Ecosmart ECO 18 Electric Tankless Water Heater Review



The Ecosmart ECO 18 is a reputed electric tankless water heater from the makers of some of the best water heater models in the world. While new brands continue to push their versions of high end tankless water heaters, not many are able to match the performance and cost effectiveness that Ecosmart has to offer.

This ‘whole home’ water heater is ideal for cold climates and can produce 2.5 gallons of hot water per minute. In other words, you can use a shower and a sink with incoming water at 62°F. It can also run two showers simultaneously, but the output temperature will drop from 105°F to around 70°F. Overall, the Ecosmart ECO18 electric tankless water heater has been received well, but we will let you be the judge after going through its features.

Important Features and Specs

The Ecosmart ECO 18 electric Tankless water heater has many features that make it an ideal water heater for domestic use. It uses a self modulating technology to ensure that users are served with continuous hot water. The technology configures and then modulates water temperature as required, and helps in reducing heating bills in the long run. In fact, the ECO 18 water heater can bring down your water heating bills by a remarkable 60%.

The Smart Technology in the Ecosmart tankless water heater series has been received well by users and market analysts. The user doesn’t have to worry about adjusting water heater temperature manually whenever it goes up or down. It’s configured specifically for climate conditions where hot water becomes a necessity. In the hotter parts of the world, this feature becomes really useful as it further reduces the monthly energy bills consumed by heating water.

The Ecosmart ECO 18 water heater features a digital temperature control that allows the users to increase or decrease the temperature by 1 degree increments. Its compact size makes it useful in almost every area of a home, and can save up to 12 cubic feet of your storage space. And it’s not just the compact size that has impressed many homeowners, as the ECO 18 water heater is quite easy to install and use.

All you have to do is follow the instruction manual, get a 150 amp minimum electric panel, and 40 amp double poke breakers that are connected to two sets of #8 awg wire. If you are having trouble setting up the ECO 18, then call in a plumber and you’ll get the job done within an hour.


  • Compact size and highly portable.
  • Easy to install and use.
  • Delivers continuous hot water in multiple taps.
  • Can save up to 60% on your water heating energy bills.
  • High end body materials for durability.
  • Ideal for small homes and comes with lifetime residential warranty.


  • Not as cost effective as other models from competitors.
  • Not practical for large homes, or homes where more hot water is used.
  • Some users have complained that the water heater is too small to accept the #8 awg wire.

Who Should Buy

The Ecosmart ECO 18 electric tankless water heater is definitely one of the high end water heaters available in the tankless market. That being said, it’s not a product that can be used universally because that would only compromise its features. The ECO 18 water heater is ideal for small homes or residential units with 3 to 4 people. This will give all the users adequate hot water supply for showers, washing dishes, and other things.

Since it’s made for residential units, this automatically disqualifies the ECO 18 water heater for commercial uses, unless of course it is used in the kitchens to provide hot water supply to sinks. If you live in a large home where you have an existing water heater, then the ECO 18 will definitely compliment it as a side unit. For example, if you have a water heater reserved for showers, then you can use the ECO 18 on sinks, or on a separate shower in one of the bedrooms. While the market for the ECO 18 water heater is there, it is however limited.


Ecosmart has been, for long, considered the frontrunner of the tankless water heater market along with Bosch. The Ecosmart ECO 18 definitely lives up to its bill as energy efficient water heater that is geared towards performance and ease of use. While it may not be able to compete with other tankless water heaters in terms of price, but when it comes to reducing energy bills in the long haul, not many match the flexibility that ECO 18 has to offer.

Overall, the Ecosmart ECO 18 electric tankless water heater is another top drawer model from the renowned makers. It is compact, energy efficient, and it’s made for performance.