Replace an old thermostat

A dated wired thermostat is a common reason to move to a cleaner smart-heating setup.

Serving Brent, wider NW London, and selected West London postcodes. Best first answer: send your postcode, the current thermostat, and any nearby heating controls.

This is for homes where the wall thermostat looks dated, awkward or overdue for replacement, but the thermostat on the wall may only be one part of the full heating controls. The first check is to work out what the old stat actually does, what other controls sit nearby, and whether the chosen smart thermostat looks like a tidy fit or needs a wider check first.

This guide helps separate a simple thermostat replacement from a wider controls issue. The thermostat on the wall is not always the whole system, so the first check is about what the current control actually does and what the replacement needs to work properly.

What this usually means

  • Check the current thermostat, any programmer or receiver, and whether the old control is still doing all the work or only part of it.
  • Check whether the chosen smart thermostat suits the existing control arrangement and the old wall position.
  • Decide whether the sensible next step is a straightforward replacement, a fuller system check, or a tidier solution around the old stat position.

What can change the next step

  • A thermostat swap can stop looking simple once the nearby programmer, receiver, hot-water control or zone setup is seen.
  • A smaller new thermostat can also leave a visible footprint on the wall, so the backplate finish may need discussing before booking.
Official sources and further guidance

Need a quick answer on replacing an old thermostat?

Send your postcode, a few photos of the current controls and any model details for the new thermostat. I’ll confirm whether the next step looks straightforward or whether the heating setup needs a closer check first.