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Repiping and Reconfiguring our Heat Pump System Including Removing the Buffer Tank - Heat Pump Retrofix

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 53 minutes ago
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GrahamF
 GrahamF
(@grahamf)
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Joined: 5 months ago
Posts: 56
03/10/2025 7:32 am  

@editor thanks for being so open about all this.  All of us like to be open about our successes, but it takes courage to admit when things have gone wrong.  I’m sure the combination of your optimism, determination to make it work and an excellent engineering team will win through in the end.

 


Grant Aerona 290 15.5kW, Grant Smart Controller, 2 x 200l cylinders, hot water plate heat exchanger, Single zone open loop system with TRVs for bedrooms & one sunny living room, Weather compensation with set back by room thermostat based load compensation


   
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 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 2983
03/10/2025 8:37 am  

Posted by: @editor
↑

It has also clarified our next step: in spring we’ll be undertaking a full heat pump retrofix project. The goal is to create a proper blueprint for reconfiguring a system with microbore, long pipe runs and a large footprint. We want to show homeowners and installers not only what bad looks like, but what good looks like, and how thoughtful design, planning and calculation make all the differen

I congratulate you on your determinism and, lihe @Grahamf an sure that this plus some robust engineering will win through.

I don't know much about your house but it sound like its quite atypical of the UK housing stock, so its going to be interesting and instructive to see how far from the very simple model that (I suspect and believe) applies to the vast majority of houses must, in practice, be varied for yours. This might establish some 'bookends'.  At one end (and applying to the the vast majority of houses) just properly sized heatpump, diverter valve and UVC (+ necessary grot filters and antifreeze valves) with no external controls and, at the other end - what?  It also looks like, from what you have said so far, you are going to be looking at the latest technologies whihc will also be instructive.

The challenge remains to get the industry and/or householders to take notice in volume.  If we could also crack that there would be far fewer poor installs and the chancers in the industry would either have to get their act together or go out of business.


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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