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Gas Condensing
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OT300LP
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Rheem Prestige Condensing Tankless Indoor Natural Gas Water Heater 6.8 GPM - RTGH-68VLN-2 - Amazon.com
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Rinnai High Efficiency Non-Condensing Smart-Circ 6.6 GPM Residential 160,000 BTU Interior Natural Gas Tankless Water Heater REP160iN - The Home Depot
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Rheem RTGH-68XLN-2 HE Natural Gas Condensing Tankless Water Heater (Outdoor)
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Heat Pump Water Heaters | Department of Energy
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Definition of condensing water heater
