10 Best Compact Tankless Electric Hot Water Heaters 2026 in the United States

The EcoSmart ECO 27 is a compact, wall-mounted electric tankless water heater that stands out for its high power rating of 27 kW, which allows it to deliver a maximum flow rate of about 6.6 gallons per minute. This means it can supply enough hot water for multiple bathroom fixtures simultaneously in small to medium homes, making it suitable if you want a reliable flow without a bulky tank. It uses 240 volts on a single phase and offers digital temperature control with an easy-to-read LED display, so adjusting hot water temperature up to 120°F is straightforward. The heater is quite space-efficient with dimensions of 17 by 17 by 3.5 inches and weighs just under 11 pounds, which makes installation feasible in tight spots, especially compared to traditional tank water heaters. Energy efficiency is a strong point here; as a tankless unit, it heats water on demand, helping reduce energy waste and utility bills. EcoSmart backs this model with a limited lifetime warranty on key electronic components and heating elements, though the warranty doesn’t cover labor or incidental costs and requires proper registration to remain valid.

One limitation is that the maximum temperature is capped at 120°F, which might be lower than some users expect for specific needs. Also, while the flow rate is good for many households, it might be insufficient for larger homes with higher simultaneous hot water demands. The EcoSmart ECO 27 represents a smart choice if you want compact size, energy-efficient electric heating, and moderate hot water flow, but it may not be the best fit if you need very high temperature settings or serve a larger family with heavy water usage.

The Orbek 14kW tankless electric water heater provides instant hot water with a flow rate of up to 3.38 gallons per minute, suitable for 2 to 3 points of use simultaneously, such as sinks or showers. It includes a stable temperature control system that maintains water temperature within 1°F of the set level, adjustable between 86°F and 140°F through an easy-to-read LED display. Designed for high energy efficiency, it can reduce electricity costs by up to 60% compared to traditional tank heaters, utilizing water-electricity separation technology that also helps prevent scaling and corrosion.

This heater requires a 240V power supply and a dedicated 60-amp breaker, which may necessitate professional electrical installation if your home’s setup is insufficient. Its compact size (approximately 14 by 9.5 inches) saves space, making it ideal for tight installation spots. Safety features include ETL certification and multiple protections against leaks, overheating, dry heating, and electrical issues. The product comes with a warranty and 24/7 customer support for added peace of mind.

Its 14kW power rating limits its use to smaller households or point-of-use applications rather than whole-home coverage. Due to specific electrical requirements and installation considerations, it may not be suitable for those seeking a simple DIY installation or with lower electrical capacity. This model fits well for users needing reliable, energy-efficient instant hot water for a few taps or showers, who have the appropriate electrical setup and want a space-saving solution with modern controls.

The ThermoMate 11kW Electric Tankless Water Heater is a compact, wall-mounted unit designed to deliver instant hot water on demand. It offers a flow rate of about 2.15 gallons per minute with a 35°F temperature rise, which is suitable for low-flow applications like a single bathroom sink, small office break room, or similar points of use. Its maximum flow rate of 2.7 GPM means it won’t support multiple or high-demand fixtures simultaneously but shines where space is limited and continuous hot water is needed.

This model runs on 208 to 240 volts and requires a substantial 46-amp power supply, demanding a 60-amp breaker setup (two double-pole 30-amp breakers). Installation might be more involved than simpler heaters, so some electrical know-how or professional help is recommended. The heater uses self-modulating technology to adjust energy use based on water flow, achieving about 99% energy efficiency, which can cut water heating costs by up to 60% compared to traditional tank heaters.

Durability is a strong point here. The heater's alloy metal housing and separated heating element design help prevent scale and corrosion, reducing maintenance needs and enhancing longevity. Safety features include ETL certification, overheating protection, and automatic shutoff if no water is detected, which adds peace of mind. At roughly 12 by 15 inches and weighing 14.3 pounds, it is fairly compact and easy to fit into tight spaces, ideal for users looking to save floor space. However, it is intended for indoor use only and is best suited for low-demand, point-of-use scenarios rather than whole-home installation. The ThermoMate ET110 is a reliable, energy-efficient choice for users needing consistent instant hot water in compact settings, provided the electrical requirements match your setup. Its limitations in flow rate and installation complexity mean it’s less suitable for larger households or multi-fixture demands.