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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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Degrees of Separation
Latest Posts
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 8 hours ago
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@kilgorexv, I actually think doing your own calculation...
By Mars , 8 hours 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 , 22 hours 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 , 1 day 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 , 1 day ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 2 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 2 days ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
There is scope for product development here. I for one...
By JamesPa , 2 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 , 5 days ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
First time poster here but I can share my experience as...
By SCH , 6 days ago
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RE: Is it the house or the equipment?
...which, I've found out, is pretty much impossible to ...
By Majordennisbloodnok , 6 days ago
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