10 Best Portable Water Heater 2025 in the United States

The Rheem RTEX-24 Electric Tankless Water Heater offers a solid performance for those needing an on-demand and consistent hot water supply. With a 24kW power source, it is capable of delivering up to 5.9 gallons per minute, making it suitable for larger households or multiple simultaneous hot water uses. The adjustable digital temperature display and self-modulating power control are excellent for precise temperature management, allowing users to set and maintain their desired water temperature easily.

Safety is also considered with its sturdy build and reliable performance features, including a maximum pressure capacity of 150 PSI. However, at 17.8 pounds and designed for wall mounting, it may not be as portable as some other models on the market, making it less ideal for frequently moving around or for outdoor use. The installation might require professional help due to its electric and wall-mounted nature. The LED display adds a modern touch and makes it simple to monitor and adjust settings.

The Rheem RTEX-24 is highly efficient, with a 99.8% energy efficiency rating, which can save on electricity bills. It scores well on durability with a stainless steel finish, suggesting a long-lasting product, although its weight and mounting requirements might limit portability. This heater is best suited for indoor use in permanent locations where reliable and continuous hot water is essential.

The Rheem 18kW 240V Tankless Electric Water Heater is a powerful and efficient option for those needing a reliable source of hot water. With an 18,000-watt power source, it offers substantial heating capacity, providing a flow rate of up to 4.4 gallons per minute (GPM). This makes it suitable for households with moderate hot water demands.

The external digital thermostatic control with a precise LED display allows for easy and accurate temperature adjustments, ensuring user comfort and safety. The advanced self-modulation technology helps optimize energy usage by adjusting power according to the hot water demand, which is both efficient and eco-friendly.

The Rheem RTG-84DVLP-3 is a high-efficiency, non-condensing indoor tankless water heater, powered by liquid propane. This unit boasts a substantial heating capacity with a maximum flow rate of 8.4 gallons per minute, making it suitable for a household that requires continuous hot water for multiple applications simultaneously, such as showers and dishwashers. One of its standout features is the Hot-start programming, which keeps the water heater in a ready state to avoid cold-water bursts, ensuring comfort whenever hot water is needed.

Additionally, the water-saving setting can save up to 1,100 gallons of water per year, which can be beneficial for environmentally conscious users and those looking to reduce their utility bills. The LeakGuard Leak Detection and Prevention feature adds an extra layer of safety by detecting and preventing potential leaks, which is a crucial safety aspect. Despite its robust capabilities, the unit is reasonably portable with dimensions of 13.5 inches in width, 24.2 inches in height, and a weight of 46.5 pounds. However, it is designed for indoor installation and wall mounting, which might limit its portability compared to other models designed for more varied placements.

The ease of use is enhanced by the included display, which provides essential information and controls. Durability seems promising, given Rheem's reputation and the unit's build quality. On the downside, its indoor installation requirement means it might not be the best fit for users seeking an outdoor or more mobile solution.