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DavidB
@davidb
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Trusted Member
Joined: Jan 30, 2026
Last seen: Jun 13, 2026
Topics: 6 / Replies: 51
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...

4 months ago
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.

4 months ago
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

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

4 months ago
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.

4 months ago
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...

4 months ago
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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...

4 months ago
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...

4 months ago
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...

4 months ago
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...

4 months ago
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