UFH manifold problem
I appear to be having a problem with my Wunda UFH manifold, despite water approx 35’ going into the manifold the water going into the top rail (see pic below) is only approx 23k ?, the TRV is set wide open and the pipework is hot both sides of it. I can only presume that the water is being blended with the cool water from the bottom rail. What stops water from the bottom rail being sucked into the pump rather than returning to the heat source???
Adjusting flow temps per floor is usually dictated by which types of emitters you have, so there is no hard and fast rule there. If screed / slab ground floor, and aluminium spreader plates 1st floor, you 100% need higher flow rates for the spreader plates as the losses from what is a much poorer emitter need to be mitigated against...by increasing the flow temp. I have done many like this, and, for eg, have had to run ~30oc ground and as high as 45oC 1st. Screed over block and beam on both floo
