Question: what is the best rated tankless hot water heater?
Answer: Rheem RTEX 13 Electric Tankless Water Heater., Stiebel Eltron Tempra Plus 24 kW., Rinnai RUC98iN Ultra Series, Concentric/Twin Pipe Installation., Features., Atmor AT-D18TP-AZ Instant Tankless Water Heater., Ecosmart ECO 27 Tankless Water Heater., Rheem RTGH-95DVLN Direct Vent Tankless Water Heater.