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Mend Vaillant 120 Boiler Heating Pressure

Valliant boiler time switch 120 low preasure?

I have the above boiler that keeps loosing preasure. How can I increase the preasure myself? Where is the main water intake? If possible a picture or diagram would be helpful.

Many thanks

helen
January 2009
VaillantVaillant 120Heating, Home Heating SystemsBoiler Heating Pressure

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