Appliances that blow warm air to heat up the air in a confined place have long been used in industrial heating technology.

For old traditional systems with central boiler rooms, the most widespread solution was the steam- or hot water-operated thermoventilator heating. Great disadvantages of these systems were the substantial pipeline loss and the very high maintenance costs due to corrosive processes. Even so, it can be a practical solution for smaller or basically hot water heating systems where boilers are used for convective heating or the production of sanitary hot water.
In the case of larger areas, it is obvious that decentralized hot air heating systems have to be developed if radiant heating cannot be applied du to the given technology or geometric dimensions.

Basically, gas-operated air heaters have two different versions: wall- or ceiling-mounted appliances and standing solution appliances. Both of them can be applied independently or connected to air duct systems.
In response to the users’ requirements, a new generation of air heaters has appeared in the market that has a summer operational mode as well, during which air – including air from outdoor – is circulated to ensure ventilation or cooling panels are mounted on the air supply side. Through this method, the internal temperature of premises can be kept at the desired value both in winter and summer.