10 Best Propane Tankless Water Heaters 2025 in the United States

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 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 Rheem RTGH-95DVELP-3 is a propane-powered tankless water heater designed for indoor installation, providing a strong flow rate of 9.5 gallons per minute. This makes it capable of supplying enough hot water to comfortably serve multiple outlets simultaneously, like showers and dishwashers. It operates with high energy efficiency at 93%, which means it heats water effectively while helping reduce energy costs since it only runs when hot water is needed. The unit includes advanced features such as built-in EcoNet Wi-Fi technology, allowing you to control the water temperature, monitor usage, and receive maintenance alerts directly from your smartphone, which adds convenience and peace of mind. Another notable feature is the LeakGuard leak detection system, which helps protect your home from water damage by identifying leaks early.

The heater supports a maximum water temperature of 140°F and uses hot-start programming to avoid cold water bursts, enhancing user comfort. With dimensions of about 18 by 24 inches and weighing just over 50 pounds, it is relatively compact for an indoor tankless model but does require proper venting and wall mounting, which might need professional installation. It is well suited for homeowners looking for an energy-efficient, high-capacity propane tankless heater with smart features, especially those comfortable with or able to arrange professional installation.