This Worcester Greenstar Mini System Filter is an essential component for any storage tank water heater. Designed with a 22mm diameter, it is compatible with a range of heater types and brands including Worcester. Its features include a compact and efficient design, making it ideal for small spaces and easy installation. The filter is perfect for removing debris and sludge from the tank, improving the overall performance and longevity of your heating system. It is suitable for use in standard water heaters and is a must-have for anyone looking to maintain the efficiency of their heating system.