But experts say a common mistake with boiler temperature settings means many families are wasting even more money without realising. Most modern homes have a condensing combi boiler designed to run efficiently at lower flow temperatures. However, Wallis warns that this change is most effective for homes with combi boilers and reasonably well-insulated properties. Recommended reading:He says: “If you have a hot water tank system or an older boiler, do check with a qualified engineer first. But for most modern combi boilers, this is a very simple and effective adjustment that households can make themselves.”Households are also advised to check their hot water temperature setting, as this is often set unnecessarily high.

Source: The Herald December 19, 2025 15:13 UTC