Electric tankless water heaters provide an energy-efficient solution for instant hot water without the bulk of traditional tanks. Compact and easy to install, these units adjust power to meet your hot water needs instantly. Below is a summary of top electric tankless water heaters, highlighting key features such as flow rate, energy efficiency, and installation type for easy comparison.
| Product | Power & Voltage | Flow Rate (GPM) | Key Features |
|---|---|---|---|
| Rheem 18kW 240V Tankless Electric Water Heater | 18kW / 240V | Up to 4.4 | Digital thermostatic control, self-modulating, durable copper elements |
| EcoSmart ECO 11 Electric Tankless Water Heater | 13kW / 240V | Not specified | Patented self-modulating tech, compact, 99% thermal efficiency |
| Orbek 14kW Tankless Water Heater Electric | 14kW / 240V | Up to 3.38 | Instant hot water in 3 seconds, corrosion resistant, ETL certified |
| Rheem RTEX-24 24kW 240V Electric Tankless Water Heater | 24kW / 240V | Up to 5.9 | Adjustable digital temp display, self-modulating, high flow rate |
| Rheem 11kW 240V Tankless Electric Water Heater | 11kW / 240V | Up to 2.68 | Adjustable dial control, self-modulating power control |
Rheem 18kW 240V Tankless Electric Water Heater
The Rheem 18kW Electric Tankless Water Heater features an external digital thermostatic control with an LED display that provides temperature accuracy within ±1 degree. Its advanced self-modulating technology adjusts the power output to meet hot water demand efficiently, reducing energy waste. Equipped with durable copper immersion heating elements, this model is field serviceable and built for long-term reliability. It delivers a flow rate of up to 4.4 GPM, ideal for moderate household use. This unit’s combination of precision temperature control and adaptive power modulation ensures consistent hot water while optimizing energy consumption.
EcoSmart ECO 11 Electric Tankless Water Heater
The EcoSmart ECO 11 is a compact on-demand water heater providing endless hot water with patented self-modulating technology. It continuously monitors water temperature and adjusts flow rates to maintain consistent performance within 1 degree of the selected temperature. This heater is energy efficient and saves space, being 90% smaller than traditional tank units and 99% thermally efficient. Designed for wall or point-of-use installation, it operates only when hot water is needed, avoiding standby energy losses typical of tank heaters. It runs at 13kW with a 240V power supply, suitable for small to medium water demands.
Orbek 14kW Tankless Water Heater Electric 240V
The Orbek 14kW Electric Tankless Water Heater is designed for instant hot water supply with a flow rate up to 3.38 GPM, supporting 2-3 points of use simultaneously. It features water-electricity separation technology to minimize scale buildup and corrosion, extending unit life and maintaining performance. This model delivers hot water within 3 seconds and can reduce electricity costs up to 60% compared to conventional tank heaters. It requires a 240V/60AMP breaker and is ETL certified for safety and reliability.
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater
The Rheem RTEX-24 stands out with its high power rating of 24kW at 240V and a flow rate up to 5.9 GPM, making it suitable for larger households with multiple simultaneous hot water needs. It includes an ON/OFF dial and adjustable digital temperature display. The self-modulating power control optimizes energy use by adjusting output according to demand. Its durable design and high flow capacity deliver reliable performance for whole-house applications.
Rheem 11kW 240V Tankless Electric Water Heater
The Rheem 11kW Tankless Electric Water Heater offers a compact, efficient solution for smaller homes or point-of-use applications. It features an ON/OFF dial control and self-modulating power control delivering energy-efficient heating. The unit supports a flow rate of up to 2.68 GPM, suitable for a single bathroom or kitchen. Its ease of operation and accurate temperature control provide consistent comfort for targeted usage.
Buying Guide for Electric Tankless Water Heaters
When selecting an electric tankless water heater, consider the following key factors to ensure it meets your household needs efficiently:
Power Rating and Voltage
Power (kW) and voltage determine the heat output capacity. Higher kW units provide more hot water flow and suit larger households. Common voltages are 120V for small point-of-use models and 240V for whole-house systems.
Flow Rate (Gallons Per Minute)
Flow rate indicates how much hot water the unit can deliver at one time. Calculate your household’s peak simultaneous water usage to choose a model with sufficient GPM. For example, a shower uses about 2.5 GPM, so multiple showers require higher flow capacity.
Self-Modulating Technology
Advanced units feature self-modulating technology that adjusts the heating element’s power based on water flow, improving energy efficiency and delivering consistent temperature control.
Installation and Space
Electric tankless water heaters are compact and wall-mounted, saving space compared to traditional tanks. Ensure your home’s electrical panel can support the required amperage and voltage. Professional installation is often recommended.
Energy Efficiency
Look for models with high thermal efficiency (up to 99%) and features that reduce standby energy consumption by heating water only on demand.
Durability and Certification
Choose brands with reliable heating elements, corrosion resistance, and proper certifications such as ETL for safety and quality assurances.
Temperature Controls
Digital thermostatic controls with LED displays allow precise temperature settings, while simple dial controls offer ease of use.
By comparing flow rates, power, energy-saving features, and installation requirements, you can select the most suitable electric tankless water heater that provides efficient, endless hot water tailored to your home’s needs.