Worcester GREENSTAR 12I FSN NG

and Worcester GREENSTAR 12I FSP LPG

with Worcester GREENSTAR 12RI FON NG

plus Worcester GREENSTAR 12RI FSP LPG

also Worcester GREENSTAR 15RI FON NG

fits Worcester GREENSTAR 15RI FSP LPG

and Worcester GREENSTAR 18RI FON NG

with Worcester GREENSTAR 18RI FSP LPG

plus Worcester GREENSTAR 24I FSN NG

also Worcester GREENSTAR 24I FSP LPG

fits Worcester GREENSTAR 24I JUNIOR

and Worcester GREENSTAR 24I JUNIOR

with Worcester GREENSTAR 24RI FON NG

plus Worcester GREENSTAR 24RI FSP LPG

also Worcester GREENSTAR 25SI FSN NG

fits Worcester GREENSTAR 25SI FSP LPG

and Worcester GREENSTAR 28I JUNIOR

with Worcester GREENSTAR 28I JUNIOR

plus Worcester GREENSTAR 30SI FSN NG

Worcester GREENSTAR 30SI FSP LPG

This part is based around the diverter valve section.

The diverter valve is a mechanism that only appears in combi boilers.

It allows the hot water to be sent to the heating system (radiators, etc.) or to the DHW system (taps, etc.). This feature is what separates a normal boiler from a combi boiler due to the fact the boiler can provide hot water and heating without the need for a cylinder.