The Greenstar Ri boiler range is available in 4 models with outputs up to 24kW, making it suitable for a wider range of households with stored hot water systems. The boilers are compact enough to be installed in a standard kitchen cabinet and are a one-man lift, weighing just 22.6kg, the lightest in their class. Greenstar Ri boilers can be used with compatible Worcester unvented cylinders for the optimum system solution. Features include a 10-year guarantee on the primary heat exchanger (subject to terms and conditions), compact dimensions for kitchen cupboard installation, built-in heating temperature control, compatibility with Greenskies solar panels, low NOx and CO2 emissions for environmental friendliness, multi-directional fluing for siting flexibility, and an A rated efficiency (SAP 2005 seasonal efficiency).