10 Best Gas Water Heaters 2025 in the United States

The Ranein Natural Gas Tankless Water Heater offers a solid choice for households looking for continuous hot water without the wait. It delivers up to 4.3 gallons per minute with a strong 100,000 BTU heating power, which is enough to supply hot water to 2-3 spots like a bathroom, kitchen, or bar. Since it is tankless, it heats water instantly, so you won’t have to wait for a tank to fill up and warm. This model includes a vent pipe, which is convenient and saves you the extra cost of buying one separately. The heater is designed to adjust water temperature automatically based on the season, which can help maintain comfort and efficiency year-round.

The kitchen mode sets water temperature at 100°F, ideal for cooking and cleaning, and the bathtub mode lets you control water flow with reminders when your set amount is reached. It uses an oxygen-free copper water tank inside, which helps reduce heat loss and improve energy efficiency. However, it’s important to note that it’s not suited for high-altitude homes (above 2,000 feet), and professional installation following local codes is recommended for safety and performance. With its compact wall-mounted size, it fits well in indoor spaces but might require some planning for installation. The heater’s maximum temperature is 149°F, which meets the needs of most households.

The flow rate is good for small to medium homes, while larger homes with multiple bathrooms might find it insufficient. This unit is a suitable choice if you want reliable, on-demand hot water and prefer a natural gas tankless option that includes handy features and saves space.

The Rinnai RXP199iN Condensing Smart Sense Tankless Water Heater is designed for versatile installation, functioning both indoors and outdoors. Its dual compatibility with propane and natural gas (thanks to the Smart Sense gas control system) makes it a flexible choice. With a high flow rate of up to 11.1 GPM, it can handle multiple fixtures simultaneously, ensuring a continuous supply of hot water. The compact size, comparable to a small suitcase, is convenient for homes with limited space.

Additionally, its Smart-Circ Intelligent Recirculation technology enhances efficiency by learning your water usage patterns, which helps in reducing wait times for hot water and conserving energy. The water heater boasts a super-high energy efficiency factor (UEF) of .98, making it a cost-effective option in the long run. The inclusion of WiFi connectivity (via the Control-R module, sold separately) allows for remote control and monitoring, adding modern convenience.

On the downside, professional installation is recommended, which could incur additional costs. The unit's high heat output of 199,000 BTU and maximum pressure of 150 PSI signify robust performance, but it might be overkill for smaller households. This water heater is ideal for larger households needing a dependable and efficient hot water solution, provided that the cost and complexity of installation are not deterrents.

The Rinnai RX130iN offers impressive versatility and convenience, making it suitable for various installation environments—both indoor and outdoor—thanks to its Versa Vent feature. It can operate on either propane or natural gas, providing flexibility depending on your fuel availability. With a flow rate of up to 7.1 GPM, it ensures you never run out of hot water, easily supporting multiple fixtures simultaneously, which is ideal for larger households or demanding applications.

One of its standout features is its high energy efficiency, boasting a UEF of .97, which means it can help save on energy costs while ensuring top performance. Additionally, the compact size makes installation easier, especially in smaller spaces, though it is recommended to have a professional handle the installation to avoid complications. However, the WiFi control module for remote access isn't included, which could be a downside for users looking for smart home integration.

The heater’s design balances modern aesthetics with functionality, including easy-to-use controls and a Quick Flush feature for maintenance. These factors combined make the Rinnai RX130iN an excellent choice for those needing a reliable, energy-efficient, and versatile gas water heater, although the requirement for professional installation might be a minor inconvenience for some users.