Bosch Therm 4200, Tankless (instantaneous), Vertical, 23600 W, Solo boiler system, Indoor, Stainless steel Bosch Therm 4200. Placement supported: Vertical, Type: Tankless (instantaneous), Boiler system: Solo boiler system. Domestic Hot Water (DHW) flow: 13.6 l/min, Maximum power: 23600 W, Minimum power: 13000 W. Energy efficiency class: A, Energy efficiency scale: A+ to F. Width: 16.7" (425 mm), Depth: 8.86" (225 mm), Height: 25.8" (655 mm)