Check the listing for details. Bosch Thermotechnology Tronic 6100 Electric Tankless Water Heater, 18 kW, White. Color: White, Condition: Used, Made in United States. Listed at 248.00 USD. OPEN BOX AND SLIGHTLY USED 18 KW TANKLESS WATER HEATER: Designed specifically for point of use applications to provide an endless supply of instantaneous hot water for one or more commercial or residential sinks COMPACT AND LIGHTWEIGHT: Effortlessly fits under sinks GREAT FOR LOW-FLOW FAUCETS: With as low as a 0.55 GPM activation flow rate, it's perfect for commercial low-flow faucets in shopping malls, airports, stadiums, offices, and more EFFICIENT AND DURABLE: 96% thermal efficiency with no standby heat loss to save you time, water, and money, and comes incased in a durable white plastic housing that blends in with existing décor EASY TO MAINTAIN: Because the heater runs on electricity and doesn't hold any water, there is no venting and virtually no maintenance required