The average home wastes over 11,461 gallons of water per year due to unnecessary wait for hot water to reach showers and faucets. The Grundfos UP 1542B7 Recirculator Pump for hot water saves money, saves water, and saves time with its HWR (hot water recirculation) technology. Never wait for hot water again. In typical plumbing, water is pumped from the water heater through the pipes to the tap. Once the water is turned off, the remaining water in the pipes cools and the wait for hot water occurs the next time the tap is turned on. The Series UP 59896146 pump attaches to the water heater through the hot water pipe and constantly circulates hot water through the pipe from the heater to the tap. They water in the pipe is always hot and no water is wasted.Features an open system, 17 GPM (gallons per minute), 1 speed, 1/25 Horse Power, Bronze 3/4" Sweat Housing, 115 Volts and 85 Watts. Never wait for hot water again. For use with circulation of hot or cold water in domestic hot water recirculation, cooling and air conditioning systems, heating systems with nonoxygen barrier tubing applications.