SAVE WATER! At ONLY $179.95, the eco friendly Hot Water Lobster Instant Hot Water Valve provides faster hot water which saves water, saves energy and saves time. How long does it take for hot water to get to your faucet or shower? A lot of precious water is wasted down the drain while waiting for hot water. Even worse is the cost to heat the cold replacement water, which enters your house at the cold ground temperature. When the water in your hot water pipes cools below the user adjustable temperature, the Hot Water Lobster control valve automatically allows the thermal convection gererated by your existing hot water tank to naturally circulate the cooled water through your existing cold water pipes back to your water heater for reheating (without water waste).