Thanks everyone
Yes it's a gravity system
It's the main cold water tank ( not the heating One)
I have not tried to blow down the vent pipe. What could be blocking it?
Any advice would be extremely appreciated. I have an indirect heating system. A few days ago the large cold water tank overflow started to leak. Given that I had the ball-cock replaced 6 months ago I kinda knew it was not the problem - it was not.
When the water is being heated on its own it...
Cheers again Simon
I only want to reduce the amount of times it fires. Thanks again will keep it at 12-15c and see what happens over winter. At least I know it will not mean frozen pipes.
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