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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

@colin my cylinder boost offset was 25k, so you know what this actually means?

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

@colin thank you, does your cylinder definitely hit the required temperature?

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

@colin hi Colin, any chance you can share your anti legionnela settings? System used 8kwh on this cycle last night and temperature is only reading 48 ...

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

Thanks, I was thinking of IWI on the entire room. The water to 46 deg and averages about 4kwh over the last few days. What are you doing with the exce...

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

@robl cheers, are you suggesting removing and putting IWI behind the heat exchanger box? Or just around it? Out of interest, where would source insu...

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

@robl thanks for the reply. Your assessment of A, B, C is spot on. The garage isn't completely uninsulated but the loft space insulation can definitel...

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

Thanks, we're in a new build so not planning on replacing showers just yet. How would you approach better insulating this setup? Is the fact the DHW t...

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

Thnks, I would be interested to know what settings you use. Assume it isn't on 'constant' and that it is set for a significant drop off in temp before...

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

Vaillant have made some recommendations on changes to the system, I'm not convinced they'll address the issue and it will be difficult to know until t...

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

Yes, but if the radiators aren't even warm... Then it's unlikely the room will be warm either. Quick update. Vaillant have been investigating, no real...

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

@derek-m It's hard to tell because it's been warmer outside (10 degrees today) and I had to put the heat curve up to 0.9 in order to get any heat in t...

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

Hi @derek-m - the plumber popped over today so was able to get some readings which are as follows: BufferFlow 34Return 31 Radiator circuitFlow 34R...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
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