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Last seen: Aug 1, 2026
You are correct no BUS. Are you saying that the MCS certification is only an issue if there was a BUS?
JamesPa So the risk of MCS picking this up is small, which is good to hear. The prime contractor has a good track record, so I am I little surprised...
I moved to a new build 18 months ago with a 2 year warranty period. The builder has completely ignored any requests for remedial action. Oversize...
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...
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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 , 20 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 , 21 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 , 1 day 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 , 1 day 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 , 1 day ago
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RE: Cooling with air to water heat pumps
Passive cooling should always be the first call. Keep ...
By JamesPa , 1 day 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 , 2 days ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 2 days 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 , 3 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 , 4 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 , 5 days ago
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