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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 17, 2025
Profile Activity
Topics: 17 / Replies: 2696
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RE: Questions on my Hitachi Yutaki SCombi Heat Pump

OK, thats good and low. With low flow temperatures like this there is less to be gained by operating weather compensation than if you were operating ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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

4 months ago
Forum
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...

4 months ago
Forum
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

4 months ago
Forum
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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