Worcester Greenstar 4000 18 System Boiler

The Worcester Greenstar 4000 18kW condensing system boiler is a good choice for a medium to large-sized home when used with a heating system that includes a stored hot water cylinder. Compact and lightweight, it allows simple and versatile installation, while a wide range of optional controls offers added user comfort and economy. Compact, space-saving dimensions Built-in pump and expansion vessel Plug-in optional diverter valve Range of optional controls