Exact number radiators dials should be on to 'save on heating costs' and stay warm

In a bid to tackle soaring energy bills, particularly with the Energy Price Cap set to rise in January, the Energy Savings Trust has disclosed the optimal setting for radiator dials. From January 1 to March 31, 2025, households will see an increase in the Energy Price Cap, meaning the cost of each unit of gas and electricity will climb.

Additionally, the daily standing charge for these utilities – the fixed cost for supply – is also on the up. In essence, from January onwards, consumers will be shelling out more cash for the same level of electric and gas consumption as before.

Homes with central heating typically feature radiators equipped with a thermostatic radiator valve on the side, usually marked with numbers ranging from zero to six to adjust the heat output. The Energy Savings Trust explained: "Thermostatic radiator valves work by sensing the air temperature around them."

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They added: "If the room is warmer than the setting on the TRV, the valve will close a little. This reduces the volume of hot water flowing into the radiator."

Moreover, "If the room temperature is lower than the valve setting, the valve opens, increasing the flow of hot water into the radiator."

To cut down on energy costs while maintaining a comfortable home environment, the Energy Savings Trust advises setting the radiator dial between three and four.

According to the not-for-profit organisation, this range is ideal for "rooms you use the most".

For bedrooms and less frequented living spaces, dialling radiator valves down to settings between two and three is the way to go. "You should aim for the lowest setting that keeps the room at a comfortable temperature," advised the charity.

"Doing this will reduce the volume of hot water flowing into the radiator, using less energy and saving you money."