The Bosch External HydroPower water heater is made specifically for outdoor use and is designed to make for an easy installation. It is both compact and energy efficient, and cheap to install, without the need for a power point. These Bosch external Hot Water Systems are an ideal replacement where there already exists an outdoor continuous flow unit. However, more and more people are using the Bosch hot Water tanks to replace their traditional storage tanks. They are available in both Natural or LP Gas, and are produced in three different models and sizes (10, 13 and 16 Litres/min flow rate). All units have electronic hydro-powered ignition, so that no electricity is required & no manual igniting necessary.