Abstract: A hot water storage tank having features to minimize heat loss and improve stratification throughout the tank. The tank having an inner lid and outer lid. The tank having a bladder. A tank having a solar stratification input pipe, the solar stratification input pipe having one or more holes, the one or more holes allowing the fluid to exit the solar stratification input pipe at a level where the fluid is of similar density to the fluid in the tank maintaining stratification throughout the tank, and the solar stratification input pipe being located within the tank and parallel to the longitudinal axis of the tank.

Abstract: A system and valve for regulating the level of a fluid. The valve having a floating head member that is connected via a rotatable member to a drain member, where fluid may drain from the valve. The system having the valve and a tank, where the fluid drains from the tank once the fluid level reaches the level of the drain member of the valve.