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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...
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RE: HeatPump maintenance in Swindon area?
@vince31 have you tried using our finder:/p>
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