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 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.

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.