Rheem RTGH-SR11i IKONIC Super High-Efficiency Condensing Tankless Gas Water Heater with Recirculation Pump & Wi-Fi vs ThermoMate RTC68iN Tankless Water Heater

The Rheem RTGH-SR11i is the stronger unit for most whole-house installs. It moves more hot water (11.2 vs 9.38 GPM), runs more efficiently (0.96 vs 0.91 UEF), and adds a built-in recirculation pump and Wi-Fi control the ThermoMate lacks. The ThermoMate RTC68iN is a solid condensing heater with a copper primary exchanger and standard PVC venting, but it is a smaller, simpler machine with fewer smart features. Rheem's stainless primary and secondary exchangers and long warranty record give it the edge on build; owners of both brands report reliable hot water, though Rheem has the deeper service network.

• Choose the Rheem IKONIC SR11i if you want no-wait recirculated hot water, app control, higher flow for a large household, and the longer warranty and service network.
• Choose the ThermoMate RTC68iN if you have a smaller household, want a straightforward condensing heater with standard PVC venting, and do not need recirculation or Wi-Fi.