(57) An enclosed fireplace unit, particularly for heating buildings and sanitary water,
constituted by a hearth (3) on the perimeter whereof side walls (4,5a,5b,6a,6b) protrude
upwardly so as to delimit a firebox; a hood (19) for connection to a flue is arranged
above the firebox. At least one of the side walls of the enclosed fireplace unit is
constituted by a first labyrinth-like element (9) which is suitable for the passage
of water that arrives from one or more intake ducts (10a,10b) and is connected, in
an upward region, to a plurality of hollow plates (15) which can be accommodated in
the hood. The hollow plates have a refractory element at the rear and are connected,
in an upward region, to a second labyrinth-like element (21) for connection to one
or more discharge ducts (23a,23b).
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