Energy use and water pumping

摘要

Energy use of pumps will vary depending on efficiency. The more efficient a pump, the less energy it will use to move a given volume of water. If you are thinking about installing a rainwater tank but are concerned that you will need to use energy to power a pump, think about this: the mains water in your home gets there by being pumped through the mains water system. This water is pumped great distances and is delivered to homes at a much higher pressure than generally needed. Because of these factors, the embodied energy in mains water is quite high, relatively speaking. Using a small pump to move water out of a rainwater tank will generally use far less energy than drawing that same volume of water from the mains.