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Last seen: May 10, 2026
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...
Manufacturer: Vaillant Model: Arotherm Plus 7kW Type: ASHP Arrangement: Mono Area of Country: Hampshire, England Home Type: House Size: Sq...
@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...
@editor maybe we can start a topic for everyone to chip in what they know about wasteful kWh consumption?
@transparent thanks for this, good info. Worth making a handbook (with Mars?) with a littel more substantiation of how much these items consume. Many ...
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...
@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...
@sheriff-fatman thanks and good luck with your installation
@majordennisbloodnok thanks. I didn't know about the MCS change
@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...
@cathoderay thank you, that is a very helpful reply. shark infested water... manufacturers can mislead with model sizes installers serve themse...
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