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The Rinnai RUS75EN is an outdoor-only, natural gas condensing tankless water heater rated at 7.5 GPM and 160,000 BTU. It is ENERGY STAR certified with a 0.89 Uniform Energy Factor and is built to serve 2 to 4 bathrooms at once. Wi-Fi is not built in: a module is sold separately, and remote diagnostics let a technician check system health. It suits households with high simultaneous hot water demand and a wall or recess where outdoor mounting works. Against indoor condensing rivals it saves floor space and venting runs, but it cannot be installed indoors and needs the extra Wi-Fi module for app control.
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Lowest price we've seen: $839.99 on Nov 1 at eBay. Tracked across 4 stores since Nov 1.
Feedback is limited to a small set of ratings averaging 3.6 out of 5, so views are mixed rather than settled. Buyers who report back tend to value the endless hot water and efficiency; the main friction points are installation and the paid Wi-Fi add-on.
The Rinnai SE Series RUS75EN is an outdoor condensing tankless water heater that runs on natural gas. It has a 7.5 GPM flow rating and 160,000 BTU output, and it can supply 2 to 4 bathrooms at once. It is ENERGY STAR certified and has a 0.89 Uniform Energy Factor.
The compact white unit is built for outdoor installation and has a weather-resistant housing, which saves indoor space. It supports multiple venting configurations. It is Wi-Fi ready for smart control and monitoring, and the Wi-Fi module is sold separately. Remote diagnostics let you monitor system health.
For upkeep, inspect the vent and air intake annually for debris or blockages. Descale every 12 to 18 months and keep the area clear of leaves and dirt. Professional maintenance can be scheduled.
