Atmor 13kw/240v, 2.25 GPM Tankless Water Heater Electric, Multiple Point-Of-Use Water Heater with Pressure Relief Device, AT-900-13 IDEAL for a FULL Bathroom - Sink and Shower Combination Recommended flow rate 2.25 GPM (Gallons per Minute). Water saver shower head (1.5 GPM) highly recommended for optimal performance when used as a full bathroom solution Requires a direct connection to a 60 Amp single-phase, double pole breaker. Required wire size: 4 AWG. 240 volts. 3 Settings: High - 13kw, Medium - 8.5kw, Low - 4.5 kw.Includes a Pressure Relief Device (PRD) Conserves energy - activates only with water flow at 0.5 GPM