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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 20, 2025
Profile Activity
Topics: 16 / Replies: 2631
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RE: Adjusting 6kW Daikin's Weather Compensation Curve

If you get outdoor temperatures outside the range where the curve has a slope then yes. So if your oat goes below -2 with any frequency I would adjus...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

I think you are covering two points, namely water pump modulation and control strategy (weather compensation and/or room thermostats. I will deal wit...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?

Firstly thank you for the feedback, its always good to get. The only way I can see you could balance the temperatures would be to throttle the UFH. ...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Setback savings - fact or fiction?

In fairness I would expect the COP to change, because you are working the heat pump harder in setback (which is the whole basis of the argument that s...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is it KISS or constant – weather compensation vs. set flow temperature?

@cliffhanger suggest you reread my post above, I edited it after you looked at it. I found a video which helps a bit, but Grant do seem to have come ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is it KISS or constant – weather compensation vs. set flow temperature?

@cliffhanger I have a pump with the 'factor' curves and, once you understand them they are easy to operate, easier in fact than the '4 point' system...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

As others have implied, the latter (this is the most important thing to understand about heat pumps). In short the procedure is: Set all your...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Definitely - I didnt realise that they had a stake in the house in warehouse. Octopus also have access to 'big data' from their installed heat pumps...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

With his permission I did some analysis on the plots of 'similar days' posted by @cathoderay a few posts ago. The most important thing that comes o...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is it KISS or constant – weather compensation vs. set flow temperature?

The heating curve specifies a higher LWT at low OATs, and a lower LWT at higher OATs. Thats the whole point of the heating curve - it varies the LWT ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?

It is indeed a good question. The purpose is always said to be to ensure that there is sufficient water in the system to yield sufficient energy to...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Should I make my radiators smaller?

Mine are also upstairs because I upgraded them before I realised how much the heat pump industry overestimates house losses. Still not a problem alth...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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