The Glow-Worm Power System Filter 0010035820 is a brand new residential boiler filter designed for indoor use. It features a compact design, brass tank lining, and a water connection location on the side. With a power source of NG (Natural Gas) and a voltage of 220/240 V, this filter boasts an energy efficiency rating of A, making it a reliable and efficient choice for heating systems. Made in the United Kingdom, this Glow-Worm filter is a valuable addition to your central heating system.