Can include roof flue with 45 bends and extension for additional £120. Fully working. No flue otherwise. The Worcester Bosch Greenstar 12RI Boiler is a high-quality storage tank water heater designed by the trusted brand Worcester. This efficient boiler is perfect for heating water in your home, making it a reliable choice for keeping your home warm and comfortable. With its innovative technology and sleek design, the Worcester Bosch Greenstar 12RI Boiler is a great addition to any heating system in the UK.