(57) This invention relates to a wall-mounted gas boiler, particularly useful for domestic
employment, of the type comprising a pre-mix burner (13), a heat exchanger (12), a
circuit (8) for allowing the combustion air to circulate, means (5) for causing said
air to circulate, a chamber (18) for mixing air with the gas, in which chamber an
opening (19) is provided, upstream of said mixing chamber (18) in the circuit (8)
for the circulation of air, said opening being closed by valve means (20) and allowing
the dilution air to flow towards the openings (21) without becoming mixed with the
gas at the point corresponding to the mixing chamber (18), means (22, 23 and 24) being
provided for changing the amount of gas introduced in proportion to the flowrate of
the air flowing through the same.
The boiler according to this invention can also be provided with a single-piece container
(2) having a pressurized inner chamber (9), inside which both the burner (13) and
the heat exchanger (12) are arranged, and an outer depressurized chamber (8) through
which the air sucked in by the fan (5) flows, the outflow of smokes from the inner
chamber (9) and the inflow of air into the outer chamber (8) occurring through an
upper coaxial pipe (14); a closure member (3) of the container, said member being
provided with a double seal for closing both the inner chamber (9) and the outer chamber
(8) tightly; and a lower Archimedean screw (4) inside which the fan (5) is housed.
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