De'Longhi TRDX41025E Oil Filled Radiator, Dragon 4

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Read our full story on illegal and dangerous plug-in mini heaters for sale on online marketplaces to see those we identified as having serious safety risks. Keen to optimise home heating? See our advice on boiler controls and thermostats , smart meters , and loft insulation

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The best electric radiators you can buy in 2023 1. De’Longhi Dragon 4 TRD40820T: Best all-round electric radiator In our tests, we set every heater to run at full blast so you can see the maximum amount it cost to heat our medium-sized test room. If you have the thermostat of your heater set to a desired temperature, the heater will toggle on and off once it reaches that temperature – depending on what's needed to maintain it. The heater won't operate continuously, so won't cost you as much to run. Are electric heaters cheaper to use than central heating? New enlarged battery design: The 25% larger radiant surface ensures a faster air flow emission and increased chimney effect which means better comfort Portable electric heaters use electricity, which costs 27.35p/kWh under the current energy price cap. Depending on how effective the heater is, they can take anything from 30 minutes to an hour to notably raise the temperature of a medium-sized room, so if you're only planning on using it until the room gets up to temperature, it will likely cost you between 28 and 55p. 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.

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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.

Best electric radiator 2023: Banish the chills with these

Cold air setting Some fan heaters can help cool you down too. They're not nearly as effective as a dedicated air conditioner, but a light breeze of cold air is better than nothing. 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.

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We've put electric heaters from Argos, Dimplex, DeLonghi, Dyson, Russell Hobbs and more to the test, including electric wall heaters, fan heaters, oil heaters and convectors.

Delonghi Dragon 4 PRO 2.5kW Digital Oil Filled Radiator with

Some portable heaters have useful extras, such as an LCD screen that displays the current temperature or a remote control for turning the heater on from across the room. These features may come in handy:Due to the long list of factors that come into play to calculate your central heating costs, the only way you can confidently compare a heater to your central heating is to install a smart meter. You then divide your weekly heating cost by the number of hours you have it switched on and compare that figure to the cost of running your heater. The oil in the radiator acts as a heat reservoir, which stays hot for some time after the heater's switched off. Some are called 'oil-free' and function in a comparable way, just with an internal heating element instead of any oil. This impressive slim-line Dragon 4 radiator from De'Longhi is perfect for large rooms or spaces up to 75 m³. It has a powerful 2500 Watt output and 3 heat settings, making it easy for you to find the ideal temperature and stay toasty warm. It boasts an increased radiant surface that delivers better and more evenly spread heat distribution - faster! Cost per hour is based on using the heater on its highest setting as, following our testing, we think this is the setting you're more likely to use. Calculated using the unit price under the current energy price cap (27.35p/kwH). We're not able to show every retailer and cheaper prices may be available. The electric heaters we tested