A steam generator (200) comprising: an enclosure heater (210) downdraft formed by walls (216) made of cooled steam or water tubes, and wherein the walls of the heater define an upper end (212 ) and a bottom gas outlet; an enclosure of convection pass (230) including a lower gas inlet and banks of horizontal tubes located above the lower gas inlet; one Cuba hopper (270) connecting the bottom gas outlet of the enclosure heater downstream the inlet lower gas enclosure convection pass, including Cuba hopper at least one conveyor submerged chain (274) to removing ash and debris from the enclosure downstream heater and the convection pass enclosure; an output terminal of steam at the base of the steam generator; and windbox (218) and burners (220) at the upper end of the enclosure downstream heater to generate exhaust gas.
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