Rinnai RL75iP Propane Tankless Water Heater, 7.5 Gallons Per Minute Minimum/Maximum Gas Rate 10,300 to 180,000 BTU Comes standard with MC-91-1US Digital Controller with Error Code Indicator 82% Thermal Efficiency Residential Temperature Settings: 98F - 140F Commercial Temperature Settings: 98F - 160F (commercial controller must be purchased separately)