Room heaters compared: oil-filled, fan, infrared and heat pump
All electric heaters turn electricity into heat, but they do it very differently. Here is which type suits which room, and which costs least to run.
2 October 2026 · 9 min read
Chetanya Goel · Founder & Editor
Chetanya started Annam Naturals after two years of keeping a household waste diary. Chetanya writes about the boring, repeatable habits that hold up in a real week.
Most homes in North India have no central heating, so winter means room heaters. Choosing the right type for the room and the way you use it can make a large difference to comfort and to the electricity bill.
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One fact that clears up a lot of marketing
Every resistance heater, whether oil-filled, fan, halogen or infrared, converts essentially all the electricity it uses into heat. A 2,000-watt fan heater and a 2,000-watt oil-filled radiator produce the same amount of heat per hour. Claims that one type is far more 'efficient' usually mean it delivers heat differently, not that it makes more of it. The exception is a heat pump.
Fan heaters
Fan heaters blow air over a hot element and warm a small room fast. They are cheap and portable, but noisy, and the warmth disappears as soon as they switch off. Best for quick bursts in small rooms, like a bathroom before a bath.
Oil-filled radiators
These heat oil sealed inside fins, which then radiate heat steadily. They are slow to warm up but silent, safe to leave on in a bedroom with a thermostat, and keep giving off heat after switching off. Good for steady, long heating of a closed room.
Halogen and infrared heaters
These warm people and objects directly rather than the air. You feel the warmth immediately if you sit in front of one, which makes them efficient for heating a person rather than a whole room. They can dry the skin and eyes if used close up for long periods.
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Heat pumps (inverter air conditioners)
Many inverter split ACs can run in heat mode. A heat pump moves heat from outside to inside, delivering several units of heat for each unit of electricity, so it is typically two to four times cheaper to run than a resistance heater for the same warmth. Efficiency drops in very cold weather, but North Indian winters are usually within their working range. If you already own one, check whether it has a heating mode.
Choosing
- Heat a person at a desk: infrared or halogen
- Heat a bedroom overnight: oil-filled with a thermostat
- Quick warm-up of a small room: fan heater
- Heat a room regularly for hours: an inverter AC in heat mode, if you have one
Cut the heat you need
Seal draughts around doors and windows, use heavy curtains at night, and heat only the room you are in. Our draught-proofing and winter-efficiency guides show how much this can save before you buy anything.
Safety
Keep heaters away from curtains and bedding, never cover them, plug them directly into a wall socket rather than an extension board, and never leave a heater running unattended near children. Never use charcoal or gas heaters in a closed room, because of the risk of carbon monoxide poisoning.
For more of this kind of testing, the eco-friendly product guides hub collects everything we've tried in that area.
Frequently asked
Do I need to buy anything to get started?
No. Every method here begins with what is already in your cupboards. We only recommend a purchase when something has genuinely worn out, and we say what it should cost.
How do you test the things you write about?
Minimum four weeks of ordinary household use, with notes. For anything involving energy or money we use a plug-in meter and record the readings before and after.
Are your recommendations paid for?
Never. Brands cannot buy placement. Some outbound links are affiliate links, which we mark, and they do not change what makes the list.
What if a method doesn't work in my home?
Write to us. A surprising amount of our best material comes from readers explaining why something failed in a flat, a shared house or a very cold winter.
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