Rinnai RL75eN Natural Gas Tankless Water Heater, 7.5 Gallons Per Minute no fabrics Imported Comes standard with mc-91-1us digital controller with error code indicator 82-Percent thermal efficiency G13 medium bipin lamp holder. 1/2 Inch Gas Line Compatible. Wifi Capable Commercial temperature settings: 98f - 160f (commercial controller must be purchased separately)