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DavidB
@davidb
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Joined: Jan 30, 2026
Last seen: Jul 6, 2026
Profile Activity
Topics: 6 / Replies: 54
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RE: Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow

@bornagain Thanks for the comments and comparison with your own system. My understanding is that the flow rate should automatically adjust to provide...

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

Hi everyone, As I get to know my 3.5kW Aerotherm instal I have had a number of calls with Vaillant tech support. A recent call turned up info that t...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help needed to adjust weather compensation on Vaillant air source heat pump

Thanks for the posts and ref to the video - all of which largely reinforce what I believed I had understood and informed the way I have our system set...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Help needed to adjust weather compensation on Vaillant air source heat pump
5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 15
Views: 2489
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

@jamespa Thanks for the commentary and reassuring comparisons with your own much larger system. The energy consumed of 281kWhrs produced heat of 893...

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

@editor thanks for the tips which I will try before calling my installer on Monday. Again much appreciated.

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

Yield info for January. I live on a Scottish island.

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

January info  

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

Thanks for requesting this info - I hadn’t seen this data before. Live and learn. Not sure if 1000 cycles is good or bad or period of measurement.

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

Update - I have been checking the UFH return manifold, waiting on a rise in temperature. Response was fairly slow so I figured the heat was being abs...

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

@steelbadger yes, HP running “normally” and, if you have seen some of my other thread, I have no stove burning. I have the system in active mode - so...

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

@editor so simple, thanks. Reevaluating what I was seeing, the valve was only just cracked open. It meant the flow pipe was warm a meter away from th...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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