Abstract: A radiator-convector comprising a plurality of modular elements which are assembled to one another and comprise each a pair of hollow and parallel sleeves. A plate extends in a perpendicular plane to the plane whereon said sleeve axes lie. The laminar rib is integral with the sleeves. Substantially parallel oblique fins extend from the opposed faces of the plate and obliquely with respect to the sleeve axes lying plane. The plate is further provided on its front edge with front fins which, when the modular elements are assembled, define a front wall and define, with the plate of adjacent elements, vertical channels whereto oblique channels open which are defined by the oblique fins.