a water saver system that includes a temperature and touch sensitive valve , connected between the shower water control valves and the shower head , that diverts water to an accumulator tank until the water warms up . the temperature sensitive valve opens when the water reaches a preset temperature . the water stored in the accumulator tank flows back through a metering orifice and mixes with the warm water over the course of the shower so little water is wasted . the accumulator tank could be placed on the floor of the shower or outside the tub in a retrofit or built into the wall stud cavity in new construction .