Last seen: Jun 17, 2025
@tadpole hi. Thanks for the further information. I can see that the reservoir of hot water may have been proposed to feed the two underfloor heatin...
Thats good to hear. One possibility removed. It sounds like the Secondary Return, re-circulation, as described above is a reasonable contender… your...
I think, someone in the past also had a 3 port valve stuck partially open which can mean that while the heating is on the circulating water, at a lowe...
Hi Tadpole I think you’re wise to let the installer and manufacturer fully install and commission before trying to fix anything. However, your 4 ...
@jamespa perfect…. thanks James Added (We tried a number of secondary pump settings until we got the lowest change in DT but we couldn’t do much...
hi Ian, here is my sketch again what do you mean that the DT Is the same both sides? The sketch shows a 1degC drop in one direction and a 1degC rise...
@iancalderbank thanks Ian yes there is a drop in flow temp across the LLH but there is a more or less equal rise in return temp across the LLH. Thes...
Earlier post… from 4 months ago Can anyone help with some maths on estimating percentage of energy loss of DT….? After a summer break we are no...
Thanks For your help... There are a few characteristics which appear to differ from one HP make to another HP make. In this case the relevant charac...
Interesting.... we also have a Secondary pump. However both pumps are external and adjusted manually to reach the desired deltaT however this can vary...
That’s interesting so it sounds like it allows the HP to modulate to a lower output? It’s a little similar to the Mitsubishi Auto adaptive function.
Hi Ant87Im trying to understand how various manufacturers address control of DeltaT. Some heat pumps operate with external primary circulating pumps a...
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