Abstract: Disclosed herein are a washing machine that detects the weight of laundry based on the displacement of a rotary tub and a control method thereof. The washing machine includes a rotary tub displaced according to the weight of laundry, at least one sensor module to detect the displacement of the rotary tub, and a controller to calculate the weight of the laundry according to the displacement of the rotary tub. The weight of the laundry is sensed according to the displacement of the rotary tub in which the laundry is directly placed.

Abstract: A washer has a structure to prevent overheating of a heater. The washer includes a tub to contain wash water, a rotating drum provided in the tub, a heater to heat water in the tub, and a circulation unit to supply water in the tub to the rotating drum. A circulation hole is formed at a height same as or greater than a mounting height of the heater to allow water to flow into the circulation unit. This prevents the height of water from becoming less than the mounting height of the heater even when the circulation unit is in operation, thereby preventing overheating of the heater.