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Replacing my 18 month old Hitachi Yutaki ASHP

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 36 minutes ago
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3598
01/12/2025 11:05 am  

Posted by: @trebor12345
↑

It's not a sustainable way to run the heating.  

Does it tell us anything else?

I am looking at setting up the WC.

I dont think it tells us anything else other than the time it takes constant for getting the slab to equilibrium at the specific flow temperature (which is useful!)

Posted by: @trebor12345
↑

I have always expressed the view that the HP is oversized, as you have found the Night/ECO setting, I turned it down to 50%.  This is the result.

Turning it to 50% is unlikely to help much.  It wont change the minimum output.  It will clamp maximum output which might slightly moderate what it does after an off period, and thus help a little bit, but this is not on its own the solution to getting stability.  For stability you need to match energy supplied to the slab with energy lost by the house.  Weather compensation is the facility provided by the controller in order to do this.

 


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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