Rinnai® RUC98i-N RINRUC98IN | Binghamton Hardware & HVAC Supply,RU Model Series | Rinnai,Rinnai Direct Vent Gas Heater EX22 - Mount Airy Oil & Gas Company,Rinnai RSC199iN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater, Up to 11 GPM, Indoor Installation, 199,000 BTU, Gray - Amazon.com,Conversion Kit Natural Gas to Propane for RL94I 104000221