Question: what is the best propane tankless hot water heater?
Answer: Rinnai RUC98iP Ultra Series Propane Tankless Water Heater. ... 
Eccotemp i12-LP Propane Tankless Water Heater. ... 
Camplux Outdoor Portable Gas Propane Tankless Water Heater. ... 
Eccotemp L10 2.6 GPM Portable Propane Tankless Water Heater (Our Top Pick)