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Vaillant EcoTec Plus 831?

My girl-friend`s boiler keeps loosing pressure. What could be the cause of it? She says the boiler has to be switched on to get the appropriate pressure in the boiler so the hot water can flow in a shower.

Raph
March 2010
VaillantHeating, Home Heating SystemsVaillant Boiler Pressure

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Vaillant ecoTEC 831 Plus

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