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Heatgeek
@heatgeek
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Joined: Dec 16, 2024
Last seen: May 21, 2025
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Topics: 1 / Replies: 116
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RE: Performance of Heat Pumps in Mild Weather

@trebor12345 Attached is the document which provides more info.

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@jamespa Quick one for your information. Specs for Hitachi 3HP heat pump which one member of this forum has. Note min/max power. Ratio 2.1/11 = 19%.

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@jamespa There is a lot here but I wish to deal with the fundamentals first. Firstly, you have ignored the statement by Graham Hendra that he has ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@jamespa Firstly, I can confirm that the Daikin heat pump in the example was producing 8kW output during the cold spell in January. Regarding thi...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

On the published graphs, you can put your mouse over any part of the graph to read the actual value at any point. This is NOT a calculation. I am mere...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@jamespa Sorry, I should have added the word "theoretically" as I was trying to rationalise the theory behind Grant's 8C philosophy. Whether heat pum...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@robs Thank you for this. I had forgotten about Ecodan, especially as I have one with its dangly NTC leads. I presume the example is a 5kW unit. This...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@grantmethestrength Do you know what your DT was when you were heating at -2C outside? This will give an indication of what your peak heat load was....

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Performance of Heat Pumps in Mild Weather
2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 52
Views: 1457
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RE: Is my Samsung heat pump working too well?

@pooneil I have a Gen 4 Samsung. The setting on mine is 25C @ 15C. 25C is the lowest base temperature and the flow at 16C or 17C will still be at 25C....

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is my Samsung heat pump working too well?

@pooneil It sounds like the settings are all over the place and you are maybe misunderstanding some things. Let’s get back to basics at the risk of te...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is my Samsung heat pump working too well?

@bontwoody If you look at the diagram, at 19.00 when power is over 3kW, the DT is 5C. If you look around 11.00 when power is ~2kW, then DT is 3C. In b...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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