To reduce the heat loss of the whole system by freeing a duct hose connecting a heat source device to a nozzle of heat radiation therefrom at all in a hot-air dryer on a water jet type loom.

This nozzle containing a heater therein on a water jet type nozzle is obtained by providing a nozzle of a double structure comprising an outer pipe 6a and an inner pipe 6b, installing the electric heater 7 in the inner pipe 6a and eliminating the need for the flow of high-temperature air in the interior of the duct hose 9.