Water heating is a thermodynamic process that uses an energy source to heat water above its initial temperature. Typical domestic uses of hot water include cooking, cleaning, bathing, and space heating.In industry, hot water and water heated to steam have many uses. common arrangement where hot-water space heating is employed, is for a boiler to also heat potable water, providing a continuous supply of DHW without extra equipment. Appliances that can supply both space-heating and DHW are called combination (or combi) boilers.
1 The population of South Africa is estimated at 53,139,528 as of July 1 2014. 2  South Africa's population is equivalent to 0.73% of the total world population. 3  South Africa ranks number 25 in the list of countries by population.
Ethiopia is located in the Horn of Africa and has a total area of about 1.1 million square kilometers. With a population of more than 75 million, it is one of the most populous countries in sub-Saharan Africa; more than 85% of the people live in rural areas. Population density averages 52.2 per square km. with great variation among regions. The annual total population growth rate is 2.9% and 4.1% in urban areas. The country is one of the least developed countries in the world with an estimated per capita income of USD 130.