Cheapest Way to Heat One Room
The cheapest answer depends on what comfort problem you are solving. If you only need to keep one person warm, personal heat is usually far cheaper than heating all the air in the room.
Updated March 2026. Default rate effective 1 April 2026 (Ofgem Q2 2026).
Practical answer
Use an electric blanket or another personal-warmth option whenever that genuinely solves the problem. Move to a room heater only when you need the whole room comfortable, and then keep the heated period as short and focused as possible.
Typical cost comparison
| Appliance | Basis | Typical cost | Annual cost | Annual use |
|---|---|---|---|---|
| Electric Blanket | Typical hour | 2.5p | £71.54 | 292.00 kWh |
| Electric Heater | Typical hour | 49.0p | £715.40 | 2920.00 kWh |
These estimates cover electricity only. They do not compare gas central heating costs, and they assume typical domestic use rather than medical or specialist heating needs.
Warm the person before the room
If you are sitting still, working at a desk, or getting into bed, whole-room electric heat is often the expensive answer. Personal warmth is usually the first thing to test because it targets the comfort problem directly.
That does not mean a blanket replaces room heat in every situation. It means the bill difference is so large that it is worth deciding deliberately rather than reaching for the heater by habit.
If you do use a room heater
Hours of use matter more than almost anything else. Cutting a four-hour session to two focused hours can save more than choosing between similar heater brands.
Close doors, warm the room you are actually in, and use timers so the heater does not quietly become an all-evening background appliance.
Where comfort beats pure cost
A room heater may still be the right choice if you need to move around, get dressed, dry a damp room, or create general comfort for more than one person.
The aim is not to avoid heating. It is to use the expensive option only when you really need room-level comfort rather than personal warmth.
Cheapest Way to Heat One Room FAQs
Common questions about electricity costs and our calculators.