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Last seen: Aug 25, 2026
@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,...
That is an argument which has been made before, and will be made again by those who seek to frustrate efforts to mitigate the impact of climate change...
I wouldn't expect price equality, but currently 'green' taxes all fall on electricity whereas electricity, if used to drive a heat pump, is by far the...
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Degrees of Separation
Latest Posts
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RE: How Accurate Is My DIY Heat Loss Calculation?
@editor Thanks Mars, I have been enjoying playing with ...
By kilgorexv , 2 hours ago
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New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
I am feeling baffled and worried:We are having a an Aro...
By GutoFfowc , 5 hours ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
@rob-of-york Thank you, I’m thinking along these same l...
By Toodles , 7 hours ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 7 hours ago
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RE: Questions about A2A for heating as well as cooling
@donciccio I would suggest that you take a "fabric-fi...
By Rob of York , 8 hours ago
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 1 day ago
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RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 2 days ago
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RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 2 days ago
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RE: Who's your electricity provider and what's your tariff?
@chandykris Swings and Roundabouts, you win some…. ...
By Toodles , 2 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 3 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 3 days ago
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RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
By JamesPa , 3 days ago
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RE: The good, the bad and the not that great – my heat pump installation
@burtis, I’ve followed this thread pretty much from the...
By Mars , 6 days ago
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