Thanks guys.
I was kind of hoping that when the heating brings the boiler on that I could tee off the flow from the boiler, (the ufh pump would run in line with the CH pump), then the return would tee back to the boiler.
When say, the HW brings the boiler on alone it will just flow past the tee down to UFH loop as the UFH pump wont be running...
Is this bad?? ?