When it comes to efficient and continuous hot water supply for your home, choosing the best outdoor natural gas tankless water heater is essential. These units provide hot water on demand, save space by being installed outdoors, and offer notable energy savings compared to traditional tank heaters. Here, we review five highly-rated tankless water heaters from trusted brands to help you find the right fit for your needs. Whether looking for high flow rate, durable design, or smart features, our selection covers various preferences and household sizes.
| Product | Flow Rate (GPM) | BTU | Features | Brand |
|---|---|---|---|---|
| Rheem RTG-70XLN-3 | 7.0 | Not specified | Continuous hot water, energy-saving, water saving setting | Rheem |
| FOGATTI Instagas Comfort 180S | 8.1 | 180,000 | Instant hot water, outdoor durability, precise temperature control | FOGATTI |
| Rinnai V53DeN | 5.3 | Not specified | Unlimited hot water, energy-efficient, 10-year heat exchanger warranty | Rinnai |
| Rinnai RX199iN Condensing | 11.1 | 199,000 | Indoor/outdoor use, smart sense control, WiFi compatible | Rinnai |
| LiberLive Outdoor Tankless | 5.3 | 130,000 | Weather resistant, remote controller, multi-point water supply | LiberLive |
Rheem RTG-70XLN-3 High Efficiency Outdoor Tankless Water Heater
The Rheem RTG-70XLN-3 is a gray, high efficiency, non-condensing tankless water heater designed for outdoor installation. It supplies continuous hot water suitable for entire household use, handling simultaneous applications like showers and dishwashers efficiently. This model only operates when hot water is needed, reducing energy consumption and lowering utility bills. Additionally, it features a water-saving setting that helps save up to 1,100 gallons of water annually, benefiting both your bills and the environment. It is an excellent option for American families seeking reliable and eco-friendly hot water solutions.
FOGATTI Instagas Comfort 180S Outdoor Natural Gas Tankless Heater
The FOGATTI Instagas Comfort 180S stands out with its powerful 180,000 BTU output and an impressive maximum flow rate of 8.1 gallons per minute. Designed specifically for outdoor use, it features a robust build with a bottom-mounted fan that prevents smoke backflow, enhances combustion stability, and extends lifespan. Users benefit from instant hot water without wait times, and the advanced temperature control system maintains water temperature within ±1℉ variation. Its four-stage combustion system supports consistent hot water supply year-round, even in extreme weather conditions.
Rinnai V53DeN Outdoor Natural Gas Tankless Water Heater
The Rinnai V53DeN provides a flow rate of 5.3 GPM, suitable for multiple appliances or family needs. This tankless unit heats water only on demand, which conserves energy and reduces utility bills, making it an eco-conscious choice. It comes with a 10-year warranty on its heat exchanger, assuring durability. The unit’s compact design ensures easy outdoor installation, and it caters well to households seeking consistent hot water without the bulk of traditional heaters. It’s perfect for those aiming for a blend of efficiency and dependability.
Rinnai RX199iN Condensing Tankless Water Heater – Indoor/Outdoor Use
The Rinnai RX199iN is a versatile, powerful option, installation-ready for indoor or outdoor use with the appropriate venting. It supports up to 11.1 gallons per minute, serving up to seven fixtures simultaneously—ideal for larger homes or heavy usage scenarios. Powered by 199,000 BTU, this condensing water heater utilizes a Smart Sense gas control system and boasts a high energy efficiency (UEF 0.98). It also offers smart technology features like WiFi compatibility (with an additional Controlr module) and an intuitive interface, elevating user control and convenience.
LiberLive Outdoor Natural Gas Tankless Water Heater with Remote
The LiberLive Outdoor Tankless Water Heater is built with durability in mind, featuring thickened corrosion-resistant materials and stainless steel vents. This unit deals well with harsh weather including high winds (force 8), freezing temperatures, and intense sunlight, making it a great choice for challenging outdoor environments. Rated at 130,000 BTU and a flow rate of 5.3 GPM, it meets the demands of multiple outlets simultaneously. Included is a remote controller for convenient temperature adjustments. This heater is both energy-efficient and CSA certified for safety.
Buying Guide For Outdoor Natural Gas Tankless Water Heaters
Choosing the right outdoor tankless water heater requires considering several factors to meet your household’s hot water needs effectively and efficiently.
Flow Rate and Capacity
Gallons Per Minute (GPM) indicates the volume of hot water the unit can deliver. Consider your peak water usage—showers, washing machines, dishwashers—and select a model that supports multiple simultaneous fixtures. Typical family needs range from 5 to over 10 GPM.
BTU Rating and Energy Efficiency
The British Thermal Units (BTU) rating reflects the heater’s power output. Higher BTUs usually mean faster heating and better performance during heavy usage. Check the unit’s Uniform Energy Factor (UEF) or Energy Factor for efficiency ratings; higher values denote better energy savings.
Outdoor Durability and Weather Resistance
Since installation will be outdoors, ensure the water heater has corrosion-resistant materials, waterproof ratings (e.g., IPX4 or higher), and protection against extreme weather, wind, and freezing temperatures. Models with features like built-in freeze protection and strong fans to prevent smoke backflow are preferable.
Installation and Venting Requirements
Check if the unit is designed specifically for outdoor installation to avoid complicated venting. Some models offer versatile indoor/outdoor installation options with smart venting kits. Confirm compatibility with your home’s existing gas lines and water connections.
Safety Features
Look for built-in safety mechanisms such as flame failure protection, dry combustion protection, overheat shutdown, and anti-freeze systems. Certification marks like CSA or UL indicate compliance with safety standards.
Smart Features and Controls
Some modern tankless water heaters offer digital controls, WiFi compatibility, and remote operation, providing convenience in monitoring and adjusting temperature settings without physical access to the unit.
Warranty and Support
Longer warranty terms on heat exchangers and labor indicate manufacturer confidence and help protect your investment. Consider options with readily available customer support and maintenance services.
Every home’s needs are unique, so evaluate these factors in light of your household size, climate, budget, and installation preferences to choose the best outdoor tankless natural gas water heater that delivers reliable, efficient, and continuous hot water year-round.