Over 25 degrees ......

When you increase the temperature limit between 25-30 degrees ?


  • FrankFrank | Admin

    Hi leonard1968,

    There are several reasons for the maximum limitation of 25°C.

    • Some boilers require an absolute set-point value from the thermostat (digital interfaces) and will not accept a value above 25°
    • For every degree above 25°, the amount of energy used starts to increase exponentially
    • And finally, extended exposure to temperatures higher than 24-25°C can have considerable negative health impacts.

    You can enter an offset to trick the thermostat into thinking it is colder so it would heat longer (doesn't work in the first noted situation though), but it would be more advisable to instead wear warmer clothing. Here's a great article from the BBC about this: https://www.bbc.com/news/magazine-12606943

    Best regards,


  • @Frank yes but... Some people need it warmer than 25C. It may not be energy efficient etc, but when you have an elderly relative who's already wearing two jumpers and is still cold....
    If you have to lie to the boiler, so be it.
  • It could be argued that needing to run the thermostat so high might be indicating extremely poor insulation and/or drafts.

    There might also be a case of radiators being too small a capacity for a room so that only the part of the room right next to the radiator receives sufficient heat. (I believe that on average radiators are usually actually too high a capacity for rooms.)

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