Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Repiping Volumiser ...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

[Solved] Repiping Volumiser tank

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 5 months ago
2 Posts
2 Users
0 Reactions
512 Views
RSS
 DavidAlgarve
(@davidalgarve)
Reputable Member Member
Joined: 3 years ago
Posts: 248
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 5 months 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


   
Quote
Topic Tags
volumiser
JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 5456
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.


   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Related Topics
Topic Tags:  volumiser (4) ,
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Members Online

Click to access the login or register cheese
Protected By
Shield Security PRO