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Hi, can anyone give me possible reasons for the h/w expansion tank overflowing particularly from cold start up. I have tried the following. 1) Lowered the boiler circulating pump pressure 2) Lowered the hot water cylinder circulating pump pressure 3) Extended the overflow pipe to be about 2.5...

Hi, I would appreciate any help that anyone can give me with this problem. The hot water expansion tank throws out a lot of water particularly when I start up the heating system. There are 2 circulating pumps one at the boiler geound level and one at first floor level. I have tried reducing the...