A thermostatic valve includes a housing having a fluid inlet, a first outlet and a second outlet, a flap that is movable between a closed position, in which the flap closes the first outlet, and an open position, in which the flap opens the first outlet. The valve also includes a thermostatic actuator with an actuating rod connected to the flap and a capsule containing a thermally expanding material, and a heating element. The capsule has an internal portion, which extends inside the housing so as to be immersed in the fluid flowing between the inlet and the second outlet of the housing, and an external portion, which extends outside the housing. The heating element is arranged outside the housing and outside the capsule in order to heat the external portion.