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Last seen: Oct 21, 2026
@lizzie that is useful info, thanks. I’m currently considering external shutters to try and reduce solar gain as our house typically heats up to over...
@ian-s I too can provide some insight. We have a Cosy 9 along with 10kW PV and 16kW of battery, 8kW inverter plus an EV. The batteries are charged u...
@ian-s that would point to a 5kW heat pump being sufficient assuming you want the same temperatures across the house. These ought to be considered 15...
@jamespa I used 9MWh of gas but the heat loss was originally calculated at around 8.5kWh and a 9kW heat pump installed. It was subsequently recalcula...
For some reason, never explained, Aria use a buffer. However, it would also seem they know what they are doing and it doesn’t cause issues. Probably...
Did you see the post on Facebook where an air conditioning module, plumbed into the wet circuit and powered by the Cosy was shown? Only a prototype a...
It never takes much to drag something off-topic. At least this forum never succumbs to Godwin’s Law!
@transparent It seems to be designed that way - from their support page: ..... Pen Fault Detection A PEN fault refers to a problem with the prote...
@transparent I'll try and answer this as best I can. My house looks like your TN-CS (PME) image: there is an earth lead directly back into the servi...
@tim441 They did that last year: fitted a voltage recorder for a week and then took it away to analyse the data. They agreed that it was reaching vol...
Not in writing, just a phone call but the chap said it had been logged so....I haven't had a chance to contact them yet but I will do so. My inverter...
Ah ha! People are paying attention 😀! My mistake, they said they would upgrade it. I’ll chase it and ask if switching phase would help. &n...
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Latest Posts
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
... And that's being generous! I'll tell you a littl...
By SusannaSaunders , 4 hours ago
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RE: Adding data centre electricity costs to domestic energy bills?
never ceases to amaze me.. Keeping steel works going ...
By Batpred , 5 hours ago
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RE: Electricity price predictions
great session Reminds me why some politicians can be ha...
By Batpred , 5 hours ago
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RE: Boiler Upgrade Scheme funding reduced by circa £750 million in 2026 budget
Absolutely agree. The massive Hager CU my vaillant requ...
By Batpred , 5 hours ago
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RE: Why don't people choose heat pumps?
With a heatpump tariff, it should be cheaper to operate...
By Batpred , 6 hours ago
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RE: How much of your renewable and home setup would still work if the internet went down?
absolutely agree. even if many providers see that extra...
By Batpred , 6 hours ago
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RE: Octopussy cosy 6 experience
People who have a Cosy appear generally to be happy wit...
By JamesPa , 9 hours ago
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I thought the cr*p came first and the biofuel came afte...
By Majordennisbloodnok , 13 hours ago
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RE: Aerotherm and weather compensation
@jamespa I replied yesterday with detailed readings whi...
By DavidB , 2 days ago
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RE: Marvel Heating liquidation
@editor This is an important point. each winter, you...
By davidnolan22 , 3 days ago
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RE: Solar Power Output – Let’s Compare Generation Figures
Very nice. we’ve been super soggy here, but rather m...
By Papahuhu , 3 days ago
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RE: DIY powerflushing tutorial
Interesting! I toyed with the idea too. But I installed...
By bobflux , 4 days ago
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews Agree with the others on sequence: loft first...
By mk1234 , 4 days ago
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RE: Vaillant ecoTEC Plus - Flow Temp and Set Up
Heating been on for 4 weeks now, continuous. It's 6C o...
By trebor12345 , 5 days ago
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