A safe support assembly for the electric component parts of a burner has a supporting panel made of polymer material and to which the electric component parts are fixed, and a metal plate fixed to the supporting panel on the boiler side; in the supporting panel and the metal plate, are formed a first opening facing an inlet of an air intake conduit, and a second opening facing an air/fuel mixture outlet of a duct connected to the intake conduit. The support assembly also has spacer means interposed between the supporting panel and the metal plate, and defining a gap with the supporting panel and the metal plate. And a number of openings are formed in the spacer means to connect the intake conduit to the gap.