EcoSmart ECO 11/ECO 18 Electric Tankless Water Heater Review

"The Smarter electric tankless water heater that comes with a lesser price tag"

If you're tired of bulky water tanks and sky-high energy bills, it may be time to switch to a tankless water heater. But how can you be sure which model is right for you?

How do you decide between gas and electric? How do you know when a price is fair?

I've tested a lot of tankless water heaters in my time, and in my professional opinion, EcoSmart is one of the best brands on the market.

Not only will their products save you time, money and energy, but they'll also supply you with unlimited hot water for all the showers, dishwashers and washing machines you could want.

But you don't have to take my word for it. Consider this your quick guide to EcoSmart ECO 11 and ECO 18 electric tankless water heaters.

EcoSmart ECO 11

EcoSmart ECO 18


The first thing you should know is that there are two major models to choose from:

Both are electric heating units, which means that they don't require flames and burners like natural gas models do, and installation doesn't involve complicated venting and exhaust systems. The ECO 11 and the ECO 18 also share a flow rate of 2-3 gallons per minute, which isn't the highest number in the industry but isn't the lowest either.

One of the best things about these models is their size. With even the biggest clocking in at less than 15 lbs, they can be fit just about anywhere in your home.

Stick them under the sink; hide them in your utility closet; mount them to the wall to free up floor space.

  • Also read: Ecosmart ECO 27 - Best All in All Tankless Water Heater ( If you have a higher budget,you can surely go for this model . This comes with a higher price tag but still worth it!)


A big selling point of these units is that they come with controls in one-degree increments. If you don't like your water too hot or too cold, the ECO 11 or 18 can be adjusted to your exact specifications.

Like all electric units, these models are best suited for smaller homes or those without extreme hot water demands. They lack the power to serve more than three or four taps at a time, so while they're fine for running the dishwasher while you hop in the bathtub, they can't take three teenagers needing showers in three separate bathrooms at the same time.

The ECO 11 is considered a "point of use" unit, meaning that it should be installed directly at the sink where you're looking for the fastest delivery of hot water.

The ECO 18 is called a "whole house" unit, meaning that one unit installed anywhere will serve the whole residence.

Heat Output and Flow

ECO 11 and 18s are self-modulating, meaning they detect the temperature and flow of incoming water without any action required by you. This is how they offer to-the-degree settings and controls; their sensors know when the water isn't at that specified temperature, and they fix it before it gushes from your sink or shower head.

As you might imagine, this process can take time, so be prepared for flow delays of 15-30 seconds. Users report that the delay shortens after the heating unit has been active for awhile.

As previously discussed, you'll enjoy between 2-3 gpm depending on the model.


Though it's much less complicated than other systems, you will need to have all parts and tools on hand before installing an EcoSmart product. This includes:

  • 125 amp electrical panel
  • 60 amp double pole breaker
  • Assorted wires and cables

You're given pressure fitting with your purchase, so don't worry about those. You can also order an optional 1/2" NPT adapter along with some models.

General Use

There are both pros and cons to buying an EcoSmart tankless water heater, so before you add it to your cart, consider every angle.


  • Small, discreet heating units that can be installed anywhere
  • One of the most affordable brands on the market
  • Easy installation
  • Precision temperature controls


  • Not suitable for larger homes
  • Not suitable for colder climates
  • Slight flow and pressure delays during simultaneous usage
  • Might require more than one unit

Customer Reviews

Customers love both the ECO 11 and the ECO 18. Between their temperature controls and their easy, no-hassle installation, they're popular units among buyers of tankless water heaters. They're often the first choice of those just making the switch from traditional water tanks, too.

As for the differences between models, you can use customer reviews to figure out whether the 11 or the 18 is the right choice for you:

  • The ECO 11 is reported to have slightly shorter flow delays (~15 seconds) compared to the ECO 18 (~30 seconds).
  • The ECO 11 can handle less simultaneous usage as the ECO 18.
  • The ECO 11 costs less money upfront, but the ECO 18 provides the most energy savings over time.

For getting even more reviews, take a quick look at to see what other customers are saying .

All in all, the ECO 11 is smaller and faster than the ECO 18, but it also delivers less power and is less energy-efficient.

When looking at these products, you'll need to ask yourself what you value more in terms of both daily use and long-term benefits.

What's the bottom line?

EcoSmart is a great brand to consider if you're looking for a simple water heater that will get the job done without fuss. Their products have just enough bells and whistles for customized use but lack anything truly high-tech or high-maintenance that might scare away first-time users.

I encourage everyone to check them out on Amazon for further information about specs, sizes and power outputs. Order today and you could be using an ECO 11 or  ECO 18 by the end of the week!

Also read:

Image credits: EcoSmart

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