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 Ranein Propane Gas Tankless Water Heater is designed to efficiently provide hot water on demand, making it a solid choice for households needing consistent hot water across multiple points. Its maximum flow rate of 4.3 GPM and a powerful 100,000 BTU rating allow it to serve kitchens and bathrooms effectively, ensuring you won’t have to wait for hot water to arrive. One of its standout features is the 'Four Seasons Function,' which automatically adjusts the water temperature based on seasonal changes, along with specific settings for kitchen and bathtub use, enhancing user convenience.

Additionally, this unit boasts energy-saving features, such as an oxygen-free copper water tank that minimizes heat loss and cuts down on energy consumption. It also comes with an exhaust pipe included in the kit, which saves you the additional cost of purchasing it separately.

However, there are some drawbacks to consider. The heater is not recommended for installations above 2,000 feet, which could limit its use in certain locations. Installation must comply with local regulations and should be done by a licensed professional, which might add to the initial setup cost. The unit is relatively lightweight at 28 pounds and compact in size, measuring 18.89 inches wide and 8.85 inches high, making it suitable for various indoor spaces.

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.