(57) 57 The boiler is constituted by a combustion chamber (20;120) with oblique side walls.
(2, 4; 102, 104) adapted to cause the solid fuel to descend automatically by gravity
towards a lower grid (5,105) where combustion takes place.
The fuel is introduced through two capacious upper apertures (7,8; 107, 108) provided
with smokeproof covers.
The fluid to be fed to the heating bodies is heated in a central cylindrical body
(14, 114) with flue pipes. The central cylindrical body (14; 114) can be made either
in a version for feeding with solid fuel only or in a version for mixed feeding, in
which case the boiler is provided with appropriate supports for a conventional burner
(17).
The main advantage of the boiler is its great autonomy of feeding with solid fuel
which is introduced thereinto in considerable amounts - if desired, in the form of
large economical pieces of wood logs - which, however, are burned gradually in time.
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