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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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Batpred

(@batpred)

Prominent Member Member

Joined: 12 months ago

Posts: 359

05/12/2025 12:16 am

Posted by: @adamk

↑

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.

If you are looking for help getting started on HA, there are some good recent posts on the Solis inverter thread. @majordennisbloodnok also posted elsewhere in this forum with a series with an explanation of HA. The HA installation page has step by step instructions on how to get HA on an old ex-windows box..

I am wondering when anyone here will have a play with the local integration that can be made to the Vaillant eBUS (as they do not seem to support modbus). Maybe there´s a programmable thermostat type of implementation... A couple of threads on eBUS:

https://community.home-assistant.io/t/vaillant-heating-control-integration/807296

https://community.home-assistant.io/t/making-vaillant-boiler-smart/669613

16kWh Seplos Fogstar battery; 8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC

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SimonF

(@simonf)

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Joined: 3 weeks ago

Posts: 1

05/12/2025 2:07 am

@adamk

You can get an idea of if your flow and return sensors are accurate by measuring the difference between flow and return temps around 10 minutes after a compressor run has finished but with the pump still active. If the sensors are accurate the two values will be the same or with only a very small difference i.e. 0.1c. In my case, I have a difference of +0.7c on the flow rate which results in over reporting of cop in the Vaillant app. Maybe you have an underreporting flow rate sensor. You can check the live values using the VWZ AI controller.

I use home assistant via ebus to calculate a corrected flow value for a more accurate heat output and cop.

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AdamK

(@adamk)

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Joined: 10 months ago

Posts: 196

Topic starter 13/12/2025 12:08 pm

@simonf thats interesting as I’ve noticed my flow and return cross when it’s on cooldown not by much though 0.5c.

This post was modified 2 weeks ago by AdamK

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AdamK

(@adamk)

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Joined: 10 months ago

Posts: 196

Topic starter 28/12/2025 5:53 pm

Still got the noise. Noticed it’s quite loud in my son’s room but he says it doesn’t bother him. I think it’s louder when the weather gets cold, which makes sense as the compressor is running harder.

also been outside today and noticed the soak away under the heat pump is overflowing, not massively but enough to soak the concrete under the unit. When it was put in I wasn’t convinced the hole dug would be enough.

This post was modified 2 hours ago by AdamK

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JamesPa

(@jamespa)

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Joined: 3 years ago

Posts: 3764

28/12/2025 6:02 pm

@adamk FWIW I managed unintentionally to 'coax' mine into making more noise than usual . The noise sounds rather like what you are experiencing and also appears to be louder inside the house than out (!).

In the summer I fitted wooden side slats and a heavy ceramic slab on top to make the heat pump a 'feature'. Now its cold, the slab is somehow causing more noise. I have fixed the problem by (a) removing the slab to prove the noise is caused by the slab and (b) replacing it but this time ensuring its well clear of the pump casing (5mm separation all over).

Im not sure whether the effect was due to weight, or the slab constraining the dissipation of the sound, or what, however it was definitely due to the slab and I have now fixed it! Perhaps the slab was heavy enough to stop the case moving on the vibration absorbing feet and thus cause something inside to vibrate relative to the case more than would otherwise have been the case, a possible cause which could have relevance to your situation.

This post was modified 2 hours 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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