Room by room
Heating a garage with electricity
The short answer
Most UK garages are uninsulated brick or block with an up-and-over door that leaks air around all four edges. That single fact decides what any heater can achieve in one.
Written and checked by the RapidHeat UK team · Last updated September 2026 · how we work out running costs
Key takeaways
- An uninsulated garage will never feel like a living room — aim to take the chill off a work area.
- Heat the space you stand in, not the whole garage.
- Insulating the door and sealing draughts changes results more than a bigger heater does.
Warm the person, not the building
Bringing a cold, uninsulated 18 m² garage to 20°C takes serious fixed heating and a lot of electricity. Making the corner where you are working comfortable for two hours takes a plug-in heater. Spot heating is not a compromise — it is the sensible strategy for a space you occupy occasionally.
Realistic expectations by garage type
| Garage | Achievable with a plug-in heater |
|---|---|
| Insulated, sealed door, up to 12 m² | Genuinely comfortable in 15–30 minutes |
| Uninsulated single garage, draught-proofed door | Workable at the bench; the far corners stay cold |
| Uninsulated double garage, leaky door | Spot warmth only |
Cheap improvements that pay off
- Brush strips or foam seals around the garage door — the biggest single win.
- Insulation boards on the door panels.
- Board and insulate the ceiling if there is a void above.
- Screen off a working corner with a curtain or partition and heat that instead.
Safety in a garage
- Never run an electric heater near petrol, thinners, aerosols, LPG or anything else with flammable vapour.
- Sawdust and heater grilles are a poor combination — keep the heater clear of the cutting area and vacuum the grille regularly.
- Plug into a proper socket on an RCD-protected circuit, not a coiled extension reel.
- Choose a unit with overheat and tip-over cut-offs, and never leave it unattended.
- Damp garage? Keep the heater off the floor and away from standing water.
Running costs
At a 27p unit rate, a 1.5 kW heater running flat out costs about 41p an hour, so a three-hour session is roughly £1.20. In a leaky garage the thermostat rarely cuts out, so plan on the full figure rather than the optimistic one. See running costs.
Frost protection for stored things
If your aim is keeping paint, tools or a car above freezing rather than working in comfort, a low setting on a thermostat does that cheaply — the same logic as a greenhouse heater.
Using RapidHeat in a garage
RapidHeat is a portable room heater, not an industrial workshop unit. In a smaller or part-insulated garage, used as spot heating at a bench with the door sealed, it makes winter jobs bearable — and it then goes back indoors for the rest of the week, which is more than a fixed heater will do.
RapidHeat ceramic heater
4.8/5 · 1,247 UK customers£49.95· £89.91 for two · £110.89 for three (about £36.96 each)
- Thermostat, timer and remote
- Warm room in about 5 minutes
- Free tracked UK delivery
- 30-day money-back guarantee
Perfect for my cold office
I have a small office with a door that gets really cold because the building management keeps the winter temperature far too low for comfort. I plugged this into the socket above my desk and now I am warm without anyone even knowing it is there. I love it.
Great in the bathroom
We use it to take the chill off the bathroom before the kids' bath time. Warms up fast and the timer is handy. Four stars only because I wish the display were a little dimmer at night.
Worth being straight about: RapidHeat is built for rooms up to about 12 m². It is not a replacement for central heating and it will not transform an open-plan lounge or an uninsulated garage. If it is not right for your room, send it back within 30 days.
Questions people ask
- What is the best heater for a garage?
- For working sessions, a directional ceramic or fan heater aimed at your bench. For frost protection, a low-wattage heater with a thermostat left on a low setting. Bottled gas heaters add moisture and need ventilation, which is bad news for tools.
- Will a 2 kW heater heat a double garage?
- Not to a comfortable temperature if the garage is uninsulated. It will make a bench area workable if you sit close to it and keep the door shut.
- How do I stop condensation and rust on tools?
- Gentle, consistent warmth plus ventilation. Cold metal in damp air is what causes rust, so short blasts of intense heat followed by rapid cooling can make it worse.
- Is it safe to use an electric heater in a garage?
- Yes, if it is plugged into a proper socket, kept away from fuel, solvents, paint and sawdust, and never covered. Do not use a heater in a garage where you store petrol or work with flammable vapours.
Make the garage usable this winter
Order RapidHeat today with free tracked UK delivery and a 30-day money-back guarantee.
Sold direct by RapidHeat UK. Secure checkout, free tracked UK delivery.