The most common application of Solar Heating are systems designed to heat the domestic hot water. An innermost constituent of such system it the hot planetary water tank, used to store the solar thermal energy. An Heat Exchanger tranfers the heat produced in the Collector to the potable water in the well-insulated it cantank, where  be hold for hours or sometimes days until it's consumed for example providing a bath or shower. Usual distinctiveness of a solar hot water tank compared to conventional boilers or hot water tanks are:
1. Intended for an domestic of a particular size the volumen -- and so the storage capability -- of a solar storage tank is considerably high.
2. The structural shape of a solar tank has to be tall and slim, so supporting the thermal stratification in the tank: the solar heat exchanger at the bottom of the tank is working on cold water; the heated water arises in the tank. So that the hottest water is used first, the pipe enters the heater at the top of the tank.
3. Insulating prevents heat loss and thus helps store heat for days, not merely hours.
4. There is a heat exchanging unit in the bottom of the tank that transfers the solar heat to the tank. There is an additional heat exchanging unit in the upper part of the tank that can receive heat from another source if the water in this area of the tank goes below a specified temperature setting. This means there is always hot water.
Normally a solar hot water tank will be dimensioned to about the twice dimension of the probable amount of expenditure per day. Concerning this, the tank for a household with 4 persons and an standard utilization of 40 liters hot water per head and day ought to hold about 300 to 320 liters. Since larger households need more water to stay clean and healthy, as well as a varying demand, the Solar Combisystems unit is better for these users.
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