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Thanks Tony. I disconnected the pipework to the tundish and I can see that the leak is definitely from the expansion valve rather than the T&P (original leak was from T&P valve and this was changed anyway on advice from Heatrae). In my opinion the valves are opening as they should due to the...

Thanks for your comments. The warranty has long since expired - it's only the new ones have 25 years. Despite the problem going on for some time (the leak would dry up overnight so it wasn't obvious that there was a problem!) there is no evidence of water leaking from the tank itself. The...

Thanks Toiny, I had wondered about this but was a bit uncertain. Is 12L enough - the tank is 210L? JimG

I have an ongoing problem with my 10 year old Megaflow tank. After approx 6 weeks the air-gap gets reduced to the point where water comes out of the T&P valve when the system heats up. The air-gap has been re-set several times and the result is the same. The T&P valve was replaced on the...