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JamesPa
JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: May 19, 2026
Profile Activity
Topics: 24 / Replies: 4850
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Reply
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...

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

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

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

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

Maybe. It says 'outdoor evaporating temperature' (not refrigerant temperature) - its not clear what that means and the graph seems to define a region...

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

The dominant loud noise is the compressor or fan which you expect to be working at max during defrost. The background rattle could just be ice, ice ...

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

Curious that it reduces the flow rate at higher flow temp. I wonder what the logic is of that? If it were looking to maintain a specific DT then it ...

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

I'm not so sure this is a great surprise, there is not much it can do about DT unless it can ramp up the water pump speed, which at some point it will...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Battery with existing PV - regulations
6 months ago
Forum
Energy Storage
Replies: 14
Views: 1642
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

@crimson   Noted. At least you now have a confirmed route forward and a warm house. That, in itself, is a step forward however frustrating ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

Or just commission a plumber to do the replumbing? As soon as you touch it your installer will argue that it voids the warranty and I doubt any thir...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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