You step into the shower, turn the handle, and wait. And wait. The water takes forever to warm up, and just as you get comfortable, the tank runs out. If this sounds familiar, it might be time to ditch the bulky storage tank and switch to an electric tankless water heater. These compact units heat water instantly, giving you endless hot water while saving space and energy. In this guide, we’ve reviewed the top electric tankless water heater brands to help you find the perfect fit for your home.
We focused on brands like Rheem, Westinghouse, and ORBEK, comparing their performance, features, and reliability. Whether you need a whole-home solution or a small unit for a sink, we’ve got you covered. For a broader look, check out our best electric tankless water heater reviews for more options.
Buying Guide
Power and Flow Rate
Electric tankless water heaters come in different power ratings, measured in kilowatts (kW). The higher the kW, the more hot water it can produce per minute. For a small apartment or point-of-use application, a 3.5 kW unit like the Rheem 3.5kW Point-of-Use Thermostatic Tankless might be enough. But for a whole house, you’ll likely need something in the 18kW to 24kW range, such as the Rheem RTEX-24 24kW 240V Electric Tankless Water.
Flow rate, measured in gallons per minute (GPM), tells you how much hot water you get at a specific temperature rise. For example, the 18kW model from NOVIEEX delivers up to 4.9 GPM, which can handle two or three fixtures running simultaneously. Consider your household’s peak hot water usage to choose the right size.
Electrical Requirements
Most electric tankless water heaters require a 240V circuit, but some smaller units run on standard 120V. For instance, the Rheem 3.5kW Point-of-Use Thermostatic Tankless needs a 30-amp single-pole breaker, while the 24kW Rheem requires three 40-amp double-pole breakers. Make sure your electrical panel has enough capacity. If you’re unsure, consult a licensed electrician.
Also, check the wire gauge requirements. Higher kW units often need thicker wires, like 6 AWG or 8 AWG. The Westinghouse 14kW Tankless Water Heater Electric, for example, requires a 60A double-pole breaker and 6 AWG wire. Always verify these specs before purchasing.
Smart Features and Controls
Modern electric tankless water heaters come with digital thermostatic controls, allowing you to set the exact temperature in 1-degree increments. Some models, like the Westinghouse 14kW, even offer WiFi connectivity and voice control via Alexa or Google Home. If you love smart home integration, look for these features. They add convenience and help you monitor energy usage.
Other features to consider include LED displays, temperature memory, and self-diagnostic systems. These can make daily use easier and help with maintenance. For more insights on what to look for, check our best tankless water heater brands guide.
Safety and Certifications
Safety is non-negotiable. Look for units that are ETL certified and have multiple protection layers, such as leakage protection, overheat protection, and dry-fire prevention. The 14kW Tankless Water Heater Electric ORBEK boasts an 8-in-1 safety system, including water-electricity isolation and IPX4 waterproofing. These features ensure safe operation, especially in humid environments like bathrooms.
Also, consider the build quality. Copper heating elements are more durable and field-serviceable, as seen in the Rheem 18kW 240V Tankless Electric Water Heater. A removable inlet filter can help reduce scale buildup, extending the unit’s lifespan. For more on reliable brands, read our best gas tankless water heater brands article, though it focuses on gas, the brand reliability insights apply.
Final Thoughts
When choosing an electric tankless water heater, the right brand and size depend on your specific needs. For a whole-home solution with high flow rates and smart features, the Rheem RTEX-24 24kW 240V Electric Tankless Water is a top pick, offering up to 5.9 GPM and reliable performance. If you need a compact, budget-friendly option for a sink or small space, the Rheem 3.5kW Point-of-Use Thermostatic Tankless is an excellent choice, providing on-demand hot water without taking up much room. Both are from trusted brands and are sure to meet your hot water needs efficiently.
Frequently Asked Questions
What size electric tankless water heater do I need?
The size depends on your home’s hot water demand and your incoming water temperature. For a small apartment, a 14kW unit might suffice, while a larger home may need 24kW or more. Check the flow rate and temperature rise specifications to match your needs.
Can I install an electric tankless water heater myself?
While some DIYers can handle installation, it involves electrical work that may require permits. We recommend hiring a licensed electrician to ensure safety and code compliance. The Westinghouse 14kW Tankless Water Heater Electric includes instructions, but professional installation is advised.
Are electric tankless water heaters energy efficient?
Yes, they are highly efficient because they only heat water when you need it, eliminating standby energy loss. Many models, like the NOVIEEX 18kW, boast up to 99.8% thermal efficiency, which can reduce your energy bills significantly compared to traditional tanks.
How long do electric tankless water heaters last?
With proper maintenance, they can last 20 years or more, much longer than tank heaters. Regular descaling and filter cleaning, as recommended for the 14kW Tankless Water Heater Electric ORBEK, will help extend its lifespan. For more maintenance tips, see our electric tankless water heater reviews.
