Question: what is the best condensing tankless water heater?
Answer: Takagi T-H3-DV-N Condensing Natural Gas Tankless Water Heater. ... , Rinnai RUR98iN Ultra Series Heater. ... , Noritz NRC661-DV-NG Condensing Direct Tankless Hot Water Heater. ... , Naiven NPE-240-A Tankless Gas Water Heater. ... , Rheem RTGH-84XLP Condensing Propane Tankless Water Heater.