A consumer expert from Which? has warned that a boiler setting left too high at home could waste "hundreds of pounds" in energy costs. The issue, described as one of the "most common heating mistakes" Brits make, can be fixed in seconds.
The boiler setting that wastes money
In an Instagram post, the Which? expert explained that combi condenser boilers often have their flow temperature set too high, wasting energy almost instantly. Standard UK boiler systems typically allow users to adjust this setting, which is frequently left at 70 or 80°C as water leaves the boiler and heads to the radiators.
Which? suggests that most people could save energy by lowering the temperature to 60°C. This is different from room temperature, which is controlled by a thermostat. If rooms are set to reach, for example, 21°C, they will still do so, though it may take a little longer.
How to lower the flow temperature
The Which? expert noted that a lower flow temperature makes the boiler more efficient, "spewing less wasted heat out of the flue." However, the right temperature depends on the building, and fine-tuning throughout the year is recommended. Those with hot water tanks should avoid making changes unless they get expert advice.
To adjust a combi condensing boiler, users should head to the front panel. Most models have a screen, button, or dial to control the flow temperature. Which? advises looking for "a little picture of a radiator" to ensure the correct setting is being changed. Before adjusting, it is best to take a photo or note the existing temperature so it can be changed back if needed.
