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JamesPa
JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Oct 8, 2026
Profile Activity
Topics: 27 / Replies: 5468
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Reply
RE: Octopus Cosy Heat Pump Owners & Discussion Thread

Wow, that sounds like fun. There is another thread where someone with a Hitachi heat pump (featuring a more conventional vertical fan) describes a si...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

@davidb Further to my previous post one further comment I would make is that 300l system volume is not consistent with 7 radiators. Unless you have a...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey

Since May 2025 it no longer a requirement in England to benefit from permitted development rights (ie planning consent without having to make a planni...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

@davidb Once again I agree with Adrian. Houses have memory and different bits cool at different rates. So for example (this is just one mechanism...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

I agree with the comments made by @adrian both about the fire and the DHW. You should also bear in mind that, with a low loss house, COP isnt so impo...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey

I think its small, but off course it could happen so please dont rely on it. They do a sample check of some kind on installers and my system was chec...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hoped for improvements not being realised on my Mitsubishi heat pump

I have been wondering that myself. The fact is that, even with the buffer (meaning that the secondary pump doesn't have to push water through the pi...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey

The change in calculation methodology (which mandated BS EN 12831-1:2017 as opposed to the simpler calculation) were first published early in 2025 an...

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

That statement in itself (which I am not in anyway criticising) exposes the limitations (I originally wrote madness, but relented because they doubtle...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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