Our Willis heater based UFH doesn't seem to be working as advertised. The problem as far as I can see it is that the flow rates through the various UFH loops are nowhere near high enough and I can't get them any higher.
We have a total of 11 loops and as I understand it the flow rate through the various UFH pipe loops should be 0.5 litre/min per 20m pipe, so for example one of our pipe runs is 90m long so it should have a flow rate of 2.25 litres/min.
First question, is the above correct?