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DavidB
@davidb
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Joined: Jan 30, 2026
Last seen: Apr 13, 2026
Profile Activity
Topics: 4 / Replies: 39
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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.

2 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.

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

January info  

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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.

2 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...

2 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

@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...

2 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...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow
2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 13
Views: 884
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

@adrian thanks for the explanation Adrian. Sounds as if I should experiment with pure weather compensation for a day or 2, keep the stove off and see...

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

@jamespa thanks to both you and Adrian for the comments and suggestions. In one regard I am confused about your comments on our wood burner and impac...

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

@johnnybudith Thanks for all the information. It’s really helpful to know it’s out there. Up to now I have been trying to get help from Vaillant cus...

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

@judith Thanks for the article. So far a rapid skim read suggests this may well be helpful. Not least to explain some of the capabilities of the sof...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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