The Worcester Bosch Greenstar Ri boiler is a compact, wall-mounted unit ideal for small to medium homes, and a perfect replacement for existing systems. It's small enough to fit in a standard kitchen cupboard. This boiler range offers models with outputs up to 24kW, catering to a wider variety of households with stored hot water systems. Weighing only 22.6kg, it's the lightest in its class and designed for a one-man lift. It can be paired with compatible Worcester unvented cylinders for an optimal system solution. The boiler features a 10-year guarantee on the primary heat exchanger (subject to terms), built-in heating temperature control, compatibility with Greenskies solar panels, low NOx and CO2 emissions, multi-directional fluing for flexible siting, and an A-rated efficiency (SAP 2005 seasonal efficiency). Additional benefits include frost protection for installations in garages or lofts, and suitability for homes with hot water storage cylinders. It is also capable of running on a 20% hydrogen blend, ensuring future gas compatibility.