Abstract: Provided is a duct docking device for a ventilation seat of a vehicle. The duct docking device enables air to be easily blown to a seatback and a seat cushion with a passenger in a seat using only one blower by enabling a seatback duct mounted at the seatback and a seat cushion duct mounted at the seat cushion to be hermetically docked through a connector duct, etc. at an unfolded position of the seatback in which a passenger can sit, and by enabling the seatback duct mounted at the seatback and the seat cushion duct mounted at the seat cushion to be separated from each other at a folded position of the seatback in consideration of that there is no passenger in the seat.

Abstract: A structure of a hot water pipe inserted with a heating wire installed in the floor of a room for heating. The structure of a hot water pipe inserted with a heating wire is provided with a low water level sensor for sensing the level of the heating water filling the inside of the hot water pipe. The structure is configured to prevent the pipe from being overheated or to malfunction by a lack of hot water. The low water level sensor is configured to stably operate so as to reduce the failing rate thereof, thus facilitating maintenance control. A low water level sensor provided in an auxiliary tank or one side of a hot water pipe senses the level of the hot water to prevent an accident caused by a lack of hot water. The low water level sensor operates using A/C current inputted through a control unit to a thermostat.