Question: what is the best outdoor tankless gas water heater?
Answer: Rinnai V65EP 6.6 GPM Outdoor Tankless Propane Water Heater. ...  Rheem RTG-95XLN Outdoor Tankless Natural Gas Water Heater. ...  Takagi T-K4-OS-NG Tankless Water Heater. ...  Rinnai RL94eN Natural Gas Tankless Water Heater. ...  Eccotemp 45H-NG Outdoor Tankless Water Heater.