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

 
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Air Source Heat Pumps (ASHPs)
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 Brendon Uys
(@heacol)
Noble Member Contributor
Joined: 4 years ago
Posts: 415
21/09/2025 7:25 pm  

Posted by: @grantmethestrength
↑

The pumps on the Grants are beasts mine is on the lowest setting and still shoving 28 L/min through the system on full whack it was shifting over 40 L/min!

It may be pushing 40l/min, but where is that water going, maybe through the first 2 radiators and very little to the rest?

 


Director at Heacol | Expert Heat Pump Consultant | Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.


   
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 Brendon Uys
(@heacol)
Noble Member Contributor
Joined: 4 years ago
Posts: 415
21/09/2025 7:31 pm  

@adamk Where is your pump connected to? What pump valves are on the pump? What diverter valve are you using? Vibration in pipes usually comes from valves and the turbulence they cause, not from water flowing through the pipes contrary to popular belief. In Mars's system, the original  primary pipework in to the building has a velocity of nearly 1.9 m/sec, and it is silent.

 

I did not re-pipe the system, just the plant room, all the original pipework is still being utilised. 


This post was modified 54 minutes ago by Brendon Uys

Director at Heacol | Expert Heat Pump Consultant | Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.


   
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 Grantmethestrength
(@grantmethestrength)
Reputable Member Member
Joined: 8 months ago
Posts: 102
21/09/2025 7:48 pm  

Posted by: @heacol
↑

Posted by: @grantmethestrength
↑

The pumps on the Grants are beasts mine is on the lowest setting and still shoving 28 L/min through the system on full whack it was shifting over 40 L/min!

It may be pushing 40l/min, but where is that water going, maybe through the first 2 radiators and very little to the rest?

 

That was one of the issues we were having, the installer kept banging on that the flow rate was really impressive and that we should be amazed by his amazing install! Needless to say we turned it down to the lowest setting and we now actually get a pretty “balanced” heat throughout the house. I need to bite the bullet and get the FRVs and while they are being fitted move the two incorrectly placed rads and finally sort out the last of the leaks in the system while it is drained down! All before it gets cold, when the wife is out so I don’t get in trouble for tinkering again!

 

 

 


Kind Regards
Si
——————————————————————————
Grant Aerona3 13kW
13 x 435w + 13x 480w Solar Panels
Sigenergy 10kW Inverter
16kW Sigenstor battery


   
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 Brendon Uys
(@heacol)
Noble Member Contributor
Joined: 4 years ago
Posts: 415
21/09/2025 8:06 pm  

@grantmethestrength I am sorry you have not had an optimal service. The FRV valves MUST be installed on the return of the radiators, we had a problem at Mars's because the lockshields were installed both on the flow and returns, so it was not a simple swop out. It is a good idea, when the heat pump is running to identify the flows and returns of the radiators, prior to drain-down, it will eliminate a lot of problems later.


Director at Heacol | Expert Heat Pump Consultant | Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.


   
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 Grantmethestrength
(@grantmethestrength)
Reputable Member Member
Joined: 8 months ago
Posts: 102
21/09/2025 8:12 pm  

Posted by: @heacol
↑

@grantmethestrength I am sorry you have not had an optimal service. The FRV valves MUST be installed on the return of the radiators, we had a problem at Mars's because the lockshields were installed both on the flow and returns, so it was not a simple swop out. It is a good idea, when the heat pump is running to identify the flows and returns of the radiators, prior to drain-down, it will eliminate a lot of problems later.

Thanks for the advice Brandon, when I tried (and dramatically failed) to balance the rads last winter I noticed that on some rads the TRVs were on the “wrong”side, but as I am a rank amateur I failed to make a note of which ones so will have to measure them again. Oh well you lives and learns!

 


Kind Regards
Si
——————————————————————————
Grant Aerona3 13kW
13 x 435w + 13x 480w Solar Panels
Sigenergy 10kW Inverter
16kW Sigenstor battery


   
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