The Greenstar Ri 27 & 30 kW boilers are compact, wall-mounted boilers that are ideal for small and medium-sized homes with stored hot water systems. Small enough to be installed in a standard kitchen cupboard, this boiler can be used with our range of high efficiency Greenstore cylinders for a complete Worcester system solution for your home. They feature the Heatronic 4i control box which, for the first time enables an optional Worcester plug-in control to be used with a regular boiler, when a Greenstar Wiring Centre is also installed for added energy savings.