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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 16, 2025
Profile Activity
Topics: 16 / Replies: 2624
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RE: Questions on my Hitachi Yutaki SCombi Heat Pump

Can I suggest you read (if you havent already) this 'starters guide' to heat pumps? I think you may be getting things confused. Firstly dont wo...

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

The guy was right as regards buffer tanks, avoid. However a 2 port volumiser is ok. Unfortunately terminology isn't quite consistent. Check that it...

3 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Is it KISS or constant – weather compensation vs. set flow temperature?

@cliffhanger Mine has a 'space heating off' setting! Otherwise turn down thermostat if you have one and it's set up to call for heat

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

That's a good analysis. Presumably heat pump manufacturers design on the assumption that the heat pump is right sized. The typical oversized heat pu...

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

@adamk Sounds encouraging, what about any independent measure of total loss eg from current gas/oil consumption. Rooms share heat to a fair extent s...

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

I apologise if this has been covered already but have you got any way to sense check loss calculations eg from past usage. The two, three hour full p...

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

@heatgeek I feel this may all be heading towards a conclusion that there are a set of trade offs in compressor modulation range and cycling. Without ...

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

Thanks for that. The ecoforest graph of cop Vs compressor speed explains a lot. Perhaps it even explains how Daikin appear to do a single compressor...

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

1.8kW is at 7C, the more interesting figure I think is the min at say 12-15C. That doesn't appear to be specified for the Hitachi, but for the heat p...

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

@heatgeek @robs I was going to say exactly what @robs has said. The interesting metric is the ratio between min output at high OAT/low FT and max ou...

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

2 port buffer/volumiser is fine, will help with defrost/system volume and no downsides. 2 ports good, 4 ports bad! The general rule for rads is to ...

3 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

The full sentence was "larger radiators = lower flow temperature and larger system volume. The latter certainly would be expected to reduce cycling...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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