Rheem RTGH-SR11i IKONIC Super High-Efficiency Condensing Tankless Gas Water Heater with Recirculation Pump & Wi-Fi vs Rinnai RE199IP Tankless Water Heater

The Rheem RTGH-SR11i is the stronger choice for most homes: it is condensing (0.96 UEF), has a built-in recirculation pump for near-instant hot water, and offers Wi-Fi control. The Rinnai RE199IP is a simpler non-condensing unit with a lower 0.82 UEF and an 8.5 GPM flow range, but Rinnai's reputation for reliability and long service life is well earned. Buy the Rheem for efficiency, recirculation and smart features; buy the Rinnai if you want a proven, straightforward workhorse and don't need condensing efficiency or a recirculation pump.

• Choose the Rheem RTGH-SR11i if you want condensing efficiency, no-wait recirculation and app control, and your venting can handle PVC runs.
• Choose the Rinnai RE199IP if you want a proven non-condensing unit with strong flow and simple installation, and you don't need recirculation or Wi-Fi.