Cylinder Thermostat Replacement

What cylinder thermostat replacement covers

This service focuses on restoring correct hot water temperature control on your cylinder. It typically includes:

• Checks to confirm the thermostat is the cause of the fault
• Safe isolation of electrics where required
• Removal of the faulty thermostat and fitting of a like-for-like replacement
• Setting the correct operating temperature and verifying the cut-out
• Functional testing to confirm stable hot water temperatures
• Advice on safe temperature settings and what to watch for next

When this service is the right fit

Cylinder thermostat issues are often suspected when hot water:

• Runs scalding hot or the cylinder seems to overheat
• Never reaches temperature, or goes cold quickly
• Fluctuates from day to day
• Triggers an immersion heater reset, fuse, or breaker

It is also relevant if you are diagnosing intermittent hot water problems and want a clear, practical fix rather than repeated guesswork.

How the work is carried out

The thermostat type and cylinder setup will dictate the exact steps. The engineer will confirm compatibility, isolate supplies, replace the component, then test operation under normal demand. For unvented cylinders, work is carried out in line with the system’s safety requirements and only by suitably qualified engineers.

After the replacement

Once fitted, you should get more consistent hot water temperature and fewer nuisance trips. If testing suggests another fault (such as an immersion heater issue, wiring problem, or safety device operation), you will be told what was found and what the sensible next step is.