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Last seen: Sep 18, 2026
My Air Permeability is : 2.35 m³/(h·m²) @ 50 Pa. So if I use your magic factor: 2.35/20=0.1175. According to my SAP report the overall Infiltration ...
I have been looking at ACH and the requirements of BS EN 12831-1:2017. Whilst information is sketchy because I don't have full access to the standard...
The first year we were at the property we didn't run the MVHR with no problems. Currently the property is at 21/22C (24/7) and only 33% RH with the M...
MatWin I am also a B. Below is a summary of our heat loss. Staggered by the ventilation loss. I would estimate only 500 watts or 0.1 ACH. Base on t...
I didn't word the above question very well. I am trying to see what the 0.5 ACH old standard would mean to a 2024 built building with a Air permeabil...
Has anyone had a heat loss calculation to the 2025 standard? The firm I am using for my new HP is still using a building figure of 0.5ACH.
A big thank you to @jamespa for all his efforts online and via private message, he really does go all out to help. Hitachi visited today to address t...
Mars Excellent article. Love the term Post-Traumatic Heat Pump Stress Disorder (PTHPSD). I also monitor my HP "Like a Patient on Life Support".
@jamespa My mistake this was not the flow temperature chart, but my refrigerant temperature, it shows better what the heat pump was doing. Below i...
Yesterdays run 8th Dec. Chart is showing flow temperature. The HP didn't like a set temperature of 29C. Very little on periods. Lots of temperatur...
I have been experimenting with different flow temperatures to help facilitate the setting up of WC. Todays run was the lowest temperature I have used...
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Degrees of Separation
Latest Posts
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@mrkfm Once I had decided to purchase a heatpump it bec...
By mkz , 9 minutes ago
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RE: Cooling with air to water heat pumps
@editor does that mean you have to have two separate ex...
By mrkfm , 10 hours ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
Posted by: @ian-s Could always use the money saved o...
By Rob of York , 15 hours ago
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RE: Why are ASHP installs so expensive?
And then you look at US electricity prices and weep.
By bornagain , 17 hours ago
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Depends on what controls the pump! Thats the whole poi...
By JamesPa , 22 hours ago
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The positive reviews keep coming in for Britain's Heat ...
By Mars , 1 day ago
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RE: Next steps on my ASHP journey: Radiators and Pipework
I have one of these fitted which also allows you to reg...
By Old_Scientist , 2 days 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 , 3 days 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 , 3 days ago
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RE: Grant R290 DHW Cycle Interuption
It looks like some sort of short pre-run. The question...
By JamesPa , 3 days 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 , 3 days ago
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RE: Say hello and introduce yourself
@gz00, welcome to the forums. There’s a huge amount of ...
By Mars , 3 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 , 4 days ago
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RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
By JamesPa , 4 days ago
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