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Vaillant water pressure gauge vs Analogue gauge

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 9 hours ago
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 jeegnesh
(@jeegnesh)
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Topic starter 19/03/2025 3:19 pm  

So this has been the story since install but via the controller the water pressure always shows lower than the analogue gauge at the filler loop, Example ASHP is saying 1.4 bar, the analogue gauge is saying 2.2 bar

How do I know which is correct?

13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car


   
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 JamesPa
(@jamespa)
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19/03/2025 4:55 pm  

I have the same, so equally interested in the answer. 

I think its possible that both are correct depending on where they are located in the circuit.  For example a pressure gauge immediately after the water pump will read more than a pressure gauge just before the water pump, the difference being the head required to drive the water through the system

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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