Cleaning Technology for Indoors! This Karcher all-electric hot water pressure washer introduces hot-water tank technology to deliver hot water on demand ideal for indoor cleaning. Water is heated by flowing through a coil inside an 80-gallon water tank. Heating elements generate 138,000 BTU to produce hot water of up to 180F. Features: Heavy-duty, steel cabinets are protected by an epoxy powder coat finish; upper cabinet ventilated for cool operation - Thermal pump saver valve prevents damage by venting recirculated water Low-water flow switch prevents damage to heating elements due to lack of water - Easy-to-attach detergent injector and four quick couplers nozzles - Auto start function allows unit to be turned on with pull of the trigger - EASY!Force gun with cruise control like technology - uses its own recoil force to hold the trigger down - so no more sore hands after hours of use.