How can I save more?
Reduce flow temp to 60
Many combi boilers are factory-set higher than they need to be, to a high 75°C or 80°C, which stops the boiler from running efficiently. Turning down the flow temperature on your combi boiler to 60°C or below can knock £57 off your heating bill each year, allowing the boiler to recover and reuse heat that would otherwise be wasted through the flue. But almost a third of gas households are missing out on this saving (29%). This setting means that some homes might take longer to heat up to the desired temperature and may slightly reduce the temperature, with a minimal change to comfort.
Turn off the pre heat facility
Some combi boilers keep an amount of water heated up when it is not in use. Turning this off can save money, and your water will still stay consistently hot when it is needed. Alone, this measure can save individual gas households £7 a year.
Readjust TRVs outside living room to 1.5 degrees cooler than before
Thermostatic radiator valves (TRVs) can reduce energy bills by allowing you to control the temperature of each room individually. They work by adjusting the flow of hot water into an individual radiator based on the surrounding indoor air temperature. Making a slight 1.5°C change outside the living room by changing the radiator setting from 5 to 3 will not reduce comfort, but it will save money while ensuring that the most well-used room stays at the same temperature. Alone, this measure can save individual gas households £41 a year.
Reduce thermostat temperature to 19
A home heating thermostat measures the air temperature and automatically turns a boiler or heating system on and off to keep a home at a steady, comfortable level. Turning this down slightly to 19°C (from 20°C) can help save money while comfort often stays the same. Alone, this measure can save a typical gas household £67 a year if the temperature is reduced from 20°C. Further savings can be gained by reducing the temperature more but the World Health Organisation warns against heating homes under 18C.
Close curtains at night
Around a third of Brits don’t close all the curtains in their home at night, despite this helping save energy. The curtains act as a barrier, preventing heat from escaping through the window and keeping the home warmer for longer. Alone, this measure can save individual gas households £7 a year.
Shorter heating season (Oct-March)
With 2027 predicted to be one of the hottest years on record, turning the heating off before April, when the weather is milder, can help you save even further. April 2026 saw spikes in temperature and it was the hottest early-April temperature recorded since 1946. Try turning the heating off as the clocks go forward at the end of March and save on energy bills. Alone, this measure can save a typical gas household £65 a year.
To get a final total, the savings by each measure are not simply added together as measures interact in complex ways.