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webcmg
@webcmg
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Joined: Jan 5, 2022
Last seen: Dec 25, 2025
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Topics: 3 / Replies: 108
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RE: High air source heat pump running costs – Vaillant AroTherm Plus

@Derek-M what was the solution to this issue?

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

No not yet, I don't have the right gear to monitor. Just paying £14 a day currently...:(

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

I don't have equipment to measure the temperature accurately (plumber did the last readings), but with an infrared laser thermometer I'm getting UFH...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@alec-morrow you can see it here. The rads are definitely coming off the bottom two. If switched, won't that mean the UFH is too cold though given the...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

First picture uploaded was a bit small.

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@colin not that I can see, just a Grundfos pump set to level 3 (highest speed). Pipes feel cold when the UFH is on and warm when it isn't. That valve ...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@colin not that I can see, just a grundfos pump set to level 3 (fastest) @derek-m - here are some photos of the buffer tank. There are four pipes co...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@mattengineer I have been told the radiators have been oversized to the requirements of the ASHP system. The radiator on the landing is a triple radia...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

Hi @derek-m There are little caps on top of the manifold, which are between 2.5/3 when the heating is active. I assumed this was litres per minute,...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@alec-morrow I'm coming to the realisation that this is indeed the problem. There is a single zone and no electronic mixer. We have a VRC700 indoors i...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@colin do you know or can you measure the flow temp to and from your radiators and ufh? Upstairs still freezing, rads cold despite 3 litres per minute...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

Posted by: @colin Posted by: @webcmg @colin You know you want to get the problem sorted when you get out of bed to set this up! I also ...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
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