The CONDENSING WARM AIR HEATER ENERGY-O provides controlled heating of the air to be supplied to residential, commercial and industrial premises. The equipment consist mainly of an isolated cabinet receiving the air flow produced by the ventilator group. The cabinet contains a high-efficiency INOX stainless steel heat exchanger which transfers the thermal power by means of direct exchange between combustion products and the air flow to be treated. Such air is heated when passing onto the exchanger’s hot surface and it is then distributed to the premises. The centrifugal fan’s characteristics make the equipment suitable to be installed where air is to be distributed through pipings or – more generally – where high static pressure is requied. During summertime, this equipment can also perform room ventilation only. The direct exchange technology employed by this equipment requires lower installation costs but first and foremost it allows a tangible reduction of operating costs.