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DavidB
@davidb
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Eminent Member
Joined: Jan 30, 2026
Last seen: Mar 2, 2026
Profile Activity
Topics: 3 / Replies: 34
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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 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow
4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 13
Views: 320
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 weeks 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...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

4 weeks 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...

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

@jamespa Thanks for your thoughts James. The idea of monitoring with Home Assist is certainly attractive and new to me. However I know my IT skills ...

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

Another factor which might be working against us is the heat demand of our house is low. It was subject to a deep renovation with lots of insulation....

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

@judith Thanks Judith - that is a interesting comparison. As you say, my COP is not awful but I feel it should be better. Your 4.8 is the sort of fi...

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

@bontwoody maybe I have missed something but I thought time of use tarrifs depended on an operating smart meter to record usage??

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

@jamespa Yes to all the assumptions although I haven’t tried reducing below 0.6. On installation the engineer set to 0.9. what is home assistant?...

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

Thanks for the response. 3.5 is well below the 4 plus suggested pre sales and I would like to coax all I can from the system. Suggestions for tweaks ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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