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MatWin
MatWin
@matwin
Member
Eminent Member
Joined: Mar 15, 2025
Last seen: Feb 4, 2026
Profile Activity
Topics: 1 / Replies: 19
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RE: Air Changes per Hour - ACH and the MCS requirement

Hi Trebor We have a 1905 house with EPC B. We had an "Air Permeability Test Certificate" of 9.76 m³/(h·m²) @ 50 Pa and we went with ACH 0.5 (which...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Air source heat pump roll call – what heat pump brand and model do you have?

Manufacturer: Vaillant Model: Arotherm Plus 7kW Type: ASHP Arrangement: Mono Area of Country: Hampshire, England Home Type: House Size: Sq...

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

@ashp-bobba I definitely recommend offering the blower test for the benefits stated. Unless it is a relatively new build with an already known ACH...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Say hello and introduce yourself

@editor maybe we can start a topic for everyone to chip in what they know about wasteful kWh consumption?

9 months ago
Forum
Introductions, Forum Rules & Updates
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RE: Say hello and introduce yourself

@transparent thanks for this, good info. Worth making a handbook (with Mars?) with a littel more substantiation of how much these items consume. Many ...

9 months ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: Air Changes per Hour - ACH and the MCS requirement

update - my old installer insisted on a heat loss of 11.1kW, mainky because of the MCS air change values. I got a £350 blower test this week which dem...

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

@jamespa thank you so much for addressing my questions so clearly. I knew MCS standard ACHs were unjustifiably high and I will go ahead with a bl...

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

@sheriff-fatman thanks and good luck with your installation

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

@majordennisbloodnok thanks. I didn't know about the MCS change

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Air Changes per Hour - ACH and the MCS requirement
10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 40
Views: 3089
Reply
RE: Say hello and introduce yourself

@jamespa thanks yet again James. Very clear and usable insights. As a complete newcomer to SHPs I have to say that there is room for your advice and...

10 months ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: Say hello and introduce yourself

@cathoderay thank you, that is a very helpful reply. shark infested water... manufacturers can mislead with model sizes installers serve themse...

10 months ago
Forum
Introductions, Forum Rules & Updates
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