De'Longhi TRDX41025E Oil Filled Radiator, Dragon 4

Product Information

The oil in the radiator acts as a heat reservoir, which stays hot for some time after the heater's switched off. It's important that you get to grips with what BTU you will need in your room as you want to achieve the goldilocks effect – not hot, not cold but just right!

Best electric heaters 2023 - Which?

Key specs – Heat output: 2,000W; Controls: Five heat settings, power level, analogue timer; Extra features: Anti-frost, overheat cut-out; Dimensions: 440 x 640 x 160mm; Weight: 15. On some models, these will be simple analogue dials and switches, while others have digital controls. Central heating is much more effective at maintaining a stable temperature over a longer period, whereas the heat from an electric heater will soon dissipate if the rest of your home is cold.Key specs – Heat output: 2kW; Controls: Adjustable thermostat; Extra features: Overheat protection, tip-over switch; Dimensions: 435 x 135 x 665mm; Weight: 9. Key specs – Heat output: 700W; Controls: Adjustable thermostat; Extra features: Frost protection, safety cut-out; Dimensions: 290 x 446 x 194mm; Weight: 5. 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.

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While some heaters can be used straight out of the box, others have complicated program and timer settings. Its slim design, front and back carry handle and pre-assembled soft rubberised wheels ensures practicability, manoeuvrability and easy storage in the warmer months. Key specs – Heat output: 2kW; Controls: 2x heat level switches, adjustable thermostat; Extra features: Safety thermostat; Dimensions: 472 x 160 x 650mm; Weight: 12. However, oil-free radiators are often faster to warm up and lighter and easier to carry around while still being very cost-effective. The higher the output, the more heat the radiator can dish out and – generally speaking – the larger it will be.The wattage isn’t the be-all and end-all, though, as different designs will be more or less efficient at distributing heat through the room. 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. While radiators do radiate heat, a lot of it is spread through convection and manufacturers have found a range of different approaches to improve how well this works. They can even be useful if you just want to keep one room warm after the central heating system turns off for the night.

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There are a lot of electric radiators to choose from, and since most designs are relatively simple, it’s hard to get a really bad one. Each of the smart heaters we've tested have been internet security tested, and at the time of publishing each provides an adequate level of protection.

For electric heaters with programmable thermostats, we set them to a specific temperature and compare the temperature display on the electric heater to our own temperature monitors to check for any discrepancies. We also time how long it takes the radiator to warm one test room from cold to a comfortable 20°C, and use a passthrough power meter to check the energy consumption at full power, half power and anti-frost power settings. Brackets and instructions for wall mounting are usually included, but you'll need to drill holes in your walls. They tend to be a little slower than fan heaters, but are quieter, and our tests found some are still pretty speedy.