Question: what is the best tankless hot water heater on the market?
Answer: Rheem RTEX 13 Electric Tankless Water Heater., Ecosmart ECO 27 Electric Tankless Water Heater., Rinnai V65iN Indoor Tankless Water Heater – Natural Gas., Rheem RTGH-95DVLN Direct Vent Tankless Natural Gas Water Heater.