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Amazon.com: Rinnai REP160iN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater with Built-In Recirculation Pump, Up to 6.1 GPM, Indoor Installation, 160,000 BTU,

Rinnai RSC160eP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater, Up to 9 GPM, Outdoor Installation, 160,000 ,

Leading Tankless Water Heater in the US | Rinnai,

Rinnai EX22DTWN Direct Vent Wall Furnace, Indoor Natural Gas Heater, Energy Efficient Space Heater, 21,500 BTU, White - Amazon.com