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But that wouldnt explain why it has only just starting to do it. The owners is adamant that they used the UFH more then the heating and it defo didn't do it before?
 
so the heating doesnt come on with the hot water at all?
 
To be honest I thought it was a normal unvented but when I said to a work mate the 2 port was open all the time when there was 240v present he was the one that said thermal store so I went with it.
 
That's what I thought but my G3 knowledge is tiny

TBH I would get the underfloor up and running and get it into fault state and see if the other side of the valve is hot if it is close the valve and do the rads cool etc
 
I have tried that also mate and turned off the temp valve to min on the UFH valve and they still get hot. I have noticed that the pump for the UFH is on the flow though if that makes a difference?
 
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