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Mend Vaillant combi boiler Boiler Radiators Pressure

How do I increase water pressure on my Valliant combi bolier?

I have removed two radiators, replaced them both, but the heat is staying in the lower part of the radiators. I have tried bleeding them but only a small amount of air comes out.The model is a vailliant combi boiler. The water pressure seems low but am unsure which valve is the one to increase the pressure.

Mike
December 2005
VaillantVaillant combi boilerHeating, Home Heating SystemsBoiler Radiators Pressure
You need to top up the system via the filling loop usually located at the bottom of the boiler. Open the two "washing machine" type valves on the hose until the boiler reaches a pressure of 2 bar. When it reaches this pressure, turn the valves off.

Joe O'Connell
December 2005

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Find out how to mend Vaillant combi boiler home heating systems