• Boiler type: Combi boiler. Ideal independent +C24

Customer description

My boiler seems perfectly fine in general but there is a small quirk whereby when I shower, this causes the hot water to run through all the radiators in the house even if the heating isn't on. I talked to someone on a different job who couldn't squeeze me in who told me that most likely there is a faulty valve. If you think you can quote and fix for a reasonable price, given no major issue, please let me know. I am located in crystal palace.