Provides both heating and hot water without the need for an additional hot water cylinder. Features Riello Low NOx burner technology. Increases hot water performance due to its low water content and larger surface area. Electric temperature controls allow the boiler to operate in condensing mode on central heating whilst maintaining instant water production. Max. Domestic Hot Water Output: 21kW Max. Central Heating Output: 21kW Stainless Steel Heat Exchanger Side or Rear Flue Outlet Compatible with Solar Panels 2 Year Manufacturers Guarantee (Registration Required, T&Cs Apply) 70,000BTU Easy to Read LED Indicators External Powder-Coated Casing & Built-in Frost Protection Max. Domestic Hot Water Output: 21kW Max. Central Heating Output: 21kW Stainless Steel Heat Exchanger Side or Rear Flue Outlet Compatible with Solar Panels 2 Year Manufacturers Guarantee (Registration Required, T&Cs Apply) 70,000BTU Easy to Read LED Indicators External Powder-Coated Casing & Built-in Frost Protection