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Sorry Tony, thats what I meant. Put in an ABV now on two loops. When we extend to 4, it may not be needed.

Thank you for that, PG - I'll get an ABV looked into. I had mentioned to the plumber that we would be extending the system to 4 loops in time when we build the extension. Perhaps he thought this set up would do for now.

Yes. We renovated the house starting 7 years ago and the boiler and UFH went in new about 5. As I say it all works a treat but goes wrong when the UFH is on alone. The UFH on its own is fine if I manually open one of the motorised port valves but that is just turing the CH on isn't it?

Thank you very much for the replies Agile, PG and Simon. I understand the manifold has been supplied 'as is' TRV to the lockshield by Uponor and the plumber has only installed the air vents and gate valves. So I cant see why anything there might be wrong. I'll study the manual on the Vokera and...

Well, I cant seem to find a bypass PG. Funny thing is it has been working just fine until last night. It did do this about a year ago but that was a result of the expansion vessel loosing its charge. Been fine ever since that was replaced.

Thank you for that, PG - Yeah, only one for a very small kitchen and one for the hall. I am looking for the bypass now. Thanks P

Thank you very much for that, PullerGas. I not sure if that is one on the end of the top line. That is on 40. Kind regards P

Good afternoon I have a Vokera Mynute 25 HE which runs very well. HW, CH, and UFH all run no problem. Pressure is good cold and hot. Problem is, if only the UFH is on, it makes a demand for heat and gets it but the boiler not only delivers to the UFH set temp at 45 but gets a little higher...