10 Best Gas Water Heaters 2025 in the United States

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 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 RX160iN is a versatile and compact tankless water heater that can be installed either indoors or outdoors, making it a flexible option for various home setups. It has a high energy efficiency factor of 0.97, which means it can help save on energy costs over time. The water heater offers a maximum flow rate of 9 gallons per minute (GPM), allowing it to handle multiple fixtures at once, so you shouldn't run out of hot water during peak usage times. This is ideal for larger households or those with higher hot water demands.

The Smart Sense gas control system allows it to operate with either natural gas or propane, adding to its flexibility. The Quick Flush feature makes maintenance easier, potentially extending the unit's lifespan. However, the WiFi control feature is optional and not included, which could be a downside for those who prefer smart home integration. Professional installation is recommended, which might add to the upfront cost.

The unit's compact size (19"W x 31"H) is a plus for those with limited space but be mindful of the weight (54 pounds) during installation. It's essential to consult a professional to ensure it's the right fit for your home’s ground water temperature and specific needs. This water heater is a solid choice for those seeking an efficient, high-capacity solution, but be prepared for the potential additional costs of professional installation and optional accessories.