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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Sep 18, 2026
Profile Activity
Topics: 27 / Replies: 5395
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread

A lmost certainly yes to the first half but in a way could be caused by oversizing. Oversizing means bigger rads. Bigger rads means more output at a...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Thats an assumption you are making and it may well turn out to be true, but the evidence is entirely consistent with that: In the first plot you sha...

10 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Cosy home (?)

Its nothing to do with the heat pump of course, something about the house. It could just be that its very low heat capacity (which can happen if all ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread

Now that really is nuts. Hopefully tech support dont suggest to downsize the radiators!

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Yes but it reaches a higher temperature than the previous defrost cycles, for which there must be an explanation. This might give a clue to why the r...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Thanks for the extra info. A couple of questions and some comments   TWI being the buffer? or something else? If its the buffer 4C is a bi...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

@trebor12345 Good data, will examine more closely before commenting. Do you have IAT for same period?   Can you clarify what controls the ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Cosy home (?)

  0.5 C per hour is quite fast. 14kW is enormous, how big (floor area) and what construction is your house Increasing emitter size is alm...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost behaviours

I suspect, but have no evidence, that defrost is very variable according to location and time. There are places in the UK that are very humid and pla...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost behaviours

Thats a lot of defrosts although in fairness my Vaillant gets up to one per hour at times I don't know what you can do, if there are plants or anyth...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

I think your concerns about abnormal refrigerant temperatures have been answered in this post. Once we have some data we can look at whether the fre...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Owners

@sim0n0 Sorry to hear that. Putting the past aside would you like to describe the current problems and tell us a bit about your system and house in...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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