Following on from leak from heating systems very complicated and always take it out from you looking of them. It’s always a struggle trying to looking for a heating leak from an underfloor heating system or radiator heating system. With copper pipes now coming to hitting over decades since they have been installed they are all beginning to start becoming corroded. You have to ensure when conducting a boiler replacement your spend that little bit extra to change over you heating pipes also it may even be easier to replace them over head and isolate the supplies below ground causing less disruption and damage to your property.
Leak sealant is one of our worst enemies when it comes to heating leas ensure not to use any form of leak sealant when looking for a heating leak regardless of who suggests using this. It’s proven to be bad for your system and may cause further problems on your systems further down the line. Heating systems are very temperamental even with you just changing a boiler over from gravity to a mains combi boiler system sometimes the pressure gets a bit too much to handle for pipework resulting in joints coming away far too common problem we get a lot of these call outs.