Patent ID: 7743632

Claim:
A drum washing machine comprising: a water supply unit connected to an outside water source; a tub to hold water, the tub being in fluid communication with the water supply unit to receive the water; a drum rotatably mounted in the tub; at least one steam supply unit provided with an inlet which is connected only to a water supply line connected to the water supply unit to receive water from only the outside water source, a heater to heat the water to produce steam, and an outlet to discharge steam into the tub, the at least one steam supply unit configured to supply the steam at an upper portion of the tub during an operation for treating laundry inside the drum; and at least one circulation pump to circulate the water inside the tub, the at least one circulation pump is connected to a first water line to draw out the water inside the tub therethrough and a second water line to supply the drawn water into the tub therethrough.