10 Best Electric Water Heaters 2025 in the United States

The Stiebel Eltron Tempra 20 Trend is a compact tankless water heater designed to provide on-demand hot water without the need for a storage tank. Its continuous flow feature means you won’t run out of hot water during showers, making it suitable for small to medium households. With a 19.2 kW power rating and a maximum flow rate of about 2 gallons per minute, it can handle multiple bathroom uses but may struggle with very large households needing simultaneous showers.

This model is energy-efficient thanks to its auto-modulation technology, which adjusts power based on water flow, reducing wasted energy. It’s also a space saver, with a slim design that mounts on the wall and requires no venting, making installation easier in tight spaces. The digital LED display allows easy temperature control between 68° and 140°F. While tankless heaters don’t have a traditional First Hour Rating (FHR), its continuous flow design compensates by providing hot water as needed.

The Tempra 20 Trend has strong safety features and certifications (ANSI, CSA, NSF, UL), ensuring reliable operation. You get a 7-year warranty against leaks and a 3-year parts warranty, which shows the brand’s confidence in durability. One thing to note is the electrical service requirement: it needs a 240V supply and a 125-amp minimum service, which might require an upgrade in some homes. This heater is ideal if you want endless hot water in a small package and are comfortable with the electrical requirements. It’s quiet, efficient, and backed by solid warranties, but its flow rate means it’s better suited for moderate, not very high, hot water demand.

The Stiebel Eltron Tempra 24 Trend is a compact electric tankless water heater designed to provide endless hot water on demand, making it a good choice for those wanting continuous flow without running out. Its 24 kW power and 240V operation mean it can handle a decent-sized household's hot water needs, though it requires a strong electrical service (recommended 150 A), which might need upgrading in some homes. Since it heats water as you use it, there's no storage tank, saving space and avoiding standby heat loss, which helps with energy efficiency. The unit features auto-modulation, adjusting power based on your hot water demand to reduce energy waste.

Its size (about 16.6" wide and 14.5" high) and wall-mount design make it ideal for smaller installation spaces. The LED digital temperature display is easy to read, and the heating elements inside are made of solid copper, known for durability and efficient heat transfer. The heater provides water temperature control between 68°F and 140°F, suitable for most household needs. The 7-year warranty against leaks and a 3-year parts warranty reflect confidence in reliability. Installation requires some electrical know-how due to its power demands, which might mean professional help is needed. It operates silently, adding to comfort.

If your household has very high simultaneous demand (multiple showers, appliances at once), its flow rate might limit how much hot water can be delivered at once, so checking your usage patterns is important. This heater is well-suited for homeowners looking for energy-efficient, space-saving, and reliable hot water on demand, especially in homes with adequate electrical infrastructure.

The BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon offers a compact and efficient solution for immediate hot water needs. With a 4-gallon capacity, it's ideal for small spaces like under-sink installations. Its 98% thermal efficiency ensures minimal energy waste, making it a cost-effective choice. The heater’s fast recovery rate is beneficial, providing quick access to hot water, and can supply up to two sinks simultaneously.

Installation is flexible and straightforward with options for shelf, wall, or floor mounting, and the unit plugs into a standard 120-volt outlet, avoiding complex electrical work. The heater’s glass-lined interior is designed for longevity, though regular maintenance of the anode rod is crucial to prevent leaks and maintain its durability. It’s important to note that neglecting this maintenance can void the warranty.

Bosch provides a 6-year coverage on the unit and 2 years on parts, which offers some peace of mind but requires attention to upkeep. In terms of size, the heater is compact with dimensions of 13.75 x 13.75 x 13.5 inches, fitting neatly in tight spaces, but potential users must ensure they have sufficient room for installation. Safety-wise, the heater supports a maximum pressure of 150 PSI and a maximum temperature of 140°F, suitable for typical household needs. This unit is ideal for individuals seeking an on-demand, space-saving hot water solution with low energy usage, though it may not be suitable for larger households or situations requiring higher flow rates or capacities. As a point-of-use heater, it's best suited for specific application areas rather than whole-home water heating needs.