Drum type washing machine and corresponding method of operating

A drum type washing machine, where steam and hot water are supplied to heat wash water, including: a water tub (11) for containing wash water; a rotating drum (14) rotatably mounted in the water tub (11) and having, at a peripheral wall thereof, a plurality of through holes; (12b) a heating tank (31) for heating water and generating steam; a water supply unit (20) for supplying water into the water tub (11) and the heating tank (31); and a steam supply pipe (51), adapted to guide the steam from the heating tank (31) to the water tub (11), connected to the water tub (11). In this drum type washing machine, the temperature of wash water can be rapidly increased in accordance with steam and hot water supplied into the water tub (11). Accordingly, it is possible to reduce the overall wash time while reducing the amount of wash water to be used.