The evaporator (23) of a heat recovery circuit (24) associated with a cooling circuit (14) of a combustion engine (13) is arranged on a bypass (18) of an outlet pipe (16) outside the engine, and a valve (17) controls the distribution of the heat transfer streams between the bypass (18) and the portion parallel to the pipe (16). The flow passes fully or mainly via the bypass (18) when the motor is hot, but not when it is cold, so as to thus render the evaporator (23) inactive and so as not to prevent a normal rise in the temperature of the engine (13). By placing the evaporator (23) just at the outlet of the engine (13), a maximum flow of the heat transfer fluid passing through the cooling circuit (14) is obtained and therefore a more efficient heat recovery.
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