what is the best outdoor tankless water heater?
['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.']