Maximum Boiler Pressure

Chris_J · 28 Dec 2009

I normally have my boiler pressure set to just slightly over 1 bar when stone cold.

However, today, the boiler had been running for some time and I noticed the pressure had risen to almost 2.5 bar.

Obviously, I would expect it to rise when it gets hot, but does this seem normal, or is there something starting to go wrong with the PV?

It hasn't tripped out yet, or blown the PRV.

theheatinghelper · 28 Dec 2009

the P.R.V (pressure relief valve) is there to do a job. to stop the pipes in you heating system going popif the water over heats. Its the weakest piont on the system so normally around 3/4 bar the prv will start to leak to out side, which says its doing its job, when water is heated it will naturally expand with pressure, i wouldnt worry to much unless it starts coming out of the pressure relief valve !

Chris_J · 28 Dec 2009

Ok cheers.

It just had me worried as it was in the red zone on the gauge.

Thanks for your help

landyandy · 28 Dec 2009

2.5 is a bit high.

If it is 1 bar at cold and 2.5 when heated then your expansion vessel might need pumping up.

Andy.

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Maximum Boiler Pressure

Chris_J

theheatinghelper

Chris_J

landyandy

DIYnot Local

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