The Worcester 87186422110 3-way valve (SAIA, without bypass) is a genuine Worcester Bosch hydraulic control component engineered to manage the direction of heated water flow within compatible Worcester Bosch boilers and heating systems. Unlike a traditional 3-way valve with an integrated bypass, this version routes flow between central heating and domestic hot water circuits without a built-in bypass path, relying on the system’s design to handle return flow or bypass requirements externally. This valve plays a critical role in ensuring the correct distribution of heat based on demand, helping the boiler respond accurately to heating or hot water requests while supporting efficient system operation.

This 3-way valve is compatible with selected Worcester Bosch boilers and system configurations that specify part number 87186422110 for a SAIA-type diverter without bypass. Because valve configurations and hydraulic layouts vary by boiler model, series and production year, it’s recommended to confirm suitability using your boiler’s exact model number and GC number before ordering.

Key features of the Worcester 87186422110 3-way valve SAIA (without bypass) include genuine Worcester Bosch construction for assured quality and compatibility, precision hydraulic routing to direct water flow between heating circuits, robust engineering suited to routine thermal and pressure stresses, seamless integration into compatible boiler hydraulic systems when installed by a qualified heating engineer, and dependable performance that supports accurate heat distribution and system responsiveness.