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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 12, 2025
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Topics: 17 / Replies: 2832
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RE: Installing a heat pump in a Grade II listed property

You have a house with an enviously low loss and able to run at an enviously low flow temperature (29C!). I wish mine was like that! At a flow tempe...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Installing a heat pump in a Grade II listed property

Interesting data. Assuming a difference between the intake air sensor and the actual OAT of 2C, and that 600W is contributed from sources other than...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan - Legionella Operation Time and Target Temperature

I would say for sure assuming it connects to the heat pump controller.

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan - Legionella Operation Time and Target Temperature

Many, if not most/all, ASHPs have their own tank sensor. Unlike the immersion thermostat it is analog not on/off so that the ASHP knows the actual te...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

Good luck and no rush. Any new measurements that are made will be easier to interpret when it gets colder anyway.

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

AIT (air intake temperature) and energy will correlate well whatever the IAT is not least because the heat pump controller reacts to AIT alone and the...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

Unless the IAT was in fact 19 when you did the energy vs OAT curve, we need to correct for that!

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

It looked bigger on the charts you posted recently, perhaps more like 2-3 C The difference does make a fair difference to some of the calculations p...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

This confuses me. Do I correctly recall that your heat pump (and more importantly OAT sensor) is in a bit of a well so the OAT sensor doesn't measure...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

Can you please clarify what this graph is, it appears to have both setback and no setback on the same days? Also when you did the AUC calculation re...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

Yes and Yes. Conservation of energy must eventually apply, but may take a long while for equilibrium to be re-attained, and my suspiscion is that in ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

The '10%' refers to the change in deltaT between IAT (20C->19C) and OAT (10C). House loss (which is how the '10%' is being used) is proportional ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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