Boiler burning liquid or gaseous fuel, contains second heat exchanger and smoke gas collection chamber connected to hot gas channels around burner chamber

摘要

The burner casing (6) containing the water inlet (7) is hydraulically connected to the coiled tube (2) acting as a heat exchanger (3) and provided with the water outlet (9). Hot gas channels (11) arranged radially around the outside of the burner chamber (1) are in communication with a smoke gas collection chamber (12). Spacer elements between the coil turns (4) define a helical flow gap (5) for the gas to pass through.