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Thanks oldbuffer. The system is underfloor heating. No radiators available. I found this isolation valve online. Thoughts...

Actually is leaking from the isolation valve at the top where the black plastic bit is. There is a screw on top, but that is to tighten up the plastic.

The leak is minimal, but could be the culprit.

Regularly losing pressure. I noticed there is a leakage at the end that connects to the boiler. Although it may be something else less obvious I am thinking simple, change this connector and see if the pressure issue continues. The self release valve inside the boiler was changed, but that...

Thank you that helps. Here is a picture of the system. I believe the valves would be closed when the system is off as you said. Do you know how much water will come out of the boiler? Just wondering if a bucket is enough.

Hi I have a similar issue with the filling loop. I have underfloor heating, but I am a bit unsure if I can just follow this approach. Do you know if by removing the filling loop the water in the underfloor heating would be affected? It may be simpler than I think, but I dont want to take any...