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What happens when the outside temperature exceeds the upper WC point?

 
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Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 2 years ago
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 Judith
(@judith)
Prominent Member Member
Joined: 3 years ago
Posts: 554
05/04/2025 12:07 pm  

@jamespa not found the hysteresis to be a problem yet. The house warms up a lot in the sunshine so it’s only back to our desired temperature by later in the evening, if at all (high thermal mass). We toggle between ‘active’ and expanded depending on the amount of sun.

I might turn the setting of outside temperature down further (present 17C) in summer to prevent any heating on a cool night. Happily fiddling right now!


2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with SCOP >4) open system operating on WC


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 6 years ago
Posts: 4965
07/04/2025 7:56 pm  

The focus of this week’s podcast recording is on “Heat Pumps & What To Do in Warmer Weather” and I’ll pull questions from the the thread so far, but if anyone has other questions on this subject, please pop them below, DM or email me (editor@renewableheatinghub.co.uk)


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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 6 years ago
Posts: 4965
23/04/2025 8:57 pm  

@bontwoody asked your question at the start of this thread to the panel. An interesting reply from Graham Hendra.


Dad’s Outside with the Heat Pump Again
He wanted to save the planet. His family just wanted him to come inside.
Get the book → · Free UK shipping
The Ultimate Guide to Heat Pumps · Britain’s Heat Pump Shitshow
Heat Pumps Explained · From Zero to Heat Pump Hero · Bodge Buster
From Zero to Heat Pump Hero and Bodge Buster are rewritten and updated for 2027.
New to heat pumps? Heat Pump Fundamentals course — 50% off with INTRO50.


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 5 years ago
Posts: 1063
Topic starter 23/04/2025 9:38 pm  

@editor Thanks Mars. Interesting talk. I will just point out however I don’t actually run my heat pump at 40C when it’s 17C outside! Don’t know why I plucked that figure from the ether 😆


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
10kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 6 years ago
Posts: 4965
23/04/2025 9:51 pm  

@bontwoody 😂 does your unit turn off when a specific OAT is hit?


Dad’s Outside with the Heat Pump Again
He wanted to save the planet. His family just wanted him to come inside.
Get the book → · Free UK shipping
The Ultimate Guide to Heat Pumps · Britain’s Heat Pump Shitshow
Heat Pumps Explained · From Zero to Heat Pump Hero · Bodge Buster
From Zero to Heat Pump Hero and Bodge Buster are rewritten and updated for 2027.
New to heat pumps? Heat Pump Fundamentals course — 50% off with INTRO50.


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 5 years ago
Posts: 1063
Topic starter 24/04/2025 5:21 am  

@editor not via the WC curve but as @old_scientist mentioned the setting is in the FSV menu so I was able to set that to 19C rather than it’s default of 35 C OAT


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
10kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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