5 Year Warranty. Available in black and white for combi and system boilers. Silver flues are also available. Full colour text and an intuitive menu display provides complete control and visibility of the system. Industry first RF Key links the boiler with our wireless Bosch Easy Control. Steel reinforced front cover can be removed with one screw for quick and easy internal access. Unique Greenstar Intelligent Filling System can eliminate the need for your customer to manually refill the boiler.