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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 14, 2025
Profile Activity
Topics: 18 / Replies: 3371
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RE: The UK’s Heating Nightmare: Why Many Systems Fail Homeowners

I agree with the inference from this comment, namely that weather compensation has been mandated elsewhere for many decades. We didn't which, IMHO, w...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: The UK’s Heating Nightmare: Why Many Systems Fail Homeowners

They definitely can be run on pure WC, and arguably its the best method (albeit probably using a temperature sensor as a limiter). However they have ...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: The UK’s Heating Nightmare: Why Many Systems Fail Homeowners

Which are... Is there even a heat pump available that either doesnt have an internal IAT sensor or cant take an external thermostat input as a limit s...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: The UK’s Heating Nightmare: Why Many Systems Fail Homeowners

@jancold I tend to agree with your analysis The summary says this: Class I – A room thermostat that controls the on/off operation of a heat...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: The UK’s Heating Nightmare: Why Many Systems Fail Homeowners

I agree that the UK heating industry is well behind the curve, which accounts in part for the poor heat pump installations that plague this site. The...

11 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Heat Pump SCOPs – The Truth Might Not Be What You Think

Pump speed needs to be sufficient to carry away the energy, any less wont do, any more is wasting energy. The energy carried away is flow rate (l/s)...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

That's exactly what my analysis above would predict. After the rise in oat the bit of the house you live in continues, for a while, to lose energy t...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

This is definitely an interesting scenario. What I think happens is this. The house fabric starts (when it's cold) with a thermal gradient continual...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

Phew! I thought I was going mad. In terms of #2 rapidly warming OAT is an interesting phenomenon in terms of understanding the thermal dynamics of a...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the Bleak Midwinter... Midea heat pump performance, poor COP and windchill in action

I'm now a bit confused. I thought we had more or less proved that the problem lies with the water pump and thus there is insufficient flow of heat fr...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Baffled by heat pump size/ choice!

More expensive, larger, louder and won't modulate down so low and are thus less efficient for space heating if the house doesn't need it. If you real...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Baffled by heat pump size/ choice!

Yes, sorry for any confusion. 10C is sometimes quoted as the temp of incoming mains (being, I presume, roughly the temp underground at the level the ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Page 175 / 283
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