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 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.

The CAMPLUX 2.64 GPM Propane Portable Gas Water Heater is a versatile option for outdoor use, especially for camping. One of its key strengths is the flow rate of 2.64 gallons per minute which is sufficient for most outdoor shower needs. The 68,000 BTU rating indicates a good heating capacity, ensuring you get hot water quickly. The heater is energy efficient with an 11.5% energy saving technology, making it both eco-friendly and cost-effective over time.

The temperature range is fairly wide, reaching up to 167°F, which should be suitable for various outdoor conditions. It also features a digital display for easy temperature monitoring and adjustment. Safety is a significant focus with this model, as it includes CSA safety certification, flame failure device, and overheat protection. Additionally, it has an anti-freezing feature which is excellent for use in colder climates.

The water heater is very portable, weighing just 23 lbs, and its compact size makes it easy to carry and install quickly — usually within 15 minutes. However, it requires 2 D batteries for ignition which are not included, adding to the initial setup cost. Another minor drawback is the need to ensure proper sealing to prevent gas leakage. It is also important to note that although it's designed for outdoor use, it can be installed indoors if proper ventilation is ensured. Customer support is readily available, which is a plus point for addressing any concerns or issues. This product is well-suited for those who need a reliable, portable, and efficient water heating solution for outdoor activities.