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JohnR
@johnr
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Estimable Member
Joined: Nov 25, 2024
Last seen: Apr 8, 2025
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Topics: 0 / Replies: 106
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RE: My house is too big and the Vaillant 7kW heat pump can't heat it when temperatures drop below 4C

I've just checked the heat loss calculation for my system (7kW Arotherm+) and it estimated 8.3kW at -2.8C. I reckoned that was high compared with the ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: What happens during the transition from winter to summer with your heat pump?

You should also be able to set an outside air temperature at which the system will turn off.

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: What is the maximum output of the Vaillant 7kW Arotherm Plus

According the the Vaillant app, my 7kW Arotherm+ produced 7.6kW when the outside temperature was -7C.

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pump's integral circulator pump

My 7kW Arotherm+ normally runs at 1200 litres/hour but I've seen it show 1800 litres/hour when doing the DHW. It may also use the latter speed when ge...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

Some points arising from comments above: 1. The heat pump can't defrost and produce heat at the same time. It's the process of extracting heat from ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Suitability of 45C flow temp with existing pipework

That looks good. I note the best practice of first fitting the pipe insulation and then clamping the insulated pipe to the wall - something that my in...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Solar Performance

Winter is a bad time for solar generation. This past winter has been gloomier than normal and if your panels aren't facing south or are vulnerable to ...

7 months ago
Forum
Solar Photovoltaic (PV)
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RE: buffer/volumizer cupboard space eater, do i need one?

I've also got some potentially relevant data because I bought a pair of Elitech recording temperature sensors and fixed them to the flow and return pi...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

Definitely not A or G which are in the DHW circuit as that creates a lot more water to heat up to DHW temperature when heating the DHW. My buffer tank...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

50 litres/p> But a flow temperature of less than 35C must be a major contributor to the good COP.

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Boston Lincs based homeowner seeks advice on HP install

I think you should be aiming for lower (<40C) flow temperatures and an SCOP nearer 5. You might need some bigger radiators than currently proposed ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

I'll rock the boat as I've got a buffer tank as part of an installation of similar size to what is proposed and reckon that it's one factor in getting...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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