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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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Degrees of Separation
Latest Posts
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@majordennisbloodnok I just noticed that A2A manufac...
By Batpred , 28 minutes ago
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RE: Help me keep the faith with my air source heat pump installation
I didn't know about those, they look like good pieces o...
By JamesPa , 31 minutes ago
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@mkz, that's very helpful. Even if Urban Plumber are no...
By Majordennisbloodnok , 37 minutes ago
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RE: Several AC coupled batteries
That is a good point, a manufacturers can stop trading,...
By Batpred , 1 hour ago
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My first question is why bother with the auto balancin...
By JamesPa , 2 hours ago
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RE: Indevolt Batteries UK Support & Info Thread
Hi @hanno - good question. The range of hybrid invert...
By Transparent , 2 hours ago
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RE: GivEnergy inverter tripping due to over-voltage?
@transparent the inverter was installed in 2021 and afa...
By Tim441 , 2 hours ago
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I share the same experience as @majordennisbloodnok hav...
By Old_Scientist , 3 hours ago
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RE: Say hello and introduce yourself
I hope so, @toodles. It's not often that we see a situa...
By Majordennisbloodnok , 6 hours ago
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RE: Heat pump design review please: 5 kW Vaillant aroTHERM Plus heat pump
@jamespa many thanks, definitely i will give the pre...
By ragtime27 , 17 hours ago
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RE: Heat pump installation quotations
@jamespa I noticed that in the Heat Geek design consult...
By Batpred , 19 hours ago
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RE: Electricity price predictions
Good point, I do expect the bonus of putting my energy ...
By Batpred , 1 day ago
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RE: Daikin ESPAltherma and Home Assistant installation
@bash, something we haven't touched on already relates ...
By Majordennisbloodnok , 1 day ago
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RE: Air source heat pump roll call – what heat pump brand and model do you have?
Vaillant arotherm plus 12kW. Installed March 2025. Ex...
By Harebell , 2 days ago
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