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Electric tankless water heaters are a great alternative to the conventional type with a tank. The pros and cons of tankless water heaters are favorable to the other types of water heaters.
Even so, it is not the best-looking part of your interior design so you might still want to look into ways on how to hide your water heater. Fortunately, that is much easier when you are only dealing with the compact version that could even fit under a sink.
If you don’t have time to read the full review, here are our top 3 most popular picks:
Table of Contents
Best Tankless Electric Water Heater Reviews
So are you interested in saving space and energy costs? Of course, you are. To help you do just that here are some electric tankless water heater reviews that cover the best of the best in regards to heaters for your home.
From the most popular tankless electric water heaters to the easiest installations. Read on for a review of the 10 best electric tankless water heater available on the market today.
1. EcoSmart ECO 27 with Patented Self-Modulating Technology
Most Popular Electric Tankless Water Heater
| Dimensions | 17 x 17 x 3.75 in |
| KiloWatts | 27 kW |
| Voltage | 240 |
| Temperature Range | 80°F – 140°F |
This model by EcoSmart outranks the alternatives by far. It is an extremely popular purchase with good specs and a limited lifetime warranty.
This is one of the larger versions in the range with 27 kW which makes it most suitable for households in the colder Northern United States. It has a capacity of heating up 3 gallons per minute when the incoming water is as cold as 37°F.
This home appliance can save you up to 50% on your electricity bills compared to a water heater with a tank. It is also precise since it features a digital temperature display (also convertible to Celsius) that lets you adjust by 1°F increments.
Overall, this is an efficient and compact design thanks to its patented self-modulating feature. The manufacturers claim it has enough power for 2 running showers at the same time so it is a great monthly expense saver for small families.
Pros
- Compact and efficient
- Precise temperature control
- Digital temperature display
Cons
- More suitable for colder regions
2. Stiebel Eltron DHC-E Single/Multi-Point-of-Use
Easiest Installation
| Dimensions | 4.1 x 7.9 x 14.2 in |
| KiloWatts | 9kW – 12kW |
| Voltage | 240 |
| Temperature Range | 86°F – 125°F |
This narrow design by Stiebel Eltron is easy to hide in most closets and under sinks and quick to install thanks to the simplicity of the parts. Don’t let the size fool you, it is still extremely efficient with a rated efficiency of 99% according to the manufacturer.
Adjusting the temperature is simple and straightforward thanks to the turning knob on the front. However, the temperature range is relatively limited compared to certain competitors.
One extra benefit is that Stiebel Eltron offers a 3-year warranty for its parts which cuts down your maintenance costs. This is also a sign that the brand stands behind its product for long-term use.
Another interesting feature is that is switchable between two different modes; 9000 watts and 12000 watts. This lets you alternate between a single point heater or multi-point-of-use.
Pros
- Switchable between single point and multi-point-of-use
- Simple design to install
- Narrow good looking design
Cons
- Small temperature range
- Turning knob is less precise than a digital display
3. Rheem Professional Classic Series RTEX-18 Heating Chambers
Best Warranty
| Dimensions | 4 x 15 x 19 in |
| KiloWatts | 18kW |
| Voltage | 240 |
| Temperature Range | 80°F – 140°F |
The Rheem Professional Classic Series receives lots of positive reviews online because it offers precision and efficiency. The RTEX-18 is their smallest whole-house model with a flow rate of 4.4 gallons per minute.
This version is self-modulating, meaning that it automatically adjusts the power consumption to the desired temperature and amount of water flowing through. Each casing contains two copper heating elements for quicker heating.
A big bonus point for this design is that the heating elements are replaceable. Rheem even gives you a 1-year limited warranty on spare parts and adds a 5-year limited warranty on top of that.
This Rheem electric tankless hot water heater is suitable for both a single point or multiple points. Reviewers state that it holds enough capacity for 2 showers and 2 faucets, at the same time.
Pros
- High capacity
- Long warranty
- Suitable for both single-point and multi-point
- Replaceable heating elements
- Self-modulating
Cons
- Common internal part failure
- Some reviewers report a temperature drop with simultaneous use
4. Titan SCR2 N120 Tankless Electric Water Heaters
Best Budget Buy
| Dimensions | 12 x 10 x 5 in |
| KiloWatts | 11.8kW |
| Voltage | 240 |
| Temperature Range | 105°F – 120°F |
This may not be the most beautiful design but it is a great option for when you are on a budget. Plus, it has several interesting specs that you won’t find on more expensive models.
This on demand water heater electric is very efficient with a rating of 99.5% and a maximum flow rate of 4 gallons per minute. It is also simple enough to install and has an extremely long warranty of 10 years for its water-carrying spare parts.
Now for the downside of this low-cost option. This version is only suitable for small households in warmer climates (i.e. the Southern United States) because it has a minimum inlet water temperature of 65°F.
On top of that, the lower temperature limit is as high as 105°F. So, this is not a good choice for more mild and colder climates because of its limitations in temperature but it is still an efficient and affordable water heater for hot climates.
Pros
- Affordable price
- Long warranty
- Easy installation
Cons
- High starting temperature
- Only suitable for inlet water temperature of 65°F and above.
5. Eemax EEM24018 Blue Electric Tankless
High Efficiency for Compact Model
| Dimensions | 17 x 14 x 3.8 in |
| KiloWatts | 18kW |
| Voltage | 240 |
| Temperature Range | 80°F – 140°F |
This cool blue color lets you hide this water heater in plain sight but it is still compact enough to stash away under the sink or service closet. Eemax offers a simple but reliable tankless electric water heater model that is suitable for both warmer and colder climates.
This model has a digital temperature display that lets you adjust by 1°F increments for water temperatures between 80°F and 140°F. You adjust the desired temperature via the turning knob which is a comfortable simple alternative to lots of buttons.
Eemax claims that the EEM24018 holds enough power for hot water in up to 4 showers when in warm climates and 1 shower plus 2 sinks in colder climates. So, this is a good option for large households in the Southern States and for a single person or couple in the colder Northern States.
The warranty for this product is also good. Eemax offers a 5-year limited warranty and a 1-year warranty for the parts.
Pros
- Long warranty
- Good temperature range
- Suitable for all climates
- Precise temperature control
Cons
- Sensitive to flow rates
- Warranty does not cover repair services
6. Bosch Tronic 6000C for Whole House
Best for Quick Heating
| Dimensions | 15.5 x 4.5 x 12.5 in |
| KiloWatts | 26.9kW |
| Voltage | 240 |
| Temperature Range | Up to 158°F |
Bosch is a big name in household appliances which is why this whole house water heater remains a popular choice. This is their larger version in the Tronic 600C Series with a power capacity of nearly 27 kilowatts.
Their larger model is powerful enough for endless hot water when using only 1 major household appliance like the shower. For a limited amount of time, this version can also provide heat to up to 3 water appliances.
Bosch delivers at 3.3 gallons per minute with a 55°F temperature increase. However, several reviewers claim that there is a significant waiting time for the water to actually heat up.
Once the device does reach the desired temperature, the built-in flow sensor ensures that the output is steady at a consistent temperature. It is an efficient model, but compared to many alternatives on this list it ranks slightly lower with an efficiency rating of 97%.
Pros
- Extremely big temperature range
- Consistent temperature output
- Suitable for both commercial and residential buildings
Cons
- Long time to heat up
- High service and repair costs
7. Marey Eco110 Self-Modulating
Best for US Southern States
| Dimensions | 3.1 x 7.5 x 10.8 in |
| KiloWatts | 11kW |
| Voltage | 240 |
| Temperature Range | N.a. |
The Marey Eco110 is specifically designed for warm climates since it has a minimum inlet water temperature of 70°F. In theory, you can still use this small tankless water heater electric in colder climates but in those situations, it is better reserved for a sink.
This self-modulating design has an LCD control panel for monitoring and controlling the water temperature. It is a very efficient model with the manufacturer quoting increased efficiency of up to 60% when compared to tank water heaters.
The Marey Eco110 is one of the smallest electric tankless water heaters on our top 10 list and this shows especially in the power requirements of just 11 kilowatts. Nonetheless, it offers a decent flow rate and 98% efficiency which Marey states lasts throughout its entire lifespan.
Pros
- Very small size
- Low power requirement
- Affordable
Cons
- Complicated installation i.e. must be done by professionals
- Unsatisfactory customer service
8. EcoTouch Point-of-Use Hot Water with Digital Display
Best for Under Sinks
| Dimensions | 11 x 7.5 x 2.35 in |
| KiloWatts | 5.5kW |
| Voltage | 240 |
| Temperature Range | 67°F – 109°F |
The compact dimensions of tankless electric water heaters offer a great solution for under sinks. Take for example this EcoTouch point-of-use model that fits perfectly under even the tightest sink cabinet spaces.
Despite its small size, this EcoTouch design does not lack in digital technology, even when compared to more expensive competitors. It has a digital control panel for temperature control and has a smart self-adjustment system that reacts to the exact flow rate in real-time.
This model was specifically designed to be used under a sink, with the black version even including a remote control so you don’t have to bow down to find the touch panel. The water temperature for sinks does not cover as big a range but with 67°F – 109°F it covers all the basic hot water requirements for in the sink.
Pros
- Perfect for under sinks
- Wide temperature range for power requirement
- Digital control panel with remote control possible
- Easy installation
Cons
- Single point-of-use
- Low flow rate
9. Stiebel Eltron Tempra Plus with Self-Modulating Power Technology
Most Consistent Temperature Output
| Dimensions | 16.5 x 4.6 x 14.5 in |
| KiloWatts | 28.8kW |
| Voltage | 240 |
| Temperature Range | 86°F – 140°F |
Another Stiebel Eltron model worth mentioning is their Tempra Series whole house water heater. It is a very efficient model that holds enough power to provide up to 2 showers and a sink hot water simultaneously.
On top of that, it is a very sleek gray design that blends into your background. It has a very quiet operation so you won’t even notice that it is running in the background.
Each model contains solid copper heating chambers and a digital control panel. There are different sizes available so check which version is most suitable for your area.
Pros
- Sleek design
- Good for households
- Silent
Cons
- Higher price
10. Rheem RTEX-13 Residential Heating Chamber
Most Unique Design
| Dimensions | 4 x 9 x 13 in |
| KiloWatts | 13kW |
| Voltage | 240 |
| Temperature Range | 80°F – 140°F |
The final place on our top 10 electric tankless water heater reviews goes to another Rheem model, the RTEX-13. This is a smaller version of the same series as the RTEX-18 with all the same benefits in a more compact design.
This rounded edge design has a digital temperature display with a turning knob for adjusting the temperature in 1°F increments. Inside are 2 copper heating elements that are replaceable which prolongs the lifespan of this product.
Installation is simple and you can choose to install it yourself if you are handy. It is also an extremely efficient model with an efficiency rating of 99.8% according to Rheem.
Pros
- Small size for capabilities
- Extremely efficient
- Cool design
Cons
- Low capacity
- Less suitable for colder climates
