Whether you can place the tumble dryer on top of a washing machine depends on the dimensions and weight of the appliances. The WQB245B40 tumble dryer is 84.20 cm high, 59.80 cm wide and 61.30 cm deep, while the WGB244A40 washing machine is 84.5 cm high, 59.8 cm wide and 64.8 cm deep. Both appliances are roughly the same height, but the washing machine is slightly wider and deeper. It is important that the washing machine is stable enough to support the weight of the tumble dryer and that the dimensions fit to ensure that the tumble dryer can be placed safely on top of the washing machine. It is advisable to check the manufacturer's specific instructions or consult a professional to ensure that the combination is safe and stable.