Rinnai’s name comes up constantly in tankless water heater discussions across Reddit’s plumbing communities, often as the default recommendation homeowners hear from contractors. That reputation is worth examining directly rather than taking at face value, especially now that the brand’s lineup has shifted meaningfully with the discontinuation of long-standing models like the RU199iN.
Rinnai produces a wide range of gas tankless water heaters, from smaller point-of-use-adjacent units to high-capacity condensing models like the current RX199iN and RXP199iN (both 199,000 BTU, 11+ GPM), all built on the company’s Smart Sense platform following the retirement of older models including the RU199iN in September 2024. The brand carries strong review scores across its current lineup (4.6 stars for both the RX199iN and RXP199iN on Amazon) and a broad enough retail footprint to make purchasing straightforward through major online retailers.
Rinnai’s Product Lineup Today
Rinnai’s current tankless catalog spans multiple capacity tiers, including smaller units like the RX130iN (130,000 BTU, up to 7.1 GPM) for smaller households, up through the RX199iN and RXP199iN in the 199,000 BTU class for larger homes or higher simultaneous demand. The RXP199iN specifically adds a built-in recirculation pump, addressing a feature gap that existed in older models like the discontinued RU199iN.
Rinnai also maintains commercial-grade options like the CX199iN, extending the same core condensing technology into higher-demand commercial or light commercial applications.
What Sets Rinnai Apart
Retail availability is a genuine advantage. Rinnai’s current lineup is readily purchasable through Amazon and other major retailers, a meaningful convenience compared to brands like Navien, whose NPE-240A2 appears to be sold primarily through specialty plumbing supply channels based on available sourcing. This makes comparison shopping and straightforward purchasing considerably easier for DIY-minded homeowners or those without an established relationship with a specific installer.
Rinnai’s Smart Sense platform, the foundation of its current condensing lineup, represents a meaningful update from the technology used in older discontinued models, reflected in the strong review scores its current units carry (4.6 stars across both the RX199iN and RXP199iN based on Amazon data).
Where Rinnai Faces Real Competition
Navien’s NPE-240A2 matches Rinnai’s top condensing units almost exactly on raw capacity (199,900 BTU and up to 11.2 GPM versus Rinnai’s 199,000 BTU and 11.1 GPM), meaning Rinnai doesn’t hold a decisive performance advantage in this specific size class. The choice between the two brands often comes down to price, availability, and installer familiarity rather than a clear capacity edge for Rinnai.
The Discontinuation of the RU199iN
Rinnai’s decision to discontinue the RU199iN in September 2024, confirmed by SupplyHouse.com and multiple HVAC distributors, reflects the company’s broader shift toward its updated Smart Sense platform. This is a normal part of any manufacturer’s product lifecycle, and existing RU199iN owners can continue relying on their units with standard maintenance, while new buyers are directed toward the RX199iN or RXP199iN as the direct current-generation equivalents.
Is Rinnai a Trustworthy Brand?
Based on strong current review scores, broad retail availability, and a long-standing reputation among installers reflected across plumbing forum discussions, yes, Rinnai remains a solid choice in the condensing tankless category. The brand’s willingness to update its lineup (retiring the RU199iN in favor of Smart Sense models with genuine feature improvements like built-in recirculation) suggests active ongoing investment in the product line rather than stagnation.
For a direct look at how Rinnai’s flagship current model compares to its closest competitor, see our Rinnai vs Navien comparison.
Rinnai RXP199iN Condensing Tankless Water Heater with Built-In Recirculation Pump - View on Amazon
The Bottom Line
Rinnai remains a strong, well-reviewed brand in the condensing tankless category, with broad retail availability and a current Smart Sense lineup that meaningfully improves on older discontinued models like the RU199iN. It faces genuine, closely matched competition from Navien in the same capacity tier, making the choice between them more about price and availability than a clear performance gap.
Frequently Asked Questions
Is Rinnai a good brand for tankless water heaters? Yes, Rinnai carries strong review scores across its current lineup and a long-standing reputation among installers, backed by broad retail availability through major online retailers.
What happened to the Rinnai RU199iN? It was discontinued by Rinnai on September 4, 2024, replaced by current Smart Sense models including the RX199iN and RXP199iN in the same capacity class.
Is Rinnai better than Navien? Neither brand holds a decisive capacity advantage in the high-output condensing category, Rinnai’s RXP199iN and Navien’s NPE-240A2 are nearly identical on core specs, with Rinnai generally offering easier retail access and a lower price.
What is Rinnai’s Smart Sense platform? It’s the technology foundation for Rinnai’s current condensing tankless lineup, including the RX199iN and RXP199iN, representing an update from the platform used in older discontinued models like the RU199iN.
Does Rinnai make units for smaller households? Yes, Rinnai offers lower-capacity models like the RX130iN (130,000 BTU) for smaller households with more modest hot water demand.
Where can I buy a Rinnai tankless water heater? Rinnai’s current lineup is readily available through Amazon and other major online and HVAC retailers, making it more accessible than some competing brands sold primarily through specialty suppliers.
Are Rinnai tankless water heaters reliable? Based on current Amazon review data, yes, the RX199iN and RXP199iN both hold 4.6-star ratings, reflecting positive real-world reception among recent buyers.
Does Rinnai offer commercial-grade tankless units? Yes, models like the CX199iN extend Rinnai’s condensing technology into commercial and light commercial applications with similar core capacity to residential units.
What’s the main advantage of buying Rinnai over other brands? Broad retail availability and straightforward online purchasing are genuine practical advantages, alongside strong current review scores across its updated Smart Sense lineup.
Should I buy Rinnai or wait to compare more brands? Given how closely matched top brands are on raw capacity in this category, comparing specific current models on price, features, and installer familiarity is more useful than assuming any single brand is universally superior.
References
- Rinnai official product lineup and specifications, accessed July 2026: https://www.rinnai.us
- SupplyHouse.com confirmation of Rinnai RU199iN discontinuation date, accessed July 2026
- Amazon.com live review data and pricing for current Rinnai tankless models, accessed July 2026