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Last seen: Dec 10, 2025
@william1066 Thanks for this. I have been looking at all the formulae. Assuming a velocity of 1.0 m/s is acceptable (0.9 m/s being the recommended val...
@heacol Thank you so much for your advice. That is really helpful. My understanding of heating systems has been gradually increasing since joining thi...
@william1066 many thanks for your detailed reply. The current flow rate for my heat pump is around 22 litres per minute (it is a non PCM pump), but I ...
@derek-m Thanks very much for this explanation. You have confirmed something that I have been wondering about - that the heat energy produced by a hea...
The antifreeze in my ASHP has a Specific Heat Capacity of 3655 J/kg/K measured at 30% dilution at 25 deg C. Compared with water at 4184 J/kg/K that’s ...
@iancalderbank. In a recent post @heacol stated that the ideal DT is 8 degrees C, so it may be worth asking him if the Panasonic heat pumps that he fi...
@brooster When you say you used just over 4kW with a COP of 3.57 I presume your total electricity consumption was around 100kWh for 24 hours, not 4kWh...
You have 2 pumps in series don't you? How do they interact when you change the setting on one pump or did you change both equally? I would have though...
@heacol Many thanks again. Sadly the UK's No 1 heat pump installer has installed the Honeywell valves you have warned me about.
@heacol Thanks for that info. That is very helpful. Do you think the defrost cycle could be a problem if the heating is off at the time of the defrost...
@heacol I have a 12kW Samsung ASHP with a 50 litre buffer tank and two fixed speed water pumps - primary pump = 19-20L/min and secondary pump = unknow...
Latest Posts
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RE: Indevolt Batteries UK Support & Info Thread
Will be interesting to see what they manage as it's bec...
By EtchedPixels , 25 minutes ago
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RE: Rate the quality of your heat pump design and installation
@trebor12345… thanks for sharing! Really valuable info ...
By Mars , 1 hour ago
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RE: The Reality Behind a Failed Heat Pump Installation – and an IWA Insurance Rejection
@batpred spot on.When a consumer agrees to an insurance...
By Mars , 2 hours ago
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My pleasure, @davidalgarve. In fact, I posted a thread ...
By Majordennisbloodnok , 3 hours ago
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@jamespa I am all for pre engineering… Would I be ...
By Batpred , 4 hours ago
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RE: Who Actually Owns a Heat Pump in Britain? We Asked. Here Is What We Found.
I am getting my house ready for a heat pump. In the las...
By Fred Gray , 4 hours ago
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RE: Cooling with air to water heat pumps
On the two huge (10m² each) south facing windows I inst...
By bobflux , 8 hours ago
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RE: GivEnergy inverter tripping due to over-voltage?
@transparent I don't think Axle have any involvement...
By Tim441 , 8 hours ago
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RE: Rural burning – I've had enough
Same here in Finland. It's strictly forbidden ...
By upnorthandpersonal , 1 day ago
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RE: Renewables & Heat Pumps in the News
Something worth flagging... we've just published a news...
By Mars , 1 day ago
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RE: Renewable Heating Hub Homeowners' Q&A Podcast
The Homeowners' Q&A podcast is back... I've changed...
By Mars , 1 day ago
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RE: Anyone concerned about GivEnergy?
I have already signed up with Axle so yes, that takes c...
By KevH , 1 day ago
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@batpred Would it pass the airbnb feedback test no. I...
By EtchedPixels , 2 days ago
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A quick update... we've just launched the beta version ...
By Mars , 2 days ago
