The Complete Wiring Loom for Worcester Greenstar 28i Junior Condensing Combi Boiler is a high-quality product designed specifically for residential use. Made by Worcester in the United Kingdom, this boiler operates on NG (Natural Gas) and has.energy efficiency rating of A, this boiler is not only efficient but also compatible 1 for smart home control. The wiring loom ensures all components are connected and functioning properly, making it a reliable choice for heating and hot water systems.