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[Solved] Repiping Volumiser tank

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 month ago
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 DavidAlgarve
(@davidalgarve)
Reputable Member Member
Joined: 2 years ago
Posts: 244
Topic starter 15/04/2026 6:05 pm   [#2952]

I intend to replace the Plex pipework in the area of my volumiser tank.

I now realise that the contractor who changed it from buffer to return line volumiser, used too many Plex elbows with the result that potential flow was significantly limited.

I will take the opportunity of putting the tank in the flow, but have 2 options for piping as the diagram.

Volumiser Pipework Alternatives

Option 1 gives diagonal flow across the tank but will require more elbows/ bends.

Option 2 is the easiest and minimises elbows/ bends, but has inlet and outlet on the same side of the tank.

I would welcome views on which is the better option.


This topic was modified 1 month ago 2 times by Mars

342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 12kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4917
16/04/2026 7:56 am  

Without a detailed analysis of the hydrodynamics I would say it's impossible to say but unlikely to make a great deal of difference.  I can't see much chance that the tank somehow divides itself into two on a vertical plane in 1 so I would expect that most of the eater will be engaged.  It's gut feel I admit with a tiny bit of handwaving science.


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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