In this guide 5 sections
Too small a heater and the room never gets warm. Too big and you pay for power you do not need — and may trip your wiring or UPS. Here is a simple way to size a heater for a Pakistani home.
The rule of thumb
For whole-room heating in a closed room with normal ceilings, allow about 10 watts per square foot. Measure length × width in feet: a 12 × 14 ft room is 168 sq ft, so it needs about 1,700 W. Add a little for ground-floor rooms, corner rooms, single-glazed windows or very cold cities.
Room-size table
| Room | Area | Whole-room heater | Spot heater (for sitting) |
|---|---|---|---|
| Small study / hostel room | up to 80 sq ft | 500–800 W fan or plug-in | 300/600 W sun heater |
| Normal bedroom | 100 – 150 sq ft | 1,500–2,000 W fan heater or 9-fin radiator | 600 W sun or 800 W rod |
| Large bedroom | 150 – 220 sq ft | 2,000–2,200 W fan / ceramic or 11–13 fin radiator | 900 W dish or stand |
| Lounge / drawing room | 220 sq ft + | 2 heaters, or 2,500 W radiator | Oscillating stand heater |
Spot heating changes the maths
If you only need to be warm where you sit, you do not need to heat the whole room at all. A 600 W sun heater or an oscillating SG-06 stand heater warms a sofa of people in a big lounge for a fraction of the power.
Step by step
- Measure the room in feet and multiply length × width.
- Multiply by 10 to get watts for whole-room heating.
- Check your socket and UPS can handle it.
- Pick a heater with two settings and a thermostat so you can turn it down.
Things that make a room need more heat
- Ground floor or a room above a garage.
- Big windows or gaps under doors.
- High ceilings.
- Cold cities — Quetta, Islamabad, Murree, Peshawar.
Browse fan heaters, oil radiators or all electric heaters.
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