WaterQuick Pro II - Standard Tank Style Circulation System EASY one hour installation and is the first true on-demand hot water circulating system YOU GET 30% more water that delivers hot water in 30 seconds or less SMALL, high speed, and ultra-quiet hot water circulation pump WORKS with tank style water heaters and installs on top of the water heater ANY hot water faucet activates the pump hot water use is detected and turns the hot water pump on