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trebor12345
trebor12345
@trebor12345
Member
Reputable Member
Joined: Feb 26, 2024
Last seen: Oct 25, 2026
Profile Activity
Topics: 22 / Replies: 190
AllTopicsReplies
Topic
Surge Protection Devices
8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 74
Views: 13466
Reply
RE: Humidity, or lack thereof

I am currently at 37% RH and it's been at that level for most of the winter season. I believe it comes from the underfloor heating being on 24/7. M...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?

Is there any technical improvements/design changes in the Vaillant aroTherm?  

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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?  

9 months 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...

9 months 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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
MCS - BS EN 12831-1:2017 – Heat Loss Survey
9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 6
Views: 1647
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 ...

9 months 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...

9 months 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...

9 months 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...

9 months 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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Page 8 / 18
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