Using modern condensing boilers instead of traditional boilers can achieve annual savings of up to 30%, as well as being highly efficient. In conventional heating systems, the temperature of combustion gases is maintained at a high level so that the water vapor contained in the combustion gases does not condense in the boiler. It is exactly the opposite in condensing boilers. Combustion gases are deeply cooled, below so called dew point temperature for water vapor at which it starts to condense. The heat of condensation released by water vapor is recovered and transferred to the heating water.

Selecting a boiler with suitable power is a fundamental requirement for the comfortable heating of offices, as well as economic and ecological usage of the entire heating system. This is why Hoval has a number of devices on offer - boilers of medium and high power operating in low temperature mode. This means that the boiler can operate with variable heating water temperature, usually in weather control mode. Gas condensing boilers cooperate with solar collectors, ensuring minimal heating costs of the building - being used, for example, for the production of domestic hot water, or for the purposes of central heating.

Rising prices of solid fuels and electricity has led many investors to invest in renewable energy sources in the form of solar collectors. Growing environmental awareness in both micro and macro scale also determines the fact that besides economic reasons, there are environmental considerations that we take into account and that is why solar energy is successfully used not only in households, but in office buildings and public buildings, having a positive impact on the economic balance of the building's operation.

In office buildings the most common purpose for installing solar energy systems is to heat domestic hot water rather than heating, because the use of domestic hot water occurs throughout the entire year, and the largest amount of energy from the sun is obtained during summer. Selecting a large system with solar collectors is subject to different rules than the standard, small systems for single family houses, therefore Hoval, with its many years of experience based on identification of the investor's needs and characteristics of the building, allows the selection of the size of the solar energy system, along with the surface of the solar collectors and the volume of batch tanks.

The use of UltraSol flat-plate collectors seems reasonable from an economic point of view. As the system increases, so does the efficiency of its operation, as well as the economy of collected energy, therefore the use of solar collectors, especially in office buildings, brings tangible benefits.