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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 1 month ago
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 Scalextrix
(@scalextrix)
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15/09/2025 8:39 am  

@jamespa talking of being old, the house where I grew up had a multi zone heating system.  Downstairs had radiators, upstairs didn't 😂

I remember scratching my name onto the frost on the inside of my bedroom window.  Curiously I don't ever remember feeling cold though 😁

Now we (rightly) get upset if the room doesn't get upto temperature, how times have changed.



   
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 JamesPa
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15/09/2025 8:50 am  

Posted by: @scalextrix
↑

@jamespa talking of being old, the house where I grew up had a multi zone heating system.  Downstairs had radiators, upstairs didn't 😂

I remember scratching my name onto the frost on the inside of my bedroom window.  Curiously I don't ever remember feeling cold though 😁

Now we (rightly) get upset if the room doesn't get upto temperature, how times have changed.

And we (or at least some) expect to be able to do 5-4 showers in quick succession every day, and many other (largely luxury) thinks we now take for granted.

And yet people still aren't satisfied and moan about their lot.  Really?

 


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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Toodles
 Toodles
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15/09/2025 8:58 am  

@jamespa Your Mum used it? I still do! But, then I’m 78 in a couple of weeks😉 Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 Scalextrix
(@scalextrix)
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15/09/2025 8:58 am  

@jamespa things were shit in the "good old days", but we were happy anyway 😂



   
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Toodles
 Toodles
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15/09/2025 9:16 am  

@scalextrix ‘You had a shoe box?’😉


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 JamesPa
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15/09/2025 9:20 am  

Posted by: @scalextrix
↑

things were shit in the "good old days", but we were happy anyway 😂

Yup

Sadly consumerism, the foundation of our economy, depends on making us unhappy and thus buying ever more stuff to keep up with the neighbours or temporarily deal with our unhappiness. 

This is of course totally unsustainable, but the lemmings have been 'educated' by the largely shallow self-interested media not to see that and as a result many vote for whichever self-interested individual tells them the lies they want to hear thus sealing their own, and more particularly their childrens' fate.  

It's somewhat depressing.


This post was modified 2 months ago 6 times 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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Toodles
 Toodles
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15/09/2025 9:36 am  

@jamespa The dormitories at my boarding school (in Exeter) had ice formed on the inside of the windows (single glazed of course) and that ice would sometimes be resident for several days at a time. Meanwhile, at home in Somerset, we had to keep a coal fire burning throughout the summer if we required any hot water as a back of fireplace heat exchanger mechanism was all we had. My Dad eventually installed an immersion heater in the DHW tank in about 1958/9 to alleviate the situation in our ‘shoebox’.😉 Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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Mars
 Mars
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Topic starter 15/09/2025 5:52 pm  

Day one is done.

The system’s been fully flushed and cleaned, and every lockshield has been swapped out for FRVs. They look fantastic and they’ve already exposed major flaws in our system (two in fact!).

This is shaping up to be an epic project and a huge learning experience. We’ve also filmed the first part of our video and we’re off to a flying start.

Short updates to follow this week before we unleash our content.

FRVs

Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
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GrahamF
 GrahamF
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16/09/2025 7:06 pm  

@editor your engineer's attitude is truly horrifying.  I suspect he realises that he messed up, but can't bear to face up to it.

Anyway, once The Maestro has sorted it out, you will have dramatically improved performance and demonstrably reduced heating bills.  Then, your position will be incontrovertible. 

Of course, what you do with that information will be up to you.


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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Mars
 Mars
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Topic starter 18/09/2025 9:12 am  

Day 2 was a beast. All the excess zoning, on/off stats and buffer related piping, plumbing and wiring is gone. Day 3 is about putting everything back to together as an open zone and balancing all our emitters. I'll make sure @heacol gets regular coffee throughout the day to help him power through.

Ripped out

Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
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Transparent
 Transparent
(@transparent)
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18/09/2025 9:46 am  

There's a couple of motorised valves I can see there.
Put them on ebay, and you'll be able to cover the cost of Brendon's coffee for the duration.

How much insulation wall thickness is left, I wonder, after compressing it with nylon cable-ties?

WallThickness

 

Posted by: @grahamf
↑

your engineer's attitude is truly horrifying.  I suspect he realises that he messed up, but can't bear to face up to it.

If it weren't for that original installer, none of us would be here on this forum.


This post was modified 2 months ago by Transparent

Save energy... recycle electrons!


   
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GrahamF
 GrahamF
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18/09/2025 10:10 am  

@editor this is exciting!  It will be great to hear how things go.


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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