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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Dec 6, 2025
Topics: 19 / Replies: 3623
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RE: Struggling to Find a Top Heat Pump Installer? We Can Connect You With the Best Installers in the UK

There seems to be plenty of evidence to support this. My measured loss is consistent with ach of 0.5-1 whereas the mcs calcs default to 2-3. ashp sy...

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

yes to both, probably. External controls for ashps (and many modern boilers) are largely superfluous and frequently counterproductive. The possible...

3 hours ago
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RE: One Year Review: Grant 13kW ASHP - A Catalogue of Errors

@solenoid it sounds like you are making progress. No need to hurry these things and please feel free to ask any questions.

3 hours ago
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RE: How good is the app support for your heat pump?

I think you are right about the ebus stick. It's certainly possible to change at least some of the exposed vaillant parameters through the ha integr...

16 hours ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Yes, you can work out a lot from a plot of FT. Interesting that there were both deep and shallow defrosts, for reasons I dont understand.  

1 day ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

OK thats a pity it would have been good to see if/how defrost changed as a result of switching off night shift and overnight there would have been ple...

1 day ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

My Vaillant was defrosting every 45-60mins overnight (chart shows FT). As you can see it doesnt fully recover from the defrosts because noise reducti...

1 day ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Something odd about this diagram; the refrigerant is moving in the wrong direction for defrost - warm refrigerant from the compressor should be headin...

1 day ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Thats a bit suspicious. Some (older?) heat pumps apparently defrost on a timed cycle rather than on demand. I wonder if these are in that category (...

1 day ago
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