(57) A radiator (1a), particularly for heating systems or the like, with high thermal
performance and very quiet operation, comprising a radiator body (2a) in which there
is a chamber (3a) which is separated hermetically from the outside environment, the
chamber (3 a) being filled partially with a liquid (4a) which gathers on the bottom
of the chamber and being in partial vacuum at ambient temperature, the radiator (1a)
being provided with means (5a) for heating the liquid (4a) which are separated with
a liquid-tight seal from the liquid by a heat exchange surface (6a), the heat exchange
surface (6a) emerging at least partially from the free surface of the liquid (4a)
contained in the chamber (3a), a capillary structure (7a) being provided which lies
at least between the free surface of the liquid (4a) and the heat exchange surface
(6a) and being adapted to convey the liquid (4a) onto the heat exchange surface (6a).
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