Last seen: Oct 11, 2025
@scalextrix I think what you are describing is exactly why I am so sceptical of room by room assessments and more supportive of previous use estimates...
@guydeb I'm just in the middle of constructing a 40m2 extention myself and looking at the amount of insulation required now I expect the heat loss to ...
@guydeb Yes. No problem running just UFH from an ashp. The issue I think would be the very low heat loss in a 40m2 new extension. How sure are you tha...
@matwin I believe the degree days calculation is an accurate method of assessing heat pump size. Im not sure how much detail the YouTube video goes i...
@scalextrix As @JohnMo says though at lower temperatures they need to be bigger so that will probably be the worse performing one in the CH. Also they...
@scalextrix I cant help with the CH side but you might look at the plate heat exchanger used with a mixergy cylinder to get a handle on the DHW. By al...
@chandykris Thats a fair point and something Ive considered. I do keep one eye on ebay for any reduced price battery packs 🙂 Can you post the figu...
@chandykris We seem to have similarly sized systems and yes I found Go to be a better choice than cosy with a couple of minor months difference. I r...
@editor not via the WC curve but as @old_scientist mentioned the setting is in the FSV menu so I was able to set that to 19C rather than it’s default ...
@editor Thanks Mars. Interesting talk. I will just point out however I don’t actually run my heat pump at 40C when it’s 17C outside! Don’t know why I ...
@cbrenewable Your COP does appear very low and if you don’t have a buffer that rules out one possible cause. The only thing that stands out as unusual...
@judith that’s interesting as my calculations suggested a smaller battery that didn’t last the day was more cost effective for me. I couldn’t even mak...
Latest Posts
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@agentgeorge Back to the Future with the flux capacitor...
By GrahamF , 3 hours ago
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RE: Heat loss calculations and how they work in conjunction with heat pump sizing
@jamespa unfortunately, I don't think heat loss calcula...
By GrahamF , 3 hours ago
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RE: Renewables & Heat Pumps in the News
I am not sure if many people would be running aircon or...
By Batpred , 5 hours ago
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RE: What crazy nonsense are inverter limits and why are they imposed?
That will be producing significant losses due to phase ...
By Transparent , 5 hours ago
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RE: Isolating the system for a planned power cut
When I said we'd need to know more about the RCD, MCB a...
By Transparent , 5 hours ago
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RE: Radiator sizing for heat pump installation by British Gas - are these correct?
With the frvs, I assume looking at the blurb, they just...
By Bash , 7 hours ago
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Which tells us something (including possibly everything...
By cathodeRay , 7 hours ago
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RE: Flexi-Orb Heat Pump Scheme Update: Progress, Pilots and Why This Matters for Homeowners
Thanks for sharing. Sounds promising, ISO are indepe...
By Batpred , 11 hours ago
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RE: Specifying batteries, pv solar etc using ChatGPT
I have been positively surprised when I asked it to spe...
By Batpred , 12 hours ago
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Thank you. That simultaneously answers my question abou...
By Transparent , 16 hours ago
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RE: Heating Turned Off but Radiators Still Warm
What do you mean by 'turned off' exactly. Same questio...
By JamesPa , 16 hours ago
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RE: Low Flow Rate Error - 8 kW Ideal Logic ASHP - Help!
@wh0am3ye - OK, starting to make sense, but it does mea...
By cathodeRay , 17 hours ago
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@editor fortunately we have a boiling water tap in the ...
By bontwoody , 1 day ago
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RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face
@Fiona, I really don’t want to disappoint you, but I ha...
By Mars , 1 day ago
