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Last seen: Sep 20, 2026
Where does the heat during the 5 min period go, to the evaporator to de-ice or to the heating system (which makes no sense). Is the water pump runnin...
It might actually account for more defrosts because the compressor is working harder. On the positive side it should cycle less at mild temperatures!...
Interesting. What does the water pump do during this. I understand the compressor stopping, its will need to do that to switch from heating to coo...
I have not yet seen a set of performance curves for a heat pump with more than a factor of 3 between max output (at say OAT - 2C) and min output (at s...
Its actually very cold at night just at present, mine is runnoing at upper 30s flow temperature and going into defrost mode overnight! Looks like...
Sorry to hear this is not yet fixed but please do keep posting as those here can help. At present its actually very cold at night despite the warm da...
Sorry to hear this, it shouldn't happen! Did the installers bump up the WC curve again and/or reinstate control by thermostat, undoing all your good...
Which, if you are right (which you may be), is unfortunate to say the least, because climate change and the catastrophic effects it is certain to have...
PHE s can fail, I'm not sure what the most common failure mode is. If a plate separating the two circuits failed pressures will presumably equalise, ...
Hitachi is sadly not alone. The OAT sensor should be in the shade and out of any influence from the heat pump itself. only some manufacturers do thi...
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Latest Posts
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RE: Next steps on my ASHP journey: Radiators and Pipework
@jamespa since going back to bed and reading again this...
By Singlespeed , 1 hour ago
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RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
If they can't don't give up. Heat pumps are, in reali...
By JamesPa , 17 hours ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
@ian-s I wouldn't be too concerned about the design ...
By Rob of York , 17 hours ago
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RE: Missing flow temperature in Heat Geek proposal
Yes that's what would happen by turning down the lsv to...
By JamesPa , 18 hours ago
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RE: Grant R290 DHW Cycle Interuption
It looks like some sort of short pre-run. The question...
By JamesPa , 20 hours ago
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RE: Cascade System or larger single unit
@renewables345 I would say if it a new build it’s no mo...
By Aventus Eco , 20 hours ago
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RE: Why are ASHP installs so expensive?
Posted by: @batpred There´s another aspect that coul...
By Rob of York , 1 day ago
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RE: Say hello and introduce yourself
@gz00, welcome to the forums. There’s a huge amount of ...
By Mars , 2 days ago
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RE: Home energy storage & battery register
1 fox ess lv5200 batteries, plus 2 more waiting to be i...
By Jimcub , 2 days ago
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RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
By JamesPa , 2 days ago
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My feed of random industrial auctions turned up this au...
By Prunus , 2 days ago
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Thank you @majordennisbloodnok – that means a lot, part...
By Mars , 3 days ago
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We’ve just passed 20 million forum views! 🎉
It's official. The Renewable Heating Hub forums have of...
By Mars , 3 days ago
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RE: Who's your electricity provider and what's your tariff?
@batpred When the raw material input has increased in c...
By Papahuhu , 4 days ago
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