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trebor12345
trebor12345
@trebor12345
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Joined: Feb 26, 2024
Last seen: Feb 7, 2026
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Topics: 10 / Replies: 115
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RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey

You are correct no BUS. Are you saying that the MCS certification is only an issue if there was a BUS?  

1 day ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey

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...

1 day ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Gaslighting in the heat pump industry – has anyone else experienced this?

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...

2 days ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
MCS - BS EN 12831-1:2017 – Heat Loss Survey
2 days ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 6
Views: 49
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

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 ...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

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...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

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...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

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...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

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...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

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.

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
SAP Report
2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 0
Views: 62
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

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...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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