I am being told that wet UFH only needs one pump located on the UFH manifold and UFH circuits.
My understanding is that it needs two pumps, one for the boiler circuit and one for the UFH circuits as they are two distinct circuits.
Seeing as you are all experts on circuit arrangements, tell me if the UFH manifold pump can circulate the water through the boiler without a boiler circuit pump installed?
I often see plumbing/heating bods put a circulation pump in the HW supply from the boiler.
Sometimes timed and sometimes constant.
I know that the pumps do not eat many KWs but still it seems to me that running permanent or for hours on end just in case someone needs to draw hot water and not wait "too long" for it to arrive seems poss a waste in many normal instances