VAILLANT 252457 DIVERTER VALVE. Product Information: The diverter valve is a part that only appears in combi boilers. It allows the hot water to be sent to the central heating system (radiators, etc.) or to the hot water system (taps, etc.). This feature is what seperates a normal boiler from a combi boiler due to the fact that a combi boiler wouldn't require a cylinder to provide heating and hot water. This part is present in 49 different boilers in the Vaillant range including the Vaillant TURBOmax PRO (2001-2002), TURBOmax PLUS (2000-2001), TURBOmax PLUS (2001-2002), ecoTEC exclusive 832 , TURBOmax PRO (2000-2001).
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