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Last seen: Oct 28, 2026
True Thermodynamically maybe not true. Short cycling will result in a reduced requirement for higher flow temp than long cycling so thermodynam...
According to the basic physics, no they won't. Obviously there might be 'engineering' effects, but the basic physics says that running continuousl...
@derek-m Thanks for the analogy but I'm not sure how it changes the fundamentals. If the HP is forced to cycle because it can't maintain a steady sta...
@iancalderbank This is an interesting facet of heat pumps not much discussed. It's going to vary by person and property and probably also time of yea...
Its not so much frequency that causes the loss in efficiency, its the fact that, to deliver the same energy from the emitters, the heat pump must oper...
Agreed. Without doing all the sums my guess is that the critical temperatures are 4-8 (perhaps 12)C where the energy demand is high and is a temperat...
@filipe Im not sure that there was much 'good' cycling, just some where the difference was negligible. The key messages for me were 1. Cycling mea...
Definitely. In the UK 1.4M gas boilers are retrofitted each year, the task is to make that 1.4M heat pumps. That's a major task which will not be a...
The responsible manufacturers include defrost time in their system specs and give you the net output. However as you say 11kW sounds about right allo...
The sad thing is that its still happening with heat pumps. I have had in total 10 quotes and 2 full (3 hour) surveys. The two full surveys both esti...
Range and charge speed are both increasing and taking a break after 3 or 4 hours driving is good for safety. The number of charge points is also incr...
Indeed. The transition to EVs is going, in a decade or so, to be an interesting case study. Having test driven several, they are simply better cars,...
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Latest Posts
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RE: Free app: run the immersion / heat pump from Growatt battery & solar surplus – no Home Assistant
Please bear in mind, everyone, that in order to use thi...
By Majordennisbloodnok , 30 minutes ago
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RE: The good, the bad and the not that great – my heat pump installation
@burtis Thanks for posting this and Im so pleased you ...
By JamesPa , 2 hours ago
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RE: I need help with Ecodan ASHP
@f1p It turns out there have been a solar panel install...
By Andris , 14 hours ago
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews your installer would be right to say that the...
By GrahamF , 14 hours ago
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RE: Vaillant ecoTEC Plus - Flow Temp and Set Up
@trebor12345 That curve looks healthy to me. I woul...
By JamesPa , 16 hours ago
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RE: Tradespeople on Their Phones: What’s Acceptable When They’re Working in Your Home?
Actually, that's a very important point. I've only ev...
By Majordennisbloodnok , 23 hours ago
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
@susannasaunders can I just add to @rob-of-york s comm...
By JamesPa , 1 day ago
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RE: Aerotherm and weather compensation
These are likely inked. The basic explanation is tha...
By JamesPa , 1 day ago
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RE: Electrical works for air to air heat pump
agree with above. I have not had extra costs added wh...
By Batpred , 1 day ago
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Good to hear that you found a solution. Absolutely a...
By Batpred , 1 day ago
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RE: Are there any comparisons of DHW heat stores around?
@sarahemmm I have done things the opposite way round I ...
By Toodles , 2 days ago
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RE: How will removing the standing charge on gas bills benefit heat pumps?
The BUS grant funding for 2026/27 will run out at the c...
By Rob of York , 3 days ago
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RE: Say hello and introduce yourself
@e-a-west as the good Major said, welcome to the forums...
By Mars , 5 days ago
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