Constructive disposition applied in termocontrolador for water, comprising a container (1) consisting of two parts (2 and 3 which can be threaded / desroscadas among themselves.Containing a sealing ring (6) between these two parts.And one of the parties contains the neck (7) for attaching the termocontrolador and the other part has a socket to receive an electrical resistance (10).Which is embedded inside the container and is responsible for the water heater until the temperature is determined.