10 Best Propane Tankless Water Heaters 2026 in the United States

The Rinnai RX199iN Condensing Smart Sense Water Heater is a strong contender in the propane tankless water heater category. With a commendable flow rate of up to 11.1 gallons per minute (GPM), it can support multiple fixtures simultaneously, making it ideal for larger households or busy environments. Its impressive BTU rating of 199,000 ensures quick heating, allowing you to enjoy hot water without interruptions.

One of the standout features is its energy efficiency, boasting a UEF rating of .98. This means it uses energy effectively, potentially saving you money on utility bills over time. The compact size—similar to a small suitcase—makes it easy to install in various spaces, whether indoors or outdoors, thanks to the Versa Vent system.

There are some considerations. The need for professional installation is strongly recommended, which could add to your initial costs if you don’t have a suitable technician at hand. Additionally, while the Smart Sense gas control system offers modern convenience, it requires familiarity with the system, which might be a hurdle for some users. The Rinnai RX199iN does feature user-friendly aspects, including an easy-to-use interface and a Quick Flush feature for maintenance. However, it doesn’t come with WiFi control capabilities out of the box, which could be a letdown for those looking for smart home integration. The Rinnai RX199iN is an excellent choice for those needing a reliable, efficient, and powerful tankless water heater, particularly for medium to large homes, but be prepared for installation logistics and the learning curve that comes with its smart features.

The Rinnai RXP199iN is a robust propane tankless water heater that promises to cater to a wide range of hot water needs, making it ideal for larger households or properties with multiple fixtures operating simultaneously. With a flow rate of up to 11.1 gallons per minute (GPM) and a powerful BTU rating of 199,000, this unit can deliver a consistent supply of hot water without the risk of running out, which is a major plus for busy homes.

One of its standout features is its high energy efficiency, boasting a UEF rating of 0.98. This means it can help save on energy bills compared to traditional tank heaters. The Smart-Circ Intelligent Recirculation system is another highlight, as it learns your hot water usage patterns and optimizes the recirculation accordingly, ensuring hot water is available when you need it.

Installation flexibility is another strength; it can be installed both indoors and outdoors, which gives homeowners options based on their available space. The compact design, about the size of a small suitcase, makes it easy to fit in tighter areas without compromising performance. There are a few drawbacks to consider. First, professional installation is recommended, which may add to the initial cost. While this ensures a proper setup, it requires finding a qualified technician, which could be inconvenient for some users. Additionally, while it offers WiFi connectivity through the Control-R module, this feature is sold separately, potentially leading to extra expenses if you desire smart home integration.

The Rinnai RX160iN is a versatile propane (or natural gas) tankless water heater designed to meet the needs of households wanting reliable, on-demand hot water without the bulk of traditional tanks. It delivers up to 9 gallons per minute (GPM), which is enough to run around six fixtures at once, making it well-suited for medium to large homes. With a powerful 160,000 BTU rating, it can provide strong temperature rises, even for colder water sources, ensuring steady hot water flow.

One of its standout features is high energy efficiency, rated at an impressive 0.97 Uniform Energy Factor (UEF), meaning it uses fuel very efficiently to save energy and reduce utility bills. The unit's compact size (about the size of a small suitcase) and the ability to install it indoors or outdoors add flexibility, especially with the included Versa Vent system and Smart Sense gas control which adapts to either propane or natural gas. Installation is recommended by professionals due to venting requirements and technical setup, though Rinnai provides good support with apps and guides. The Quick Flush feature simplifies maintenance, helping extend the unit’s lifespan.

A potential downside is the upfront cost and complexity of professional installation, and the WiFi control module is available separately for remote monitoring. This heater is a strong choice for those seeking efficient, high-capacity hot water with flexible installation options and modern features.