Hot Water Tank Mixing Valve

mixing valve
A Thermostatic Mixing Valve (TMV) is a valve that blends hot water (stored at temperatures high enough to kill bacteria) with cold water to ensure constant, safe outlet temperatures preventing scalding.
A valve that mixes hot and cold water in the valve to obtain a set temperature prior to delivery.
A valve operated by a thermostat that can be installed in solar water heating systems to mix cold water with water from the collector loop to maintain a safe water temperature.

water tank
A tank supplying water for water-based fire protection systems.
cistern: a tank that holds the water used to flush a toilet
Water tanks are liquid storage containers, these tanks are usually storing water for human consumption. The need for water tank systems is as old as civilized man.

hot
Having a high degree of heat or a high temperature
(of food or drink) Prepared by heating and served without cooling
used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning; "hot stove"; "hot water"; "a hot August day"; "a hot stuffy room"; "she's hot and tired"; "a hot forehead"
characterized by violent and forceful activity or movement; very intense; "the fighting became hot and heavy"; "a hot engagement"; "a raging battle"; "the river became a raging torrent"
extended meanings; especially of psychological heat; marked by intensity or vehemence especially of passion or enthusiasm; "a hot temper"; "a hot topic"; "a hot new book"; "a hot love affair"; "a hot argument"
Feeling or producing an uncomfortable sensation of heat