10 Best Water Geysers 2025 in the United States

The Stiebel Eltron Tankless Water Heater - Tempra 29 Trend is an electric, on-demand hot water system designed for continuous flow, ensuring uninterrupted hot showers. Its compact, sleek design is a great space saver, making it suitable for whole-house use without requiring venting. The unit boasts eco-friendly features like auto-modulation, which help save energy by adjusting power usage based on demand.

Operating silently, it has a digital temperature display for easy monitoring and uses a solid copper heating system for efficient performance. With a power consumption of 28.8 kW and a required electric service of 200 A, it delivers a wide output water temperature range from 68°F to 140°F, catering to various preferences.

Safety and reliability are backed by warranties, including a 7-year leakage warranty and a 3-year parts warranty, ensuring peace of mind for users. However, its high power consumption might be a concern for some households, and the need for a 200 A electric service may require electrical upgrades in older homes. Additionally, installation and maintenance should be done by professionals due to its technical specifications and requirements.

The Rinnai V65iN Tankless Hot Water Heater is a robust choice for those seeking a continuous supply of hot water. With a capacity of 6.5 gallons per minute (GPM), it efficiently serves multiple appliances, making it suitable for medium to large households. This unit operates on natural gas and is designed for indoor installation, which can be a space-efficient solution compared to traditional tank geysers. One of the key advantages is its energy efficiency, with an energy factor of 0.82, implying that it conserves energy by only heating water when needed. This is especially beneficial for reducing utility bills in the long run.

The heating element is backed by a solid warranty—10 years for the heat exchanger, 5 years for parts, and 1 year for labor—which provides peace of mind regarding durability and service support. However, installation can be a bit challenging and is recommended to be done by a professional, which might add to the initial cost. It's also worth noting that the unit is compatible with Rinnai's digital controllers, allowing for customizable settings and enhanced usability.

In terms of safety, the water heater includes an integrated error code indicator, helping users to quickly identify and address any operational issues. The compact design makes it ideal for homes with limited space, but it does require a 120-volt power connection. While it provides excellent hot water pressure and energy efficiency, prospective buyers should consider the necessity of professional installation and ensure compatibility with their existing gas supply setup. This model is particularly advantageous for those looking to modernize their home with an efficient, long-lasting water heating solution.

The Rheem 18kW 240V Tankless Electric Water Heater is a powerful and compact solution for on-demand hot water needs. With an 18kW power consumption, it ensures efficient heating, and its advanced self-modulation feature adjusts the power to meet varying hot water demands, making it energy-efficient.

The digital thermostatic control with an LED display allows precise temperature adjustments with a +/- 1-degree accuracy, which is convenient for maintaining consistent water temperature. The copper immersion heating elements are durable and field serviceable, ensuring a longer lifespan and easy maintenance.

The flow rate of up to 4.4 GPM is suitable for households with moderate hot water needs, providing a steady supply of hot water for multiple outlets simultaneously. The bottom 3/4 inch NPT water connections and threaded design make the installation straightforward, although professional installation is recommended for optimal performance and safety.