Noritz EZ111DV Tankless Water Heater vs Rinnai RU199iN Tankless Water Heater

Both are 199,000 BTU condensing indoor tankless units with stainless heat exchangers, so the real split is efficiency versus flow and controls. The Noritz EZ111DV rates higher on efficiency at 0.98 UEF and ships with an NG-to-LP conversion kit, which suits propane homes and buyers chasing the lowest gas use. The Rinnai RU199iN is the Sensei line with a 0.4 GPM minimum flow, 15,000 BTU minimum input, ultra-low NOx rating and optional Wi-Fi monitoring, which suits larger homes with several fixtures and small draws like a single tap. Owners of both report reliable hot water; the Rinnai's wider modulation and smart-home path are the main reasons to step up.

• Choose the Noritz EZ111DV if you run propane or want the highest listed efficiency and a field gas conversion in the box.
• Choose the Rinnai RU199iN if you have several bathrooms, want fine low-flow modulation and a path to Wi-Fi monitoring.