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SimonF
@simonf
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Joined: Dec 5, 2025
Last seen: Feb 4, 2026
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Topics: 0 / Replies: 5
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RE: Help me keep the faith with my air source heat pump installation

@adamk You may want to get Vaillant to deal with it under warranty rather than the installer. In my case the installer opened a case with Vaillant. A ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

@adamk In my experience the gap widens when the outside temperate increases, so could be that. Or maybe just down to the way the swapped sensors have ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

  I agree and that’s why I don’t believe a lot of the high COPs that get reported on Vaillant units. It’s a shame Vaillant don’t calibrate th...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

@adamk This shows that the sensors in your heat pump are not accurate. A not uncommon problem for Vaillant units. Therefore the COP reported by the un...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

@adamk You can get an idea of if your flow and return sensors are accurate by measuring the difference between flow and return temps around 10 minut...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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