10 Best Outdoor Propane Tankless Water Heater 2025 in the United States

The Rinnai V53DeP is a versatile outdoor propane tankless water heater designed to provide endless hot water with a maximum flow rate of 5.3 gallons per minute (GPM). This is suitable for households needing to run multiple appliances simultaneously, up to four. Its compact size (13"W x 30"H) and wall-mounting design make it space-efficient and ideal for outdoor installation.

The unit is energy-efficient, only heating water when necessary, which can help reduce energy costs. Enhanced scale detection is a notable feature that helps in preventing long-term damage, potentially increasing the heater's lifespan. However, professional installation is recommended, which might add to the initial cost.

The heater also boasts high efficiency and Wi-Fi capability, allowing for remote monitoring and control. It comes with a robust warranty: 10 years for the heat exchanger, 5 years for labor, and 1 year for parts. This product is well-suited for someone looking for a reliable, long-lasting, and energy-efficient outdoor tankless water heater capable of serving a medium-sized household.

The Rheem RTGH-95DVELP-3 is designed to cater to households needing a reliable outdoor propane tankless water heater. With a maximum flow rate of 9.5 gallons per minute, this unit is capable of providing hot water for multiple applications simultaneously, which is a significant advantage for larger families or homes with many water demands. Its high BTU rating ensures efficient heating, making it an energy-conscious choice, as it only operates when hot water is needed, potentially saving users on energy bills.

One of the standout features is the built-in EcoNet Wi-Fi technology, allowing users to control settings, track energy usage, and receive maintenance alerts from their mobile devices. This makes managing your water heater much more convenient and modern. The Hot-start programming feature helps prevent cold-water bursts, ensuring an uninterrupted flow of hot water, which is particularly beneficial during peak usage times.

In terms of safety, the LeakGuard detection and prevention feature is a great addition, giving homeowners peace of mind against potential water damage. The size is compact for an indoor unit, but users may need to ensure adequate wall space for mounting.

The Rinnai RE199eP Non-Condensing Propane Tankless Water Heater is an efficient and powerful option for those needing an outdoor installation. With a flow rate of up to 7.6 GPM, it can handle multiple fixtures simultaneously, ensuring you never run out of hot water. This model is compact, comparable to the size of a small suitcase, making it portable and easy to install in various outdoor settings.

The 199,000 BTU rating ensures quick heating, and the energy-efficient design only heats water when necessary, conserving energy. It also features a handy LED display that provides service reminders and error codes, which can be very helpful for maintenance and troubleshooting. A significant strength is its durability, backed by a robust residential guarantee (15 years for the heat exchanger, 5 years for parts, and 1 year for labor). However, professional installation is recommended, which might add to the initial cost. Furthermore, while it offers WiFi control, this requires an additional Controlr module, which is not included. The heater's design also meets strict environmental standards, such as the South Coast Air Quality Management District NOx emission levels.

One potential drawback is its non-condensing nature, which might be less efficient in capturing and reusing heat compared to condensing models. Additionally, users should verify if this heater is suitable for their region based on ground water temperature. This unit is best suited for households looking for a reliable and energy-efficient outdoor water heating solution with high flow rates and modern features.