Rheem RTG-66DVN Direct Vent Natural Gas Tankless Water Heater for 2-3 Bathroom Homes,Rheem,rhertg66dvn" /> 6.6 GPM at a 45 degrees F temperature rise (up to 8.4 GPM at 35 degrees F) Exclusive! Guardian SBT sensing burner technology Exclusive! Guardian OFW overheat film wrap Self diagnostic program Digital display on thermostat shows temperature setting and maintenance/error codes