Help me keep the faith with my air source heat pump installation

AdamK · 2025-03-29T13:05:20Z

i knew when setting out on this road it would be a challenge i just didnt know how much of one it would be. after having many quotes some i couldnt fathom why they were so high i thought id sorted an installer. problem is they are 72miles away so first issue was doing a remote heat loss which has been back and forth several times to get it more or less correct, but still have one room thats 2m2 smaller than what i measured. anyway the next issue was getting the 28mm primaries in before the new kitchen ceiling goes in. they sent a plumber that proceeded to bugger the job up as the wall sleeve kit hadnt been supplied to him. so sent him on his way. was promised the sleeve kit the next day and i said my plumber could fit it to save them sending an engineer. next day no kit. add to this all the mods im having to do to pipe work to maximise efficiency and im seeing why the take up is tiny in the UK. im not naming the company as they are a recommended one and have apparently done good work else where but maybe thats in there local area. i know living in Boston creates its own issues being miles from any proper trades so if someone asked me would i recommend getting a heat pump in my area id have to say no. theres just not enough skilled trades where i live.

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Air Source Heat Pumps (ASHPs)

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AdamK

(@adamk)

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Joined: 9 months ago

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Topic starter 20/11/2025 9:38 am

ok now i had some cold days i think i can safely say i have an issue with either the heat pump or the install.

im getting as low as 2.4 scop for heating while getting maybe 2.8 for hot water.

this has been an issue since install. the hot water cycles always beat the heating.

i cant see any massive cycling going on ive tried dropping the wc curve and it seems to have very little effect on the scop. last setting i had which it seemed to struggle with was 0.4.

ive now let Havenwise have a go at sorting it.

all the rads are getting warm and the hot water gets upto temp. what i have noticed before letting Havenwise control it was the flow temp would rarely get above 33c yet bad scop.

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JamesPa

(@jamespa)

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Joined: 3 years ago

Posts: 3461

20/11/2025 9:48 am

Posted by: @adamk

↑

ok now i had some cold days i think i can safely say i have an issue with either the heat pump or the install.

im getting as low as 2.4 scop for heating while getting maybe 2.8 for hot water.

this has been an issue since install. the hot water cycles always beat the heating.

i cant see any massive cycling going on ive tried dropping the wc curve and it seems to have very little effect on the scop. last setting i had which it seemed to struggle with was 0.4.

ive now let Havenwise have a go at sorting it.

all the rads are getting warm and the hot water gets upto temp. what i have noticed before letting Havenwise control it was the flow temp would rarely get above 33c yet bad scop.

Are you able to post any graphs?

Unless its cycling or defrosting it should be achieving (at the heat pump) a COP close to spec. Defrost can cripple COP if it happens too frequently or goes too deep, and looking at the graph of FT might reveal whats happening. My current 24hr COP as reported by the heat pump is 3.2 (and falling, not surprisingly, it will go sub 3 I suspect), its defrosting irregularly but not more than every couple of hours

This post was modified 1 hour ago 2 times by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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AdamK

(@adamk)

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Joined: 9 months ago

Posts: 182

Topic starter 20/11/2025 10:28 am

I might try a wipe and re install of Home Assistant to see if I can get the power info to show. Was going to put it on a RPI 3B I have but it won't work as too old.

I've got an old laptop I could use. Is there a bare metal install I could use maybe? Or some decent places I can get support on it. I've asked on a couple of HA Facebook groups but silence. I can see the values in the states page in the firmware version right hand box, which seems odd, but doesn't let me add it as a history or tab.

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