I've just got back from hols to find the CH expansion warning pipe
dripping and algal?sp growth on the lean-to roof as a result so it had
obviously been dripping for some time. The boiler had been off while we
were away. I decided to leave investigating until today but magically
the dripping has stopped now that the boiler has been run a few times
for hot water. Why'd that happen?
The ball-cock has been exercised and the washer is sealing better?
Worse case is your pimary coil in your hw cylinder has a small leak and this
is normally not noticed when you're drawing off hot water.
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