Noritz EZ111DV Tankless Water Heater vs Rinnai RX180iN Tankless Water Heater

Both are condensing indoor tankless heaters with 0.98 UEF, so efficiency is a tie. The Noritz EZ111DV has the higher firing rate at 199,900 BTU, dual stainless steel heat exchangers and field NG-to-LP conversion in the box; the Rinnai RX180iN is rated 10 GPM at 180,000 BTU and adds Rinnai's Smart Sense control. Owners rate the Noritz well at 4.4 out of 5. Buy the Noritz for higher hot-water demand and easier propane conversion; buy the Rinnai for its flow rating and smart controls.

• Choose the Noritz EZ111DV if you have high simultaneous hot-water demand, want dual stainless heat exchangers, or need to convert to propane in the field.
• Choose the Rinnai RX180iN if you want a 10 GPM rating and Rinnai's Smart Sense control and monitoring.