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A Rinnai tankless water heater is one of the best-known gas tankless options in the U.S. Here’s how the model lines differ and how to choose one.
Rinnai is a Japanese manufacturer with U.S. headquarters in Georgia. In North America it is best known for gas tankless water heaters, along with boilers and direct-vent wall furnaces. When people search for a "Rinnai water heater" or "Rinnai heater", they usually mean one of these product families.
| Series | Type | Typical use |
|---|---|---|
| Sensei RX / RXP | Condensing; RXP adds built-in recirculation pump | Premium whole-house, indoor |
| Sensei RU / RUR | Condensing | Whole-house, indoor or outdoor |
| RE series | Condensing | Value-focused high efficiency |
| RL series | Non-condensing | Whole-house, often outdoor |
| V series | Non-condensing | Value whole-house, often outdoor |
Rinnai updates its lineup regularly, so check the current specification sheet for each model.
The Rinnai Sensei RX series tankless water heater is Rinnai’s current flagship, with the Rinnai Sensei RX199iN tankless water heater the most popular size.
Take RU199iN as an example:
So an RU199eP is the same class of unit for outdoor installation on propane. Model numbers such as RX199iN, RE199iN and RXP199iN follow the same idea.
A Rinnai RU199iN tankless water heater, a RE199iN tankless water heater and a Rinnai outdoor tankless water heater such as the RU199eN all follow this naming. A Rinnai LP heater or Rinnai propane hot water heater ends in P.
Rinnai requires installation by a qualified professional following its installation manual and local codes. Key items include gas line sizing for up to 199,000 BTU, approved vent materials and termination clearances, a condensate drain for condensing models, and isolation valves for flushing. Rinnai’s website lists trained installers. See our installation guide.
Installing Rinnai tankless water heater models without a qualified pro can affect warranty coverage.
Rinnai units display codes such as 11 (no ignition), 12 (flame failure) and LC (scale buildup). Flush yearly, or as indicated by the LC code. See Rinnai error codes and how to flush a tankless water heater.
Rinnai publishes warranty terms by series and application. Residential coverage typically includes a long heat exchanger warranty and shorter terms for parts and labor, with conditions such as professional installation and correct water quality. Read the warranty for your model, register the unit and keep your invoice. See our warranty policy.
See current Rinnai listings with condition, specs and price.
Rinnai is a long-established Japanese manufacturer with a large U.S. installer and service network, broad product range and published warranties. Like any brand, reliability depends on correct sizing, installation and regular descaling.
Both are condensing Sensei units. The RX series is the newer line with features such as built-in Wi-Fi connectivity, and RXP versions include a built-in recirculation pump. The RU series is a long-running condensing line. Compare specifications for the exact models.
Yes. Most Rinnai tankless models come in propane versions, shown with a P at the end of the model number (for example, eP or iP).
It depends on the series and use. Residential Sensei models typically offer long heat exchanger coverage, often up to 15 years, with shorter coverage for parts and labor. Check Rinnai’s current warranty document for your model.
Yes. Rinnai also makes direct-vent wall furnaces, often called Rinnai heaters or space heaters, in natural gas and propane versions. They are separate from its water heaters.
This guide is general information for U.S. homeowners, not professional advice. Gas, electrical and venting work must follow the manufacturer’s instructions and local codes, and in most areas requires a licensed plumber, electrician or gas fitter and a permit. Specifications and prices change; always confirm details on the product page and in the installation manual.
