Features aluminium-coated stainless steel heat exchanger, brass hydraulic block, easy-to-use controls, self-diagnostics, weather compensation, anti-seize function and frost protection. Max. Domestic Hot Water Output: 24.6kW Max. Central Heating Output: 20.6kW Stainless Steel Heat Exchanger Top Flue Outlet Compatible with Solar Panels 5 Year Manufacturer's Guarantee (T&Cs Apply) 81,000BTU LCD Display Brass Hydraulic Sections Max. Domestic Hot Water Output: 24.6kW Max. Central Heating Output: 20.6kW Stainless Steel Heat Exchanger Top Flue Outlet Compatible with Solar Panels 5 Year Manufacturer's Guarantee (T&Cs Apply) 81,000BTU LCD Display Brass Hydraulic Sections