Vaillant Exclusive 838 Combi boiler provides high pressure, hot water performance and optimum levels of central heating in larger property thanks to hot water flowrate of 15.2 litres per minute and an ability to reach central heating outputs of up to 38kW. Suitable for 2 or 4 bedroom properties, with 1 or 2 bathrooms. It doesnot require an external hot water tank and cold water cistern which saves space and makes maintainance easy. It provides instant hot water. The new ERP version offers premium performance and fuel efficiency whilst creating a solid basis for the heating system of larger homes. It features electronically controlled low energy pump that helps to reduce energy consumption. Highly efficient and economical to run with up to an 88.8% efficiency rating (SAP 2009)