The Worcester Bosch Greenstar 12i 15i 18i 24i 28i Junior PCB 8748300921 is a crucial component for storage tank water heaters in the Worcester brand. This printed circuit board (PCB) is specifically designed for these models, ensuring efficient and reliable performance. Perfect for heating systems in homes, this product is a vital part of the heater's control mechanism, making it essential for maintaining a consistent and comfortable temperature in the living space. With the trusted Worcester brand behind it, this PCB is a trusted choice for keeping water heaters running smoothly.