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SUNandAIR
SUNandAIR
@sunandair
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Joined: Dec 30, 2022
Last seen: Dec 19, 2025
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Topics: 5 / Replies: 503
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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

Apologies for late arrival to this thread. Accepting the obvious and hidden problems with this installation… Is it fare to say it may be easier to p...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Our 11kW Ecodan and its inconsistent data...

@derek-m another query I have in the back of my mind is how the energy consumed by the immersion heater is being calculated. in certain circumstance...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

The attached sheet came from the Ecodan Data files Posted by @mjr ( thanks for that) And is for the Ecodan PUZ-WM85-VAA Can anyone explain. This...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: My Mitsubishi ASHP has used 1078kWh from 25 November to 31 December – Help please

Hi @Harriup i thought I ought to add some comments on this for Sarah to consider. Theres a good reason why there is a flow rate range quoted, and ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: How to set the warm end of the weather compensation curve when it's not warm

On reading about your large windows and solar gain - there is usually other times of the day or on exceptionally cold day when large windows - even tr...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

Thanks for info @william1066 and @kev-m interesting article. Also flow volume for our Ecodan 8.5 are easily met. Rad volumes = 111 litres 28mm ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

HI Mike Can you point me in the direction of the article you refer to above. Also - when removing a LLH, is there a way of calculating the require...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

Just to recap and summarise on earlier posts: We had seen a small loss of temperature across the Flow Pipes as the water passed through the Low Loss...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

yes. Quote right, accuracy and 1c increments could lead to a skewed interpretation especially when we are only looking at 1or 2c variations. ive tri...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

Thanks for your comments Ian, it’s very much appreciated. Half the battle has been understanding and using the correct terms and acronyms, and realis...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

not sure of the “where” bit of your question - the DT I mean is the temperature differential between Primary Flow and Primary Return. These temperatur...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Low Loss Header is losing 1.5c from flow temperature

Hi @derek-m The temperature difference of 1.5c is between Primary flow thermistor and Secondary flow thermistor. See sketch for positions and approx d...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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