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Help me keep the faith with my air source heat pump installation

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 hour ago
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3318
05/11/2025 9:28 am  

Posted by: @adamk
↑

@jamespa hopefully after the rad balancing it will perform better, as I think at the moment the water is short circuiting back to the hp through the fully open lockshields, though I’ve done some very basic balancing recently to see if it helps. Essentially I don’t think the hp is seeing the whole system due to the unbalanced rads.

Let's hope so.  It will be interesting to observe whether they balance for deltat or for room temperature.  I'm guessing the former as it's easier.  It's also a good starting point from which to tweak to get room temps right, if the loss calculations were sufficiently out to affect them materially.

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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DREI
 DREI
(@drei)
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Joined: 3 months ago
Posts: 76
05/11/2025 9:52 am  

Sorry to ask a silly question, but how to you actually balance your radiators?



   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
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Joined: 4 years ago
Posts: 1110
05/11/2025 9:55 am  

Posted by: @drei
↑

Sorry to ask a silly question, but how to you actually balance your radiators?

Not a silly question in the slightest, @drei.

We even have an article for it. Heat Pump Radiator Tuning | Renewable Heating Hub

 


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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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3318
05/11/2025 10:01 am  

Posted by: @drei
↑

Sorry to ask a silly question, but how to you actually balance your radiators?

There is no such thing as a silly question!

@toodles wrote an article on balancing radiators:

https://renewableheatinghub.co.uk/radiator-balancing-lockshield-valve-guide/

You can balance for equal deltat or for room temp.  The two are the same if the design is perfect, which of course it isn't.  A good way is probably first to balance for deltat and then tweak from there.

I found it fairly easy over a period of a few days.  Rooms share heat so it doesn't have to be that accurate to give a comfortable result.


This post was modified 1 hour ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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