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Last seen: Oct 3, 2026
Could the Building Reg inspector not use some certificate issued by the installer on a self certify basis? Or any similar mechanism to obviate the nee...
Yes, often it goes up much quicker than it comes down..
@jamespa One reason is that the Arotherm Pro is currently awaiting inclusion in the ENA database (so not marked as "connect and notify"). This appr...
@annab Regarding the brands, the ones you mention are very common. Mitsubishi make R32 and also the newer R290 models, Vaillant Arotherm are all R2...
@jamespa It seems the Arotherm pro VWL 75/7.1 A 230V complies with IEC 61000-3-12 , exactly the same standard as the Arotherm Plus and the same lim...
@majordennisbloodnok We have a sort of inflatable rubber with a pipe, so there’s enough airflow to keep it dry…
We still have a gas fire for backup. The last gas engineers that visited got a bit excited when they noticed the rubber protruding and blocking the ch...
We had a discussion elsewhere about protection devices and specifically the type of RCDs required by some heatpumps. Vaillant specifically collaborate...
Not having a breakdown was not a problem in itself. The challenge was when we looked for different locations for the install, types of cylinders or nu...
I ran a quick check using This is what it says: Based on 14,313 kWh gas annually, the implied heat loss range is 4.8-7.2 kW. Your estimate of 9 k...
Absolutely no issues, I find it very useful. It seems I helped to derail the thread from the Helium future.. Not at all, thank you for the e...
@majordennisbloodnok @jamespa I stand corrected, A2A need defrost cycles just like A2W! 🙂 But on the relative efficiency, given that the...
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Latest Posts
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RE: Replacing Storage Heaters with a Heat Pump in a Stone Cottage
Excellent find, thanks for posting the link here.
By cathodeRay , 17 minutes ago
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RE: How should the Boiler Upgrade Scheme be reformed?
It's the reverse, the hybrids need less space. The back...
By Temperature_Gradient , 28 minutes ago
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Over the years, due to the non barrier PEX underfloor h...
By bobflux , 13 hours ago
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RE: Getting closer to a finished Haier system
All the 45° elbows required for getting the primaries i...
By Singlespeed , 14 hours ago
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RE: Tesla Powerwall (2) Calibration Cycles
@papahuhu Likewise, the main ‘extra’ relates to TOU tar...
By Toodles , 20 hours ago
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RE: DIY Heat Pump Installations: Navigating Legal and Regulatory Hurdles
Thanks for the reference @jamespa I can't see any te...
By Transparent , 2 days ago
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RE: battery storage without solar
Indeed, current on the grid input = current used for ch...
By bobflux , 2 days ago
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RE: Who's your electricity provider and what's your tariff?
@papahuhu @papahuhu A lot of tears and sweat went into ...
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RE: Solar Power Output – Let’s Compare Generation Figures
We have the same problem, 12 mature trees clip the morn...
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I had a battery and inverter installed a while ago, my ...
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RE: Is This Initial Free Quote From Octopus Trusted Partner Reasonable?
@ltron2 The EPC on our house is A-92, however that i...
By Rob of York , 3 days ago
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RE: Heat pump branding. Clever, contemporary… or a bit too much?
The layout is confusing - much better like this: We b...
By downfield , 4 days ago
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RE: Is it just me, or does tradesperson timekeeping and communication drive you absolutely mad?
My experience, backed up by opinions from various frien...
By Majordennisbloodnok , 4 days ago
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RE: Analysis of the economics of switching to an A2W ASHP compared to other heat sources
I had a meeting today with a company based out of Swede...
By Mars , 5 days ago
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RE: Review your electricity provider
We were with Octopus in our old house and it was fault...
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