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Mars
Mars
@editor
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Illustrious Member
Joined: Feb 11, 2021
Last seen: Feb 7, 2026
Profile Activity
Topics: 344 / Replies: 3801
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RE: New Vaillant aroTherm Plus in black - When will it come to the UK?

@crankplus, nope, still not, and I've followed up with Vaillant. Their lips are sealed. But wonder if anyone else has heard anything.

6 hours ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow

@davidb, if the flow has drifted back to near-closed and the adjuster now isn’t doing anything (bearing in mind that I'm not a plumber or heating engi...

6 hours ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow

@davidb there isn’t really a universal 'rule of thumb' number for UFH flow rates, which is why I was careful not to present 1 l/min as the answer. In ...

10 hours ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: If a heat pump can only heat DHW to 50C then what? Issue with 18KW Heliotherm heat pump

@errmm, curious to see if there have been any updates on this project. Please let us know.

10 hours ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Struggling to Find a Top Heat Pump Installer? We Can Connect You With the Best Installers in the UK

@foxesfan, welcome to the forums. I don't have anyone I can recommend in the Northamptonshire area. Hopefully there are members here in your neck of t...

10 hours ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow

@davidb, turn the red bit (see photo) anti-clockwise. 2-3 finger turns should drop it to around 1l/min.

10 hours ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow

Yeah, absolutely, those look closed or open very, very little. You can see it says 0 at the top and 5 at the bottom, which are litres per minute. I'd ...

11 hours ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey

@trebor12345, in my opinion the MCS certificate is functionally worthless to a homeowner beyond unlocking the £7.5k BUS grant. That’s it. Strip everyt...

1 day ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Octopus Cosy 12 Heat Pump Regret: Incredibly Loud, Poor Heating & Constant Hum - Help!

@razz I’d certainly love to hear their rationale for a 4 port… definitely update if they get back to you.

2 days ago
Forum
Air Source Heat Pumps (ASHPs)
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