The grant vortex pro external combi boiler delivers high-performance heating and hot water through an advanced external design engineered for installations where internal space is limited. The 26,000w output combines with oversized heat exchangers for superior hot water delivery. The high-quality powder-coated casing withstands all weather conditions while protecting grant's patented stainless steel heat exchanger technology. Space heating efficiency reaches 91.71%, Backed by 'a' energy rating for heating performance. Factory-fitted multi-directional flue reduces installation time, while built-in frost protection and neon diagnostic indicators ensure reliable operation. The system includes a 24-litre expansion vessel and offers biofuel compatibility depending on blend type and percentage. Features & benefits: high-performance external design ideal for properties requiring internal space conservation. Durable powder-coated weatherproof casing engineered for all outdoor conditions. Grant's patented stainless steel heat exchanger for long-term reliability. Space heating efficiency of 91.71% With 'a' energy rating for optimal performance. Factory-fitted multi-directional flue for simplified installation. Built-in frost protection and neon diagnostic indicators for dependable operation. Biofuel compatible subject to fuel type and blend percentage. Output: 26,000w 26kw . Dimensions d x h x w : 754 x 945 x 658mm. Includes: 24-litre expansion vessel.