Greenstar 12i system / 24i system is a wall-hung gas-fired condensing system boiler for sealed central heating systems and indirect fed domestic hot water
The guide provides safety precautions, installation clearances, control operation and maintenance advice for the Worcester Bosch Greenstar 12i/24i wall‑hung gas‑fired condensing boiler. It is intended for use with natural gas or LPG and must be installed by a competent person in the UK.
Key sections cover how to switch the boiler on and off, set temperature, control central heating, perform fault resetting, and understand the two‑year guarantee and registration process.