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Heat Pump Operation in Summer - Valliant 7kW

 
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Air Source Heat Pumps (ASHPs)
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 upnorthandpersonal
(@upnorthandpersonal)
Trusted Member Member
Joined: 6 months ago
Posts: 29
25/05/2026 1:40 pm  

I do the same: cool my large buffer (3000L) to 10C, pump between 14 and 18C water (depending on the humidity) in the underfloor circuit. It works nicely for the one or two weeks of summer we have here.


My blog where I write about all the systems in place and decisions made for my off-grid house at 63 degrees north in Finland.


   
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 Judith
(@judith)
Prominent Member Member
Joined: 3 years ago
Posts: 548
26/05/2026 4:42 pm  

Posted by: @upnorthandpersonal
↑

I do the same: cool my large buffer (3000L) to 10C, pump between 14 and 18C water (depending on the humidity) in the underfloor circuit. It works nicely for the one or two weeks of summer we have here.

 

One or two weeks of summer! 
Since southern England has a heat wave now in May, you know what you’ll get next, possibly 6 weeks of summer!

 


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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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 5 years ago
Posts: 2089
26/05/2026 5:23 pm  

Posted by: @judith
↑

...

Since southern England has a heat wave now in May, you know what you’ll get...

Yup! Summer in Spring.

Wonder if Summer will last until the start of Summer this year 🤔 

 

P.S. Apologies, @judith, for quoting to the point of misrepresentation; I just couldn't resist the comedic opportunity.

 


This post was modified 3 months ago by Majordennisbloodnok

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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 upnorthandpersonal
(@upnorthandpersonal)
Trusted Member Member
Joined: 6 months ago
Posts: 29
27/05/2026 7:16 pm  

Posted by: @judith
↑

One or two weeks of summer! 
Since southern England has a heat wave now in May, you know what you’ll get next, possibly 6 weeks of summer!

 

I think summer here was last Thursday. We're back to 10C during the day here, and the heat pump is running again.


My blog where I write about all the systems in place and decisions made for my off-grid house at 63 degrees north in Finland.


   
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