Ashp settings

[sirpatchuk]

The radiators seem to get warm enough at 35 degrees flow rate.

The UFH is celotex, spreader plates, chipboard, tiles or carpet.

[crooksey]

I have just looked at your other thread, If I am honest I can see a few issues.

 

You have quite a big pipe spacing, with the UFH not in a screed, with wood flooring floated over the top?

 

UFH works best when pipes are encapsulated in a thermal mass (screed). This retains heat long after the UFH has been turned off, I turn my UFH off and the room stays warm for hours as the heat is retained in the slab. Yours is just heating a void underneath your flooring and wood is not a good conductor of heat. For the most efficient UFH install you would want: PIR insulation, UFH (pipe spacing 125mm if possible), floor screed (50mm min).

 

When your UFH is turning off, your heat will not be stored anywhere as you have no mass to retain it (looking at your pictures).

[ReedRichards]

2 minutes ago, sirpatchuk said:

The radiators seem to get warm enough at 35 degrees flow rate.

 

 

That's excellent.  But if your heat pump is consuming a lot of power just trying and failing to get your UFH up to temperature then either it is keeping something somewhere very hot (giving rise to a poor COP) or there is some other type of fault giving rise to a poor COP.  It doesn't make much sense.