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It is a replacement part for the Worcester Greenstar 30i System boiler. It is required to use heating controls with this boiler, and it is also compatible with Y or S plan systems provided the optional diverter valve kit is fitted.
‚¦‚ Essential for using heating controls with the Worcester Greenstar 30i System boiler.
‚¦‚Easy to install.
‚¦‚ Compatible with Y or S plan systems.