The Worcester Bosch Greenstar Danesmoor External Regular Boiler Oil 18 mm x 25 mm has been enhanced to offer compliance with the efficiency requirements of the ErP directive policy, and actually exceeds the efficiency requirements. This is achieved with a smaller, much more efficient primary heat exchanger and an upgraded secondary heat exchanger. The Worcester Bosch Greenstar Danesmoor External Regular Boiler Oil 18 mm x 25 mm has been enhanced to offer compliance with the efficiency requirements of the ErP directive policy, and actually exceeds the efficiency requirements. This is achieved with a smaller, much more efficient primary heat exchanger and an upgraded secondary heat exchanger.