Energy and water are very important commodities to human life. The world is

suffering from a critical shortage in water and energy; the researchers must work hard to

find sources of potable water and renewable energy. Energy and water saving

techniques has a great importance especially in this transmission period. In this paper

analyses were done for discrete water supply in hot water storage tanks, aiming to

reduce energy and water losses. The analyses were based on an experimental study for

the temperature distribution in the hot water storage tank for different flow rates and off

periods, 3, 6, and 9 lpm, and 5, 10, and 15 minutes were considered for flow rates and

off periods respectively. It has been found that increasing the hot water consumption

rate reduces the total delivered hot water to the consumer. The analyses indicated

increase in the usable hot water for small and medium off periods. This increase results

in water and energy saving for the consumer. Also optimum off periods for the different

flow rates were obtained after which the total usable hot water starts decreasing as

expected.

This optimum off period is valuable to save water and energy, and can be

integrated with the solar radiation in winter and summer to determine the new optimum

off periods for the different locations and time.