I had a new cylinder fitted in December 2009 and the plumber also upgraded the 3way valve to an electric one. A cyclinder thermostat was also added and a room thermostat installed in my dining room. What I now get is when the domestic hot water is being heated, straight from the outset, a stream of water is ejected into the overflow tank. This doesn't occur when the heating is on on its own. What I then have to do is bail out the excess water every 5 days otherwise it just overflows out of the loft overflow pipe. I recalled the plumber and he has turned down the Grundfos pump to setting 2 but this doesn't seem to have made any difference. I have been waiting for 2 months for him to return but I'm now getting anxious that he may not! Can anyone give me advice on what to do next. Thanks

Basguy, March 2010

can be many reasons.
without seeing the boiler,pipework layout and seeing the general running of the system
can't pin point what the cause is
so many questions need asking we could be here for ages.

best get someone in to have a look.

hi-spec plumbing & heating (essex), March 2010