Stiebel Eltron TEMPRA36B Electric Tankless Water Heater, 36B 240/208V, 36 kW Reduces hot water costs up to 60% over conventional electric water heaters Installation is quick and easy, requiring no venting or pressure relief valves, the compact size allows installation almost anywhere This power control system manages power usage for maximum efficiency and temperature stability. At rest, the unit uses no power at all Unit Provides 88F rise in water Temperature at 1.5GPM, 58F Rise at 2.25GPM, and 44F Rise at 3GPM Can be used with hard, soft, city or well water