This unit has a marine grade motor housing, a stainless steel pump body and a sealed on-off electrical switch. This makes it weather resistant and suitable for outdoor use, for clean tank water only (not water from ponds, lakes, rivers and etc.) Able to pump 3,700 litres per hour or 61 litres per minute, this pump is designed for pumping clean tank water which is connected to a system where the water flow is controlled with a tap. Some 2300 watt power draining monsters not only pump up plenty of water, but they also pump up your electricity bill! At 1200 watts, this pump is much cheaper to run and will still pump plenty of tank water for garden irrigation needs.