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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: May 19, 2026
Profile Activity
Topics: 24 / Replies: 4850
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Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

No need to change anything, just to capture current values. Without this information we literally don't know what we are dealing with!  

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

Yes, sorry.  

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

Thanks. Are you saying night shift is 'on'. If so what are the parameters for it?

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

should have read "but the evidence isn't entirely consistent with that:"  

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

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

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

6 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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

6 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 ...

6 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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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