Question: what is the best residential tankless water heater?
Answer: Rinnai RUR98iN (Top Overall) ...  Rinnai RUC98iN (Indoor) ...  Rheem RTG-84XLN (Outdoor) ...  Rheem RTGH-95XLN (Best Outdoor) ...  Takagi T-KJr2 IN-NG (Indoor) ...  Stiebel Eltron Tempra Plus 24 (Best Electric) ...  Eemax EEM24027 (Electric) ...  EcoSmart ECO 27 (Electric)