On average a system with 6 to 8 m2 of solar panels (collectors) and a heat accumulator (thermal reservoir) of 200 to 300 litres is sufficient for a four-member family. A correctly designed and professionally installed system can provide at least 70% of the hot water needs of such a household.

• Solar energy receivers (collectors): These convert solar radiation into heat which is then transferred it to the circulating liquid medium that carries the heat to where it is needed or to the heat accumulator where it is stored.
  
  
• Heat accumulator (heat reservoir): Collects and stores thermal energy obtained from natural sources, such as solar radiation. The shell of the accumulator is made of hard polyurethane which provides a high degree of thermal insulation. The size of the accumulator depends on the requirements for hot water as well as the type and intensity of the energy source.
  
  
• Teramatik D3 control unit: With its temperature sensors this unit assures the efficient and safe automatic operation of the solar system through regulating water temperature in the heat accumulator and in other components of the system. The timer program, desired room temperature, outside temperature as well as an array of other data influence the exact operation of the heating system. The modern Teramatik D3 controller assesses all the aforementioned data and provides optimal regulation of the entire central heating system as well as the heating of sanitary water.