Our LW41 helped us for 22 years without any problems, the dry air in our townhouse with floor heating between 45% and 55% hold. Here, the LW41 was because of the fan noise in step 1 (2) and by timer 6:00 to 19:00 and evaporated thereby 3 liters. The LW45 has 3 stages. In Level 1 he is barely audible and needs only 3 watts instead of 20W. Thus, the LW45 can evaporate the 3 liters of water in step 1, the timer to 5:00 to 23:00 was changed. Instead of 13 hours now 18 hours. The very low power consumption and very low fan noise a real step forward. We are excited.