The Bosch Internal hot water heater is made for indoor use only and has been designed with ease of installation in mind. Compact in design, it is energy efficient and does not require a power point. This Bosch hot water system is an ideal replacement where an internal unit already exists, although the existing flue must go in a straight line without a bend (for safety reasons). These Bosch units come in either Natural or LP Gas and they are available in three different capacities (10,13 and 16 Litres/min flow rate). All units and components are totally eco-friendly and with advanced safety features to guarantee the whole family.