A pressure-thermostat (1) includes a body (2) having a cavity (5), a conduit (6) for a fluid and at least a couple of electric switches (8a, 8b) arranged from the opposite part with respect to said conduit (6). An elastic membrane (9) separates, in a fluid-tight manner, the conduit (6) relative to the cavity (5) and is deformable for bending towards this latter. The pressure-thermostat (1) includes a thermostat (12) having a first electric switch (13) activable owing to a thermal deformation of a disk with a diameter higher or equal to 15 mm, arranged in correspondence with the bottom. The thermostat (12) is movable under the action of the elastic membrane (9) away or approaching with respect to the conduit (6). The pressure-thermostat (1) also includes transmission means (34) interposed between the elastic membrane (9) and the thermostat (12) for displacing this latter under the action of the elastic membrane (9). Transmission means (34) exchange heat with the elastic membrane (9) and the thermostat (12) and have a minimum cross section higher than 8 mm2.