour of expensive electricity into exactly one kilowatt-hour of heat, no more.

**Matching heating panels for 15 m² on Amazon.de** — check total wattage and the thermostat:

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See heating panels →

**More guides**
[What size dehumidifier for 15 m²? →](https://getecoback.com/en/guide/dehumidifier-15-sqm.html)
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