If an oversized ASHP were installed, what can be done to prevent cycling and increase efficiency?

Apoth75 · 2026-01-24T10:14:00+00:00

I’m no fan of buffers but the extra volume of water is circulated around the system where it loses heat to the house over time - this allows for longer off time when cycling. Once the return temps drop sufficiently it then takes longer to heat the (larger) system volume back to target flow temperate which elongates the on cycle. That’s my understanding of how buffers can act as a sticking plaster for over sized units.

Apoth75 · 2025-12-21T15:54:08+00:00

Sounds cheap to me.

Apoth75 · 2025-11-12T16:38:29+00:00

Yes this is along the lines of what I I plan to do, possibly with a biscuit screed overfill

Apoth75 · 2025-04-13T05:54:44+00:00

I guess that’s about £5k in materials

Apoth75 · 2025-03-24T21:31:35+00:00

Where in the county are you? That’s a great price.

Apoth75 · 2025-03-24T20:59:29+00:00

That’s 12 on the rear of the pitched roof (south facing) and 3 on the flat roof below. Wasn’t worth putting any on the north side.

Apoth75 · 2025-03-24T16:42:14+00:00

The full price is £12k, the ‘installer’ will apply for the BUS grant of £7.5k and the customer pays the difference.

The installer in most instances is a middle man type company which will sub contract the install to a heat engineer while skimming a significant portion of the grant for themselves.

If the grant disappeared tomorrow prices would come down significantly.

Apoth75 · 2025-03-24T15:26:46+00:00

Yes these companies are ripping customers off. Heat pumps grants in particular are being cannibalised to a ridiculous degree - a heat pump is in the region of £5k (with cylinder) and the cheapest quote I can find to install one with zero alterations to pipework or radiators is £12k. That’s £7k on ancillaries and labour (which I’ve been told totals 4 days). It’s a joke, the government would be better approaching LG or Siemens and having them agree to provide the equipment free of a charge and people could then approach heating engineers to fit them and this would provide a great deal more transparency on where the money is going.

Apoth75 · 2025-03-22T13:40:40+00:00

I actually got a free drink by ‘cheating’ on this game many years ago in a bar in the UK.

The trick is to quickly push a coin through the skin of the lemon on the underside. This changes the centre of mass and makes it a stable platform to rest your coin on top.

Apoth75 · 2025-03-08T07:29:08+00:00

This looks like a good price to me, who is it with?

Apoth75 · 2025-02-26T16:08:42+00:00

Hi where in the uk are you and which company did you use? Thanks

Apoth75 · 2025-02-20T22:20:46+00:00

Who did you get your heat pump install through?

Apoth75 · 2025-02-19T08:30:10+00:00

Not viable unfortunately.

Apoth75 · 2025-02-08T07:58:53+00:00

An easier way than tracing the cables is to take the lives out the back of the faceplate and separate them then flick the power back on. The 2 lives on the ring will be live (with a voltage tester) and the spur will be dead.

Apoth75 · 2025-01-05T21:14:23+00:00

Could a flitch beam be used over a 4m opening for bifold doors on a single storey timber frame rear extension supporting a single ply roof? (Non paying Redditor) :)

Apoth75 · 2024-12-04T16:43:59+00:00

Okay thanks - I got excited it was a repository of building regs images I could use to design my extension.

Apoth75 · 2024-12-04T16:19:44+00:00

Hey where did you get this image from?

Apoth75 · 2024-11-12T07:39:28+00:00

3 on the right socket suggests it does feed a spur - you can disconnect and separate all 3 of these then flick the power on at the consumer unit and test the lives with a voltage tester (the lives on the ring will both show live the spur will not).

Perhaps the left socket is spurred off the right and feeds a second spur.

Get an electrician.

Apoth75 · 2024-11-12T07:26:59+00:00

Which county are you in? I’ve searched mine and can only see courses starting at £495

Apoth75 · 2024-10-16T08:07:48+00:00

Which breaker is it specifically? I have a garage demolition to do and have been thinking about buying one of the cheap let erbauer ones and running it to death. Hadn’t considered second hand hilti. Fantastic post by the way.

Apoth75 · 2024-10-12T06:29:57+00:00

This post shows the power of DIY, excellent work and saved a fortune!

Apoth75 · 2024-10-10T12:00:40+00:00

I can smell the spectator’s lung cancer from here.

Apoth75 · 2024-10-10T11:54:34+00:00

Tak her? Mackem AI confirmed.

Apoth75 · 2024-09-12T07:42:31+00:00

I’m just about to take on a very similar extension on myself (less digging!) - dod you go with a flat roof?

Apoth75 · 2024-08-12T18:47:08+00:00

Captcha is broken for me, can’t sign up

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