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Last seen: Oct 19, 2026
Good I guess these operate the actuators on each loop but maybe one on each manifold operates the zone valve? If tyhere is nothing else to set high ...
No, that wouldn't account for the flow temp being lower than the return temp. This shows that the water pump continues to operate and as a result the...
I think what will actually happen is that the deltaT from flow to return will decrease. There may be a slight increase in energy to the house (becaus...
If they arent permanently open then yes they would cause a problem (unless they are all wired to close simultaneously when the DHW comes on - instead ...
Sofaik all others do the same, ie they operate the refrigerant circuit in cooling mode to effect defrost. They thus cool the house and warm the heat ...
Are you sure. Where does the defrost energy come from on that case? Most stop the fan but leave the primary pump going thus extracting the defrost ...
Personally I would want them inside the heated envelope if possible. Then the heat loss is useful during the heating season. Obviously its a bit sit...
I persuaded my installer that heat loss from the adjacent hallway plus steam when you actually take a bath/shower was sufficient (in order that we did...
@sandman1600 just looking at the plots here it looks to me like there is in fact a range of outside temperatures where it does not cycle, casting doub...
If you think your heat loss is between 4.5 and 8.5, the r290 is probably a goodun because of its.unusually large modulation range, due to having two c...
Further to the above here is a template for what you might say if you wish to decline sign off. ? indicates info from melcloud or elsewhere, or refer...
I should add that I still think you can get it working well as it is, so if you don't think it's worth trying to press the installer then let's focus ...
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Degrees of Separation
Latest Posts
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RE: Renewables & Heat Pumps in the News
The irony is there's already an established internation...
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15kw pump for 225m2 1990's house - over kill?
Good evening. I am looking at switching from an oil-bas...
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First you need to know how much thermal energy you'll n...
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RE: How quickly would you want/expect heat recovery to take from setback?
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RE: Renewable Heating Hub Homeowners' Q&A Podcast
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RE: How should the Boiler Upgrade Scheme be reformed?
Not quite, regular A2W heat-pumps need a load of extra ...
By Temperature_Gradient , 3 days ago
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RE: Heat Geek installations: share your experiences
one thing i learnt from reading people’s comments and e...
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RE: Cooling/heating with one unit
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
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Bufferless design & control of Chinese air to water monoblock hybrid heat pump in Alberta, Canada
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The installer visited yesterday and suggested the noise...
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