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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jan 14, 2026
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Topics: 20 / Replies: 3931
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RE: Help me keep the faith with my air source heat pump installation

OK. I have 2.8 for DHW and 3.4 for space heating running at an actual FT of about 36. Yours does seem a bit low depending on what FT you were runnin...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 10kw heat pump run in 24*7 data?

Don't forget to increase max ft also. Mine is set to 55, way clear of the curve. I think that might even have been the default.

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 10kw heat pump run in 24*7 data?

Suggest, as a test, you turn up the WC curve a lot so any change or not is unambiguous. I'd also set max ft to say 55 to get this parameter out of th...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 10kw heat pump run in 24*7 data?

Emptying the NR schedule will turn off NR mode yes. Im not sure you have a reason to do so yet though.   With such a small reduction in O...

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

Not surprised by that. FWIW my Vaillant has done more or less exactly the same. Its COLD out there! With those figures I get an overall SCOP of 4, ...

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

Fair enough (the raging). Try not to let it upset you (easier said than done I know). Unlike some less fortunate people you remain in control it seem...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: British Gas vs Octopus Energy vs Heat Geek vs EDF vs Aira

I think that's what they do, so they are varying ft. It would be good to see some plots at various oat values  

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

No cycling there except possibly at midnight on the first day. You would expect so but don't forget cop varies with oat also. Also depends on how l...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

Possibly. I haven't yet worked out what Vaillant do with water pump speed as I can't monitor it and don't have a reason to care. Why is it a 'proble...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: British Gas vs Octopus Energy vs Heat Geek vs EDF vs Aira

So is the flow temp changing as well or is that fixed?

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

Yes but (a) you are talking Facebook and (b) it was the coldest day of the year so far so hardly surprising (+ all the things you say above)  

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: British Gas vs Octopus Energy vs Heat Geek vs EDF vs Aira

My strong suspicion is that if a heat pump would otherwise cycle, particularly if it would otherwise cycle with short on time, then setting it to idle...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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