UFH & Radiators Setup Advice

[JamieB3009]

Hello,

I have a house where the downstairs floor is entirely wet ufh and the upstairs is radiators. The UFH has its own manifold with mixer/thermostatic valve and individual zone controls. The upstairs rads are then on a separate zone. All the system is fed from an ideal vogue system 32 boiler, and there is an unvented cylinder for hot water.

I have the boiler temperature set at about 50 degrees and the UFH outlet temp from the manifold is approx 35 degrees. In the kitchen area i have LVT fitted where i have been advised the temperature shouldnt be above 27 degrees. Using a thermal camera i am seeing approx 27 - 30 degrees on the floor. The LVT has been stuck down using high temperature adhesive (F Ball Styccobond F48 plus) designed for UFH but i am concerned it would be too high. My issue is that the mixer valve on the UFH manifold is as low as it can go and i am getting to the point where if the boiler temp is turned down any lower then it wont be able to heat the radiators. Can anyone advise how best to deal with this? Can you get UFH mixers/blending valves with different ranges? Thanks.

 

[Johntheo5]

If you reduce the flow rate through the manifold then the heat emitted will reduce and should help reduce the floor temperature, do you have flow and return temperature gauges on the UFH manifild and each loop should have a flow meter.

 

[JamieB3009]

Yeah I have now adjusted the pump as it was set at constant speed setting 3 (wilo pump). I have changed this to constant pressure setting 2 and now each flow meter is approx 2 - 2.5 l/min for 100m (approx) loops. Temp leaving the manifold is approx 35 degrees. Will see what effect changing the pump speed/mode has. Thanks for your help

 

[Johntheo5]

What model Wilo??