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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 24, 2025
Topics: 18 / Replies: 3506
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RE: Replacing my 18 month old ASHP

Mine does make some strange noises during defrost but nothing I would describe as a rattle. I have no idea if Hitachi tech support are helpful or no...

5 hours ago
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RE: 10kw heat pump run in 24*7 data?

Yup that will do! I cant see a problem with that in principle but this is something worth checking in the app. According to the app (I havent ve...

5 hours ago
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RE: 10kw heat pump run in 24*7 data?

No. Absolutely do think of it as the temperature you want the room.   In more detail: The heat curve slope is set by the parameter: 'Heat ...

6 hours ago
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread

Heat pumps should always be run with most (preferably all) of the system open. Shutting down 10-20% is unlikely to be a problem, shutting down more i...

6 hours ago
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RE: Replacing my 18 month old ASHP

Thats expected I wouldn't expect it to rattle. can you tell what is rattling?. I would expect it to be iced up Honestly no idea what cycle ...

6 hours ago
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RE: 10kw heat pump run in 24*7 data?

Unless your house cools a lot during the setback, its still losing heat at almost the same rate - houses dont stop losing heat because you turn the he...

7 hours ago
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RE: Getting the best out of a heat pump - is Homely a possible answer?

Absolutely. Dont use it! Seriously Nest, like other smart thermostats (other than Homeley, Havenwise, Adia), are wholly unsuitable for heat pump co...

9 hours ago
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RE: 10kw heat pump run in 24*7 data?

Hi Thanks for the extra info, it helps with the picture Just to confirm what is the make up of the downstairs flooring/insulation (you speak of su...

10 hours ago
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RE: Replacing my 18 month old ASHP

@trebor12345 As you can see the community is discussing ideas on how you might best control this system. I have been reading the user manual. You h...

13 hours ago
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RE: 10kw heat pump run in 24*7 data?

I didn't know about that history. With the modern trend towards retrofitting UFH this means that we can expect a whole slew of failed heating install...

13 hours ago
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RE: Replacing my 18 month old ASHP

@bontwoody Given your experience from your previous house and given op has a 8kW heat pump for possibly a 2.5- 3.5kW house which takes 18hrs to co...

1 day ago
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RE: Replacing my 18 month old ASHP

Thats really helpful. The plot produced is odd and to me smacks of flow temp reduction triggered by a control not by defrost. The temperature soon r...

1 day ago
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