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Definition of condensing water heater
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Rheem Prestige Condensing Tankless Gas Indoor Natural Gas Water Heater With Built-in Recirculation 10.0 GPM - RTGH-RH10DVLN - - Amazon.com
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The Inner Workings of a Rheem IKONIC Condensing Tankless Water Heater - Water Heating Blog - Rheem Manufacturing Company
Rinnai High Efficiency Non-Condensing 8.5 GPM Residential 180,000 BTU Interior Propane Gas Tankless Water Heater RE180iP - The Home Depot
