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.