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Mend Test Boiler Pressure

How do i test the vessal on my system bolier?

Boiler keeps loseing pressure and think it might be the vessal,how can i test it and what should it read?

Alex
February 2012
With air pressure guadge ,one you use to test car tyre ,what make boiler refer to boiler manual ,most is 0.75

ltd
February 2012

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