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The good, the bad and the not that great – my heat pump installation

 
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Air Source Heat Pumps (ASHPs)
Last Post by cathodeRay 2 weeks ago
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Transparent
 Transparent
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10/02/2025 3:23 pm  

Aagh!

Sorry James.
I clicked the wrong Edit button!

Read here

image

Yes, the knob has an adjustment for pressure...
... but it's also a filter (unless the installer removed the cartridge).


This post was modified 7 months ago by Transparent

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Transparent
 Transparent
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10/02/2025 3:25 pm  

Posted by: @jamespa
↑

Regarding the w/machine its very odd that the hot water is high pressure but there isnt sufficient pressure to fill the machine. 

I suspect it's a "Cold Fill" only machine.


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 JamesPa
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10/02/2025 3:39 pm  

Posted by: @transparent
↑

Yes, the knob has an adjustment for pressure...
... but it's also a filter (unless the installer removed the cartridge).

 

I didnt realise that they also had a filter, but it makes sense.

 

Posted by: @transparent
↑

Posted by: @jamespa
↑

Regarding the w/machine its very odd that the hot water is high pressure but there isnt sufficient pressure to fill the machine. 

I suspect it's a "Cold Fill" only machine.

Me too, but either the cold fill is fed from the 'mains' (actually water from a well) or its fed from cold outlet of the inlet group to the DHW tank, which will be at the same pressure as the DHW.  The former must (presumably) be higher pressure than the latter and OP says he has problems with too much water pressure on the hot.  

 


This post was modified 7 months 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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 Dwynwen
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10/02/2025 3:47 pm  

@jamespa DHW - direct hot water? Large tank labelled Kodiak? Or should I be looking for another tank. Know most of old, rather agricultural, plumbing was removed and presumably replaced.



   
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 JamesPa
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10/02/2025 4:18 pm  

Posted by: @dwynwen
↑

@jamespa DHW - direct hot water? Large tank labelled Kodiak? Or should I be looking for another tank. 

Domestic hot water and yes its the large tank labelled Kodiak which, hopefully, is the only tank they fitted.

 

Posted by: @dwynwen
↑

@jamespa Know most of old, rather agricultural, plumbing was removed and presumably replaced.

Ah, that may account for increased pressure in the hot water.  This would be described as a 'upgrade'!

Transparent and I now agree what the grey valve/filter does so you can use either approach to reduce hot water flow (but I would just try the lever valve first - its the simplest by far!)


This post was modified 7 months 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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Transparent
 Transparent
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10/02/2025 6:16 pm  

This graphic is mainly for @jamespa and I to chew over,
and particularly the pipe I've annotated in light purple.

image

The only question for @dwynwen is to clarify if the pipe labelled in light green is connected to anything.
We can't see that in the photos.

 

Note to James: I too have a well.

That means my house has several different pipes which carry cold water.

To ensure that cold water being fed to the showers and bath is at the same pressure as the hot supply,
I have one cold pipe-network which gets fed from the same pressure adjustment valve as feeds into the hot tank.

Is it possible that the installer has used the 'wrong' cold supply pipe in @dwynwen 's  house?

Is that why he's seeing pressure differential when there shouldn't be any?


This post was modified 7 months ago by Transparent

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 JamesPa
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10/02/2025 6:21 pm  

Posted by: @transparent
↑

This graphic is mainly for @jamespa and I to chew over,
and particularly the pipe I've annotated in light purple.

image

The only question for @dwynwen is to clarify if the pipe labelled in light green is connected to anything.
We can't see that in the photos.

Possibly nowhere, just a diligent installer insulating a tail?  I think it might be intended for a direct-attach expansion vessel see here

UNVENTEDCOMPONENTSEUROPE.COM "https://www.unventedcomponentseurope.com/wp-content/uploads/2020/05/533112-CST-UV3-PRV-Monobloc-Manifold_DS_06-15.pdf"

 


This post was modified 7 months 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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 JamesPa
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10/02/2025 6:26 pm  

Posted by: @transparent
↑

Is it possible that the installer has used the 'wrong' cold supply pipe in @dwynwen 's  house?

Is that why he's seeing pressure differential when there shouldn't be any?

I posted a reply to the question about the pipe. 

re your question above, where is @dwynwen seeing a pressure differential, Im confused (or forgetful).


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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Transparent
 Transparent
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10/02/2025 6:32 pm  

There was an earlier post here where @dwynwen referred to high pressure in hot pipe and low pressure in the cold supply.

 

I have FOUR different cold supply systems in my house.

In my case I have the pipes colour-coded.

It's very easy to confuse them when installing stuff between several rooms.


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 JamesPa
(@jamespa)
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10/02/2025 6:33 pm  

@dwynwen just a reminder (as it was now a page of posts ago) to please post a picture of the handheld thermostat.


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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 Dwynwen
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10/02/2025 6:40 pm  

@jamespa Attached photos of green labelled pipe. Not as good as I hoped will send more if necessary.

Have turned pump on using thermostat. Very little noise in bedroom but distinct rumbling in kitchen below.

Thanks for all the help.

IMG 0962
IMG 0963
IMG 0964

 



   
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 Dwynwen
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10/02/2025 6:49 pm  

@jamespa Hand held thermostat:

IMG 0967


   
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