10 Best Tankless Water Heaters 2026 in the United States

The Stiebel Eltron Tempra 29 Trend is a compact electric tankless water heater that provides continuous hot water on demand without running out, making it well suited for households wanting energy efficiency and space savings. Its sleek design fits well in tight spaces, and being electric, it doesn’t require venting, which simplifies installation in many homes. With a powerful 28.8 kW output and a temperature range up to 140°F, it can comfortably handle the hot water needs for a medium to large household, especially in warmer climates or for moderate flow rates around 3-4 gallons per minute.

The digital LED display allows easy temperature adjustments, and its silent operation adds to user comfort. However, it requires a minimum 200-amp electrical service, which may mean upgrading home wiring if your system is older or lower capacity. The unit’s water capacity is very small (0.39 gallons), typical for tankless models, so it heats water instantly but demands stable electrical supply. Maintenance is generally low but periodic descaling may be needed depending on water hardness. The included 7-year leakage and 3-year parts warranties provide solid peace of mind.

This model suits those who want a reliable, energy-saving electric tankless heater with easy installation in homes prepared for its electrical requirements.

The Rheem RTGH-95DVLN-3 is a solid choice for those in need of a tankless water heater, especially for residential use. With a flow rate of up to 9.5 gallons per minute, it can easily meet the hot water demands of larger households or simultaneous usage across multiple fixtures. Its energy efficiency rating of 0.93 ensures that it operates economically, which can translate to lower energy bills over time.

One standout feature is the integrated digital display, making it easy to monitor and adjust temperature settings, which range from 100 to 140 degrees Fahrenheit. This adaptability allows users to find a comfortable temperature that suits their needs. Additionally, the natural gas fuel type is generally more efficient than electric options, further enhancing its appeal.

On the downside, installation can be a bit tricky if you're not familiar with gas appliances. It requires a wall-mounted setup and adequate venting, which might necessitate professional installation, adding to the cost. The warranty coverage, while decent with a 1-year labor and 5-year parts warranty, might be considered lacking compared to competitors that offer longer terms.

Another point to consider is that the heater's weight (about 59.9 pounds) and size (17.7”W x 23.7”H) may pose challenges during installation, especially in tighter spaces. It’s essential to ensure that your home can accommodate this unit before purchasing.

The Rheem RTGH-95DVLN-3 is a robust option for families seeking efficient hot water solutions. Its high flow rate and energy efficiency make it a strong contender in the tankless water heater market, but potential buyers should weigh the installation requirements and warranty duration against their specific needs.

The Rheem 18kW 240V Tankless Electric Water Heater is a compelling option for those looking for an efficient, easy-to-install solution for their hot water needs. One of its standout features is the external digital thermostatic control with an LED display, which offers precise temperature control with +/- 1 degree accuracy. This makes it user-friendly and ensures you always get the perfect water temperature.

Its advanced self-modulation technology is another highlight, as it adjusts power usage based on your hot water demand, contributing to energy efficiency and potentially reducing your energy bills over time. The unit's flow rate is up to 4.4 gallons per minute (GPM), which should be sufficient for small to medium households but might not meet the demands of larger families with high simultaneous water usage.

The heater uses durable copper immersion heating elements that are field-serviceable, enhancing its longevity and ease of maintenance. Installation is straightforward with bottom 3/4 inch NPT water connections and threaded design, making it simple to replace existing water heaters. The compact size (14.5 inches wide and 18.25 inches high) allows it to fit in tight spaces, adding to its versatility. However, as an electric unit, it may not be as powerful as gas models in terms of temperature rise, especially in very cold climates.