Which? expert shares the exact number your radiators should be on to keep your home toasty and slash energy bills

AN expert has revealed a common radiator mistake that could be costing you extra money - and how to slash the bills this winter in just a second.

As the temperatures are plummeting down to a freezing -14C in some parts across the country, millions of households are switching the heating on to keep toasty.

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But if you're anything like us, the team at Fabulous, and like to blast the heating full on, this one's for you, as a money whizz has revealed why doing this is not necessarily the best of ideas.

According to the gurus at Which?, there's an easy way to cut the costs this winter season - and it's all to do with finding the right number on your dial.

Taking to TikTok, the cash pro explained why you shouldn't have the dial on higher than three ''unless it's in the room where your thermostat is''.

''Whacking your thermostatic radiator valve up to five opens the valve to the max, letting loads of hot water into the radiator,'' the guru noted in the clip.

This, they team member went on to add, is great for times when you want to heat up a room right away and it's perfect for places, such as your living room.

However, if you have every radiator set to five, your heating bills could be higher than they need to be.

''In bedrooms, you should keep the dial between two and three.

''This will keep the room temperature between 15 and 20 degrees, which is comfortable and could save you money.''

The expert also advised to remember to set it to the frost sign for whenever you're going away for longer periods of time, such as a holiday or visiting your friends for a long weekend.

''When your heating is on, it will allow just enough water into the radiator to keep the room above +7C, so your pipes don't freeze.''

So, what do all the number on the dial mean? If your dial is on 0, this means the heating is off.

Meanwhile, the snowflake symbol will keep the radiator on +7C, 1 equals to +10C, 2 will get room to a cosy +15C, 3 means +20C, whilst 4 and 5 equal to +25C and a very hot +30C respectively.

Hundreds of social media users raced to comments to share their thoughts - and it seems that many were left divided by the tip.

One reckoned: ''15C is too cold, you would need a coat on.''

Another agreed, wondering: ''I keep my flat at 23-25, do people really sit indoors at 15C?''

''Is this tip just have the rooms colder than you want them'?'' someone else chimed in.

A fourth penned: ''Got told by a plumber nothing to do with the dial but when you go over 19C to 20C or above that's what heavily increases your bill! My house is 18C.''

Looking for more ways to stay toasty this winter? Social media users have also been raving about a 60p hack using a common kitchen essential.

If you're heading out this weekend, a thrifty mum has also revealed a rather bizarre way to make your fingers and toes warm - and it's all to do with foil. Yes, you read that right.