The boiler supplies the house with two water supplies: one for taps and the other for heating. Most boilers have two dials that can be used to set the two temperatures separately. A higher temperature means more heat, which requires more gas. This means you’re paying more and emitting more carbon dioxide!
The optimum position for the dial for the radiators should be set to between 60-65°C for maximum efficiency. Going outside that region can decrease efficiency by up to 10-20%. That is equivalent to £10 per person, in addition to 290 kg of CO2 a year! Lowering the temperature means it takes longer to heat your house and it will have to be heated for longer.
Some boilers will have an ‘e’ marking their most efficient point on the dial - look for this on your boiler!
Tap dials must be set to above 60°C to prevent the build up of Legionnaire’s bacteria that can cause pneumonia!
In addition, boiler temperatures may have digital interfaces. If in doubt, Google the boiler’s name to find a tutorial for setting the temperature.
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