Save on Heating Bills by Lowering Boiler Temperature
Lowering your boiler flow temperature is one of the easiest ways to cut heating costs. Each 1°C reduction saves approximately 3% on your gas bill, so a 10°C drop can cut your heating costs by around 30%. Modern condensing boilers work most efficiently at lower flow temperatures, making this a win-win for both your wallet and the environment.
To maintain comfort, try reducing the temperature gradually by 2–3°C at a time and observe whether your radiators still heat rooms adequately. Also ensure the boiler temperature stays above 50°C to prevent Legionella growth in hot water systems.
Frequently Asked Questions
It is a widely cited industry estimate. Actual savings depend on your home's insulation, radiator size, and outside temperatures. Better-insulated homes may see larger savings.
Slightly, if radiators are undersized. Most modern radiators can compensate for a 5–10°C flow temperature reduction without noticeable comfort loss, especially in well-insulated homes.