These radiator fans give a boost to your central heating as they increase the heat output into your space, while being energy efficient.

Usually priced at €115.47, the set of two SpeedComfort Radiator Fans have dropped by 20% to €92.37 for a limited time on Amazon.

The radiator fan from SpeedComfort easily installs without tools, thanks to its magnetic system, and automatically switches on at 33 degrees and off at 25 degrees using a temperature sensor.

The fans save up to 22% on gas costs according to the brand, as they help the radiator heat your space twice as fast, all while saving money on energy bills as you won't need to keep the central heating on as long.

They have a quiet whisper sound, which is compared to the sound of rustling leaves in a tree, and the loss-free adapter consumes no power when the fans are off.

Shoppers who have tried and tested the radiator fans have given them an average rating of 4.2 stars on Amazon.

One customer said in their five star review: "Easy to fit to different radiators and definitely boost the heat around the room."

Another wrote: "This is my second set and they work extremely well and quickly. They operate only when the radiator has reached 30°C and they push the heat around the rooms very quickly. Yes, you can hear the fans but they are quiet.

"The price is very reasonable, especially as the cost of running the fans is very low across the year. In all, these fans are a great add-on to any household. I heartily recommend them."

While a third said: "It was a bit expensive, but well worth it. Going from my last bill, it will have paid for itself this winter. The heating kicks in a lot less and the whole room is much much warmer.

"Functionality is so easy, set them up underneath, clip on the magnet but at the top and plug it in. They are well made and very quite. Also easy to move around if needed. Well worth it."

In a more mixed review, one shopper wrote: "I have several of these. They work well but they are quite noisy. In the evening they have to be turned off because the hum is too loud to ignore."

To shop the SpeedComfort Radiator Fan Duo Set, which are currently 20% off head to Amazon here.