The Best Electric Tankless Water Heaters That Won’t Run Out

Researched & Written by Craig

Oh no, I’m out of hot water again! Gotta get up early next time, or everyone else would use up everything in the tank.

Ever found yourself in that kind of trouble? Then you should probably go tankless.

In this post we’ve covered the best electric tankless water heaters available.

Including comparison tables highlighting their flow rates for different temperature demands.

After the reviews, you’ll also learn:

  • How an Electric Tankless Water Heater Works
  • The Pros & Cons of Electric Tankless Water Heaters
  • How to Understand Your Inlet Water Temperature
  • How to Know the Power You Need In Your Water Heater

Ready to find an amazing new water heater?

Then let’s dive right in.

Best Electric Tankless Water Heaters: Overview

Image Heater Award Power Options Link
ECOTOUCH Electric Best Small Model 5.5-9kW Amazon
Camplux Electric Best With Remote 11-27kW Amazon
Eemax EEM24013 Best for Looks 12-36kW Amazon
Stiebel Eltron Range Best Overall 13-36kW Amazon

Detailed Reviews of the Best Models

Best Overall Electric Water Heater

Stiebel Eltron Tankless Water Heater

Stiebel Eltron Tankless Water Heater
Great heating capacity at the right price.

This Stiebel Eltron Tempra 29 Plus is my top favorite on this list. It has everything you’d like to find in an electric tankless water heater.

Ease of use. High capacity. Consistent temperature. Energy savings. Silent operation. And of course, a sleek, modern design.

The Tempra model itself may have a lot of variants. But this ’29 Plus’ version strikes the right balance between capacity and price. The best part is how it helps lower your energy costs while giving you hot water on demand.

The number ‘29’ here, by the way, refers to 29 kW (kiloWatts) of power — the maximum amount it draws from your line.

Say you have a 4-bedroom, 2-shower-room, 2100-square-feet house. With this water heater on, you could keep your bath time totally relaxing and warm.

Your Inlet Water Temperature Required Temperature Rise

(for Target Hot Water Temp: 105°F)

Flow Rate

(Gallons per Minute)

42°F 63°F 3.1 GPM
52°F 53°F 3.7 GPM
62°F 43°F 4.6 GPM
72°F 33°F 6.0 GPM
Pros Cons
Maintains Consistent TemperatureMay Need Professional Help When Installing
Pre-Set Temperature Buttons
Silent Operation
Low Energy Consumption
Sleek Design with Digital Displays

Our Verdict

The Tempra 36 Plus is more powerful, while the Tempra 24 Plus is cheaper.

And if you want something in between, then go for the 29 Plus.

Of course, everything depends on your own water heating demands. In any case, feel free to check out the Tempra variants using the link below.

Best Electric Tankless Water Heater For Looks

Eemax EEM24013 Electric Tankless Water Heater

Eemax EEM24013 Electric Tankless Water Heater
Perfect for a small, cosy living space.

Okay, the Tempra looks pretty cool, but this Eemax EEM24013 just took the title right off the bat.

If you love blue so much (I may be biased toward it), then take advantage of this great heater right here.

Of course, I won’t even think about it if this water heater is all design and nothing more. It’s actually also pretty affordable, has sleek controls, and is excellent for small homes or condos.

That said, this particular variant only uses up to 13 kW of power, so you can’t expect it to beat the Tempra 29 Plus in terms of capacity.

Still, if you live somewhere warm, it can give you hot water for one shower and one sink at the same time. If the climate is colder, use just one fixture at a time.

 

Your Inlet Water Temperature

Required Temperature Rise

(for Target Hot Water Temp: 105°F)

Flow Rate

(Gallons per Minute)

42°F

63°F

1.4 GPM

52°F

53°F

1.7 GPM

62°F

43°F

2.1 GPM

72°F

33°F

2.7 GPM

Pros Cons
Modern Design, Display, and ControlsNot Recommended for Big Homes (See the Other Variants, Though)
Energy-Saving, Self-Modulating Feature
Instant Hot Water
Affordable

Our Verdict

I think the Eemax EEM24013 is excellent, just for small spaces. And if you live alone!

But if you have bigger heating demands, it might be best to go over its ‘cousins.’

You should be able to see these other models down the page as you check out the link below.

(Or, wait till we’re done reviewing two more water heaters after this one.)

Best Electric Tankless Heater With Remote

Camplux Electric Tankless Water Heater

Camplux Electric Tankless Water Heater
Fill your tub with hot water. Do so from a distance.

Camplux has done a great job in making a remote-controlled tankless water heater. This particular TE18 model eats up to only 18 kW while giving you hot water in a snap — wherever you install it.

Even if you don’t consider its remote, the Camplux TE (Tankless Electric? I guess) Series already has a great chance of beating the others up here. (Which is precisely why I added it in my best four!)

Consider, for example, how you can angle this water heater in many ways — even rotate it 360 degrees.

The benefit? You can mount it safely in the kitchen, above your bathtub or shower, or near or under the sink. You can even use it in a hair salon.

It also has other safety features like leakage proofing. Plus an overheat protection in case the temp reaches 153°F.

Add in the minimal design, black finish, smart touch controls, and LED display.

Want to save on energy? Then get one for each fixture, and place the unit close to the outlet.

Now for the sake of comparison:

Your Inlet Water Temperature

Required Temperature Rise

(for Target Hot Water Temp: 105°F)

Flow Rate

(Gallons per Minute)

Camplux TE18

Camplux TE27*

Tempra 29 Plus

42°F

63°F

1.95 GPM

2.93 GPM

3.1 GPM

52°F

53°F

2.32 GPM

3.48 GPM

3.7 GPM

62°F

43°F

2.86 GPM

4.29 GPM

4.6 GPM

72°F

33°F

3.73 GPM

5.59 GPM

6.0 GPM

*The TE27 variant uses up to 27 kW.

Pros Cons
Modern Touch Control and Digital DisplayMay Require A Professional/Licensed Technician to Install
Smart Remote Controller Included
Provides Hot Water in Seconds
Flexible 360° Multi-Angle Installation Options

Our Verdict

The Camplux TE18 model owns the sweet spot between the TE11 (11 kW) and the TE27 (27 kW). They all function the same way and only differ in power.

If you have similar heating needs that fit the Tempra 29 Plus above — but would need a remote — then you might as well consider the Camplux TE27.

What do you really prefer? Modern controls (plus extra features) or a higher power (and more hot water flow)?

Best Small Electric Tankless Water Heater

ECOTOUCH Electric Tankless Water Heater

ECOTOUCH Electric Tankless Water Heater
Meant for your dishwashers, washing machines, and sinks.

Living solo or think you only have super small water heating needs? Then this ECOTOUCH 9 kW unit could be your best bet.

Well… you can actually have this one too on a bigger house. Just install and use it in one specific area. In the kitchen, right under the sink, perhaps.

The key is to use it exclusively for that particular area.

Notice how small its flow rate is in the table below. Its 1 GPM flow can only cater to one faucet. And your standard showerhead usually takes at least 2 GPM on full blast.

Anyway, this ECOTOUCH water heater still took a spot in my list — all because it’s packed with great features.

Black, sleek design. Auto-adjust, self-modulating power input (max: 9 kW). Over-voltage protection. And easy touch controls.

Your Inlet Water Temperature

Required Temperature Rise

(for Target Hot Water Temp: 105°F)

Flow Rate

(Gallons per Minute)

ECOTOUCH

(9kW)

Eemax EEM24013 (13kW)

42°F

63°F

1.0 GPM

1.4 GPM

52°F

53°F

1.2 GPM

1.7 GPM

62°F

43°F

1.4 GPM

2.1 GPM

72°F

33°F

1.6 GPM

2.7 GPM

Pros Cons
Easy-to-Use Touch ControlsOnly Suitable for Low Hot Water Demands
Cost-Saving, Self-Modulating Power Input
Energy Efficiency at 99.8%
Leakage and Over-Temperature Protection

Our Verdict

Among the four water heaters here, this ECOTOUCH 9 kW unit gives you the lowest hot water flow rate. And yet, I couldn’t just forget about it. After all, it functions well according to its specs. Plus, it has all those protective and modern features.

My advice: get this for what it’s designed for. That is, with sinks, dishwashers, or washing machines. Or if you live within the warmer, southern areas, where your inlet water temp is at least 72°F.

How Does an Electric Tankless Water Heater Work?’

Overall, tankless water heaters only heat water on demand. They give you hot water just when you need it.

And… an electric-powered tankless water heater does that through its electric heating element. The heater:

  • Works through a heat exchanger.
  • Kicks off when it senses water flow (when you turn the shower or tap on).
  • Heats the incoming groundwater through its heating elements.
  • Gives you hot water at your desired
  • Doesn’t run out of hot water — it’s not storing water in a tank. It heats the water that flows through it!

Think you might need an electric tankless water heater at home?

The following table gives you an overview of the top electric tankless models I’ve found in the market.

(By the way, if you’re not sure how to pick the one that’s best for your heating demands, don’t worry. I have a detailed review and a quick guide right after the table. Read on.)

Pros & Cons of Electric Tankless Water Heaters

Using electric tankless water heaters gives many benefits. But they might not be suitable for some households. Let me summarize the pros and cons.

Pros:

  • Instant, on-demand hot water. You need not wait for a tank to be filled up.
  • Longer lifespan. That is, compared to tanked models.
  • Lower monthly bills. No huge energy losses (or “standby losses”), unlike tanked units that reheat the water repeatedly.
  • Space-saving. No tank, no space-hogging!

Cons:

  • Higher initial cost. A traditional tanked model is usually cheaper. (Although many electric tankless models are more affordable than gas-powered)
  • May not cater to simultaneous usage. An electric tankless water heater gives you a steady stream of hot water as long as there’s water input. But, depending on its capacity, it may not handle too many demands at the same time.This is why it’s so important to learn how to size your tankless water heater.

Understanding Inlet Water Temperature

The inlet water temperature simply refers to the temp of the water that’s coming from your main source and goes into your water heater. We also call this the groundwater temperature.

(Although there might be a slight difference between the actual water temp underground and the temp of the water that reaches your faucet.)

Anyway, let’s stick to the term input or inlet water temperature for now. This can be as low as 45° Fahrenheit or as high as 77° F — depending on where you live. (But 77° isn’t really high.)

Now, this temp is the baseline temperature that your water heater needs to work on. If you live in a place where the inlet water temp is 50° F, and you want a nice, hot shower at 120° F, then your water heater needs to raise the temp plus 70 degrees.

Quick math: 120° – 50° = 70 degrees.

This “70 degrees” is the temperature rise. (Remember the specs in the heater models above?)

What does this mean for you?

If your inlet water temp is a bit low, your water heater has to work harder. (That is, to answer your heating demand.)

And if you don’t wish to abuse your unit, you need to pick the model with the right specs (i.e., the right size or the right power).

What Power Do You Need?

As you might have noticed, a water heater that consumes higher power (kW) usually provides a greater flow rate (in gallons per minute or GPM).

What does this mean?

If there’s six or more of you at home, and you’re using hot water at the same time (think: 2 showers, 3 sinks, 1 tub), then you need a higher power.

Your water heater’s specs should include the power rating, and a 29 to 36 kW rating should be enough for huge households.

But if you really want maximum hot water flow, then avoid using your fixtures all at once.

Better yet, install several point-of-use electric tankless water heaters in your home. Get one small-capacity water heater for each area. One in the kitchen, one in the shower, and one in… anywhere else you’ll need it!

After all, tankless electric water heaters are easy to power up. Once installed, it’s just plug-and-play — but even more like tap-and-play. And many of them only use up energy when needed.

So don’t hesitate to invest in more than one unit.

Conclusion

We’ve just reviewed the 4 best electric tankless water heaters. Each one works great and answers the needs of different people.

With everything we’ve discussed, I hope I’ve helped you make your perfect choice.

Need more info? Read this if you want to learn more about sizing a tankless water heater. Or this, if you wish to make your water heater last longer — whether it’s tanked or tankless.

But if you think you’ve already made up your mind, then go ahead and scroll up to your best pick.

Thanks, and have a great day!

– Craig