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Last seen: May 24, 2026
OK, I calculate a flow of about 1.9m3/hr in the secondary circuit. This is the Grundfos web page for the pump data: You said CC3, that gives a ...
Hello. OK, I've plotted your PEX data in the attached spreadsheet. The data shows your PEX is pinched between Prim_in and Sec_Out. That means the ...
Hello, A quick reply, I need to go out but will be back later. You said the plate exchanger was installed non-countercurrent. Please can you post a...
@cathoderay thanks for sharing that data. There's not much numerical analysis I can do with it because I need to know 1 flow. Please let me talk (t...
Ahhhh.... When your system is operating at it's equilibrium point the energy from the heat pump is released into the room by the radiators, but ther...
Right, this carries on from this post (Hopefully I got that right). How can I sanity check the amount of ice accumulating in an 8kW ASHP? I th...
@cathoderay, darn it. I missed your comment about room temperature. I've also worked out your primary system volume, 20L. That's small. You have ...
@transparent Thank you for that suggestion. I had seen that type of unit. They fall under the F-Gas regulations in the UK, because there's a refrige...
@cathoderay thank you for the data. It includes information on the fan speed, that's helpful! The data show's your room temperature is 25C and never...
@cathoderay thank you for sharing the most resent set of data, I'll work through that. Are you able to create a table of numerical data, or can you o...
Evening all, An air to air heat pump system might be a possible solution, but I'm not F-Gas registered so couldn't install one. I'd like to keep co...
@transparent Hello. This will not be covered on any grant scheme, I'll be paying the full cost from own pocket 😉 The garage / workshop is a stand a...
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Degrees of Separation
Latest Posts
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RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 6 hours ago
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RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
Sooooo, what did we do in the end? We approached three ...
By Penval , 7 hours ago
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RE: How Accurate Is My DIY Heat Loss Calculation?
D'oh - of course. I shouldn't post before my brain is f...
By Old_Scientist , 12 hours ago
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RE: Questions about A2A for heating as well as cooling
@rob-of-york I would concur with the underfloor insulat...
By Toodles , 14 hours ago
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RE: New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
Nothing attached! I have rads but UFH makes the case ...
By JamesPa , 14 hours ago
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RE: Cooling with air to water heat pumps
Passive cooling should always be the first call. Keep ...
By JamesPa , 15 hours ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
@rob-of-york Thank you, I’m thinking along these same l...
By Toodles , 1 day ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 1 day ago
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 2 days 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 , 3 days 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 , 3 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 4 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 4 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 , 4 days ago
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