Choosing the best electric tankless water heater comes down to more than just brand name. You need the right balance of flow rate, power, efficiency, and installation requirements for your home.
Electric tankless water heaters are popular because they are compact, energy-efficient, and easier to install than gas models since they do not require venting. They can work very well for apartments, small homes, point-of-use setups, and even some whole-house applications when properly sized.
In this guide, we cover the best electric tankless water heaters in 2026, what each model is best for, and how to choose the right one for your needs.
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Quick Comparison: Best Electric Tankless Water Heaters (2026)
| Model | Type | Max GPM | Best For |
|---|---|---|---|
| Stiebel Eltron Tempra 36 Plus | Electric | 7.5 GPM | Best overall |
| EcoSmart ECO 27 | Electric | 6.5 GPM | Whole house |
| Rheem RTEX-24 | Electric | 5.9 GPM | Small homes |
| EcoSmart ECO 11 | Electric | 2.6 GPM | Point of use |
| Rheem RTEX-18 | Electric | 4.4 GPM | Budget option |
🏆 Best Overall Electric Tankless Water Heater
Stiebel Eltron Tempra 36 Plus
The Stiebel Eltron Tempra 36 Plus is one of the most powerful electric tankless water heaters available and is often considered the best overall choice for homeowners who want strong performance without using gas. It offers advanced flow control technology that helps maintain a consistent water temperature even when multiple fixtures are running.
This unit is designed for whole-house use in homes with the electrical capacity to support a high-power electric heater. It is known for reliability, quiet operation, and very stable temperature output compared to many cheaper models.
Key features:
- Up to 7.5 GPM flow rate
- Advanced flow control system
- Digital temperature display
- Very consistent output
- High build quality
⚡ Best Electric Tankless Water Heater for Whole House
EcoSmart ECO 27
The EcoSmart ECO 27 is one of the most popular electric tankless water heaters for whole-house use. It offers a strong balance between power, price, and efficiency, making it a good option for medium-size homes that need reliable hot water for multiple fixtures.
The unit uses self-modulating technology to adjust energy use based on demand, which can help improve efficiency compared to traditional water heaters.
Key features:
- Up to 6.5 GPM flow rate
- Self-modulating energy control
- Compact wall-mounted design
- Good balance of performance and cost
🏠 Best Electric Tankless Water Heater for Small Homes
Rheem RTEX-24
The Rheem RTEX-24 is a good choice for small homes, condos, or households with moderate hot water demand. Rheem is a well-known water heater brand, and this model offers reliable performance with simple controls and durable heating elements.
It works well when only one or two fixtures are used at the same time and can be a practical option when a full whole-house unit is not necessary.
Key features:
- Up to 5.9 GPM flow rate
- Digital temperature control
- Durable copper heating elements
- Compact design
🚿 Best Electric Tankless Water Heater for Point-of-Use or Apartment
EcoSmart ECO 11
The EcoSmart ECO 11 is a smaller electric tankless water heater designed for point-of-use applications or apartments with lower hot water demand. It can be used for a single shower, sink, or small living space where a full-size unit is not required.
Because of its compact size, it is often easier to install and does not require as much electrical capacity as larger models.
Key features:
- Up to 2.6 GPM flow rate
- Compact size
- Energy-efficient operation
- Good for small spaces
💰 Best Budget Electric Tankless Water Heater
Rheem RTEX-18
The Rheem RTEX-18 is a good budget-friendly electric tankless water heater for homeowners who want on-demand hot water without the cost of a high-power unit. It provides enough output for small homes, apartments, or limited hot water use.
It offers simple controls, reliable performance, and a lower price compared to larger whole-house electric tankless heaters.
Key features:
- Up to 4.4 GPM flow rate
- Simple digital control
- Compact design
- Lower cost than high-power units
How to Choose the Best Electric Tankless Water Heater
Choosing the best electric tankless water heater depends on your home size, hot water demand, and electrical capacity. Electric models are efficient and compact, but they must be sized correctly to avoid running out of hot water.
1. Choose the correct flow rate (GPM)
Flow rate determines how many fixtures you can run at the same time.
2–3 GPM → sink or single shower
4–5 GPM → small home
6–7+ GPM → whole-house use
If you are not sure what size you need, see our tankless water heater size chart to estimate the correct flow rate for your home.
2. Check your electrical capacity
Electric tankless water heaters require more power than traditional tank heaters. Larger models may need multiple breakers and enough panel capacity to support the load.
In some homes, installation may require electrical upgrades, which can affect the total tankless water heater installation cost.
3. Consider climate and incoming water temperature
In colder climates, incoming water temperature is lower, so the heater must work harder to reach the desired temperature. This can reduce the effective flow rate of electric units.
In warmer climates, electric tankless water heaters usually perform better because the temperature rise required is smaller.
4. Electric vs gas tankless water heaters
Electric tankless water heaters are easier to install and do not require venting, but they usually have lower maximum output than gas models.
If you are unsure which type is better for your home, see our electric vs gas tankless water heater comparison.
5. Maintenance and lifespan
Electric tankless water heaters generally require less maintenance than gas units, but periodic flushing and inspection are still recommended to keep performance consistent.
Regular care can extend the life of the unit.
Electric vs Gas Tankless Water Heaters
Electric models are often easier to install because they do not require venting or combustion air adjustments. They are also compact and can be a good choice for smaller homes or places where gas is not practical.
Gas tankless water heaters usually offer higher flow rates and are often better for large households with heavy simultaneous hot water demand.
Pros of Electric Tankless Water Heaters
Electric tankless water heaters offer several advantages:
- no venting required
- compact size
- quieter operation
- lower maintenance than gas units
- high efficiency
- good option for small homes and point-of-use setups
Cons of Electric Tankless Water Heaters
They also have limitations:
- may require major electrical upgrades
- lower max output than gas units
- performance drops more in colder climates
- not every model is suitable for whole-house demand
For a wider view, you can also read our tankless water heater pros and cons guide.
Do Electric Tankless Water Heaters Need Maintenance?
Yes, although maintenance is generally simpler than with gas models.
Basic maintenance may include:
- flushing to reduce mineral buildup
- checking heating elements
- inspecting electrical connections
Regular care can help extend service life. Learn more in our tankless water heater maintenance and care guide.
FAQ
What size electric tankless water heater do I need?
The right size depends on how many fixtures you plan to run at the same time. Smaller units can handle one sink or shower, while larger models are required for whole-house use. If you are unsure, use our tankless water heater size chart to estimate the correct flow rate for your home.
Can an electric tankless water heater run a whole house?
Some high-power electric tankless water heaters can supply hot water to an entire home, but this depends on electrical capacity and incoming water temperature. Larger units may require multiple breakers and enough panel capacity to support the load.
Are electric tankless water heaters cheaper to install than gas?
Electric models are often easier to install because they do not require venting or gas lines. However, some homes may need electrical panel upgrades, which can increase total tankless water heater installation cost.
Do electric tankless water heaters require maintenance?
Yes. Electric tankless water heaters should be flushed periodically to prevent mineral buildup and maintain efficiency. Regular care can help extend the life of the unit and keep performance consistent.
Conclusion
The best electric tankless water heater depends on your home size, hot water demand, and electrical setup.
If you want premium whole-house performance, the Stiebel Eltron Tempra 36 Plus is one of the strongest options. For a balance of value and performance, the EcoSmart ECO 27 is a popular choice. For smaller homes and apartments, models like the Rheem RTEX-24, EcoSmart ECO 11, or Rheem RTEX-18 can be a better fit.
The key is choosing a unit that matches your real-world demand rather than simply buying the biggest model available.