Mixing unit and mixer tap including such a mixing unit

A mixing unit for a mixer tap, which comprises:

• a first inlet for a first incoming stream of fluid having a first temperature,
• a second inlet for a second incoming stream of fluid having a second temperature higher than the first temperature,
• a mixer for mixing the first and second incoming streams to form an output stream,
• an outlet for the output stream,
• a thermostat comprising:
• a heat-sensitive part arranged at least partially in the outlet, and a moving part translatable relative to the heat-sensitive part along a first axis,
• a seal of the second inlet connected to the moving part in translation along the first axis, and
• a housing, configured to place the outlet in communication with the second inlet along the first axis, and wherein the heat sensitive part and the moving part are housed so as to tightly seal the communication between the outlet and the second inlet,
• the outlet comprises a stop designed to retain the heat-sensitive part in translation along the first axis, in a direction parallel to the first axis and opposite the seal, the stop limiting the travel space of the heat sensitive part and the moving part are outside the housing to thus avoid a break in the tightness of the housing,
• wherein the mixing unit comprises a fastener via which the heat-sensitive part is secured to the housing, the heat-sensitive part being placed at a play distance from the stop, and being provided with a peripheral sealing gasket guaranteeing the tightness of the seal of the housing by the heat-sensitive part, the sealing gasket being in annular contact with the wall of the housing over a distance, measured parallel to the first axis, which is greater than the play distance.