Electric Heating —
Panel Heaters, Radiators & Towel Rails

As a rule of thumb, allow 80–100 W per m² for a well-insulated room with double glazing, and 120–150 W per m² for older or poorly insulated rooms. A 12 m² bedroom typically needs a 1.0–1.2 kW panel heater or oil-filled radiator. For bathrooms, add a heated towel rail sized to the wall space rather than the room area — comfort and drying capacity matter more than raw kW.