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Płyta grzewcza gazowa z wierzchnią płytą ceramiczną posiada pole dogrzewcze nad przedłużonymi kanałami spalinowym dwu palników gazowych (3) oraz posiada nadmuch powietrza przez kominek (9) w płycie nośnej (2) w celu umożliwienia regulacji temperatury pola dogrzewczego.The gas heating plate with a ceramic top plate has a reheating field over the extended flue gas ducts of two gas burners (3) and has an air blow through the fireplace (9) in the support plate (2) to allow adjustment of the reheat field temperature.
Preheating device for air by combustion of a boiler, comprises first and second structures of the heat exchanger, located in a combustion gas duct, with their respective inlets to supply primary air and secondary air to be heated, said inlets are located in the same level, perpendicular to the central line of the combustion gas duct; and power plant.