C means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Regulation 2017/1369/EU. C Bosch Serie 4 WAN2428KPL, Front-load, 17.6 lbs (8 kg), B, 76 dB, 1200 RPM, C Bosch Serie 4 WAN2428KPL. Loading type: Front-load. Drum capacity: 17.6 lbs (8 kg), Spin-drying class: B, Noise level (spin): 76 dB, Noise level (wash): 52 dB, Maximum spin speed: 1200 RPM. Product color: White. Width: 23.5" (598 mm), Depth: 21.7" (550 mm), Height: 33.4" (848 mm). Energy efficiency class: C