10 Best Portable Water Heater 2025 in the United States

The Stiebel Eltron Tempra 24 Plus is an electric tankless water heater that offers continuous hot water on demand with advanced flow control technology, ensuring comfort and preventing interruptions during use. Its sleek design is compact and saves space, making it a good fit for homes with limited room. The unit is eco-friendly, with energy-saving features such as auto-modulation and electronic water flow control.

The digital temperature display and preset memory buttons simplify operation, and the solid copper heating system adds to its reliability and performance. Safety features include the option to limit the maximum hot water temperature to prevent scalding, which is particularly useful for households with children or elderly members. Additionally, the product comes with substantial warranties, providing assurance on leakage and parts reliability for several years.

However, the high power requirement (150 A electric service) might be a drawback for those with older electrical systems, and the initial installation might require professional assistance due to the electrical specifications. Despite these considerations, the Stiebel Eltron Tempra 24 Plus is a robust choice for providing consistent hot water with efficient energy use and user-friendly controls.

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.

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.