In 2022, Nesta launched a campaign to help households save money by lowering the flow temperature on their condensing combi boilers to 60°C. This report summarises the evidence underpinning Nesta’s Money Saving Boiler Challenge campaign.

Our evidence suggests that households could save about 9% on their total gas bill by doing this, assuming their flow temperature is currently set at 80°C.

We’ve based our stated 9% gas bill saving, and the advice to lower to 60°C, on multiple sources of evidence. Findings from real-world experiments and modelling both point toward a similar gas saving and similar impacts on room temperature.

Nesta is confident this advice will have a positive impact on households with combi boilers across the UK by helping them reduce their gas consumption and bills. It will also contribute towards lowering the UK’s household carbon emissions.