Question: what is the best rinnai tankless water heater?
Answer: Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water Heater. ... 
Rinnai V65EP 6.5 GPM Outdoor Low NOx Tankless Propane Water Heater. ... 
Rinnai RL75IN Tankless Water Heater. ... 
Rinnai C199EN Commercial Condensing Tankless Water Heater.