Worcester Greenstar Heatslave II External 18/25 Combi Oil Boiler (2022+)

The Worcester Greenstar Heatslave II External 18/25 Combi Oil Boiler (2022+) is a high-efficiency, floor-standing condensing oil boiler designed for external installation in medium to large homes with one or two bathrooms.​

Key Features

• Heating Output: 25 kW

• Hot Water Flow Rate: 18 litres per minute

• Efficiency: Achieves an A rating for heating and B for hot water under the ErP scheme, with a seasonal efficiency of up to 90%

• Design: Compact external unit with dimensions of 950mm (H) x 640mm (W) x 770mm (D), designed for easy installation and servicing

• Burner Technology: Equipped with a cross-firing burner and a one-piece stainless steel primary baffle for quick and easy servicing

• Digital Control: Features the Heatronic 4i digital control unit, offering precise heating and hot water control

• Flue Options: Supports 80/125mm room-sealed flues with lengths up to 8m and plume management up to 5m