De'Longhi TRDX41025E Oil Filled Radiator, Dragon 4

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Some modern options also have smart features so you can program them via companion apps and smart speakers.

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Programmable timer Useful for setting a heater to turn on just before you get home or wake up, so there's no waiting around for the heater to warm up. Buy It Direct Ltd is a limited company registered in England. Registered number 04171412. Registered office: Unit A Trident Business Park, Leeds Road, Huddersfield, West Yorkshire, HD2 1UA. You don't have permission to access "http://www.argos.co.uk/browse/appliances/coffee-machines/c:29562/" on this server.

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These have exposed heating elements, which heat up cold air as it passes. This often leads to slower, but more even, heating. They tend to be a little slower than fan heaters, but are quieter, and our tests found some are still pretty speedy.

Best electric radiator 2023: Banish the chills with these

Keen to optimise home heating? See our advice on boiler controls and thermostats , smart meters , and loft insulation

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Need to know Three power settings, digital display, remote control, wheels, 180cm cable, programmable timer (1-24 hours), one lip handle at one end on the top New enlarged battery design: The 25% larger radiant surface ensures a faster air flow emission and increased chimney effect which means better comfort

Delonghi Dragon 4 PRO 2.5kW Digital Oil Filled Radiator with

Frost protection The heater can be set to heat automatically when the temperature drops below 5°C, but you'll need to have it on standby for it to run, so this can limit its usefulness. For a small room or outside office, you can probably get away with a 600W to 800W radiator. For an average-sized room or conservatory, you might want to look at 1,500W to 2,000W. If you’re heating larger rooms or a chilly conservatory, you should go to 2,000W and above. This figure is calculated by taking into consideration the dimensions of your room (width, length, height) and the type of windows (such as single or double glazing). You can either use one radiator to reach the total BTU level required, or a number of radiators which reaches the required BTU level when added together - let's get to it! Why do I need to work out my BTU?All electric radiators will have a thermostat and controls to set the output level and temperature. On some models, these will be simple analogue dials and switches, while others have digital controls. It’s also worth looking for some kind of timer with which you can set the radiator to turn on and off automatically. Adjustable thermostat Using this function, a portable heater will heat the room and when the desired temperature is reached, it will try to maintain the room at that temperature. Most of the cheaper, simpler heaters we tested have a dial thermostat that doesn't let you choose specific temperatures in °C. You'll likely need to buy a more expensive model for that. Our tests also found that they're rarely 100% accurate and will probably think the room is a couple of °C warmer or cooler than it is.