Ecosmart Tankless Water Heaters: Reviews of Different Models

Tankless water heaters are an excellent choice for many homeowners, especially those who want to reduce their energy consumption. Some Ecosmart tankless water heaters are made for residential use while others can be used in commercial settings like hotels or restaurants.  Ecosmart tankless water heaters also come in a variety of sizes to suit the needs of just about anyone. 

Ecosmart Tankless Water Heaters Reviews

Ecosmart Company

Eemax Ecosmart is a renowned manufacturer of tankless water heaters. They are providing smart water heating solutions to serve commercial, industrial and residential appliances in the United States.

EcoSmart is the production of Eemax specifically designed to manufacture tankless models with the latest and smart technologies. Later on, Eemax also integrated with Rheem to enhance the quality of the tankless heaters

Ecosmart tankless water heaters are some of the best on the market today. They provide energy-efficient hot water at any time without waiting for a storage tank to fill up. Whether you’re taking a quick shower or filling your dishwasher, Ecosmart has got you covered with this handy device!

EcoSmart has advanced water heaters that are energy-efficient. The patented flow sensor technology allows customers to consume less hot water, which helps them save money on their electric bills. 

Types Of EcoSmart Tankless Water Heaters

EcoSmart’s heaters are both electric and gas, depending on what you need. For an affordable price, they provide high-quality heating that is energy efficient. Eco Smart offers low flow point of use units for around $150 or whole house installations which cost up to about $1 600 (before installation).

Electric heaters from EcoSmart are a great choice if you want to save money on your energy bills. Electric units cost as little as $150 for low-flow, point of use models and can go up in price all the way up to around $725 before tankless installation depending upon what type of heater is chosen (indoor or outdoor) AND how many rooms will have this unit installed within them! Gas hot water tanks range between 700-$1 600 but when compared with an electric heater they seem kind of expensive at first glance because there are no monthly fees associated w/a gas. 

EcoSmart Tankless Water Heater Parts & Specs

I am going to give you a brief introduction to important parts of tankless water heaters. Additionally, I will highlight some specs as well. 

Heat Exchangers And Elements

A heat exchanger or element is used to heat up water. Water is heated by the elements, while the exchangers keep the elements enclosed. 

EcoSmart electric tankless water heaters are made of stainless steel and copper. In order to prevent electrolysis, these elements feature brass tops that install easily inside or outside. 

Temperature Control

Ecosmart tankless water heaters offer various temperature control features to ensure the desired temperature. They come with a digital display showing the outlet temperature.

There is a temperature range between 80°F and 140°F with increments of 1ºF giving you the ultimate peace of mind. You only need to set your desired temperature once, and you’ll have hot water whenever you need it.

Patented Self-Modulating Technology

Patented Self Modulating Technology means the unit will activate and control its own energy consumption to suit your needs. All EcoSmart electric tankless water heaters use a patented self-regulating technology that activates at .25 GPM, with exceptions being made for POU models.

Thus, they will never waste more energy than necessary, even when your household is doing its typical loads of dishes or laundry. 


When it comes to the design of Ecosmart tankless models, it is simple and easy to use. The integration of different features in a simple way enhances the functionality of the unit. Manual resetting of the thermostat is truly a tension, thanks to the automatic resettable thermostat feature making life easy. 

EcoSmart Water Heater Problems

Have problems with your EcoSmart Water Heater? This article can help you to get rid of those problems. Here are some instructions on how to fix your EcoSmart Water Heater. You’ll learn about common problems, get tips, and find out how to interpret the error codes for your model’s EcoSmart water heater.

Water Is Warm But Not Hot

If you are having trouble heating your water, there could be many reasons such as:

  • you might have an undersized Tankless model
  • cross-connected hot and cold water pipes
  • a malfunctioning heater or thermostat

Solutions For Hot Water

  • Determine the need of hot water for your family then buy the tankless model accordingly. 
  • Cross connections can easily be checked by turning the hot water appliance on and turning off the water supply. If the water continues to flow, this indicates a crossed connection.
  • Furthermore, we recommend that you contact a professional to inspect the thermostat or heating elements on the water heater to get them fixed.

Leaks in EcoSmart Tankless Water Heater

Verify that there are no obvious leaks in the plumbing system due to a loose connection. Tight them if found. You should also check and tighten any loose parts of the heating element. If you still notice leaks from the element, it’s likely that the gasket needs to be replaced. 

How To Fix EcoSmart Water Heater Errors

It is advisable to know about the EcoSmart error codes and how to remove them. Below are some common error codes. Let’s explore them in detail. 

E1: Error Code

If you see the E1 error code on your EcoSmart tankless water heater, there is a thermistor error. It indicates that your thermistor is unable to read the accurate temperature. 

Following these steps will help you resolve an E1 error:

  • The LED screen will display E1 error as it is turned on.
  • For three to five seconds, hold down the round knob.
  • A CE1 appears in the LED display after the knob is released.
  • For two or three minutes, keep the water running.
  • Make sure you have access to hot water.

E2: Error Code

E2 indicates the problem with the outlet thermistor. You may repeat the above-mentioned steps, but this time CE2 will appear on the screen. But there are less chances of fixing the error. The ultimate solution is to replace the outlet thermistor with the new one. 

E3: Error Code

The E3 error comes when there is an issue between both the inlet and outlet thermistor simultaneously. Sadly, you can troubleshoot this error temporarily. Following are the steps:

  • When you turn on the water, the E3 is seen on the LCD display. 
  • For about 3 or 5 minutes, press down the round knob.
  • A CE3 message will appear on the LED display after you release the knob.
  • For two or three minutes, keep the water running.
  • Verify that you are receiving hot water.

E4: Error Code

If an E4 error message is displayed, it indicates an issue in high temperature. A temperature of 150 degrees or more is detected in the incoming water line. Depending on the model, this heater comes equipped with two to four thermostats, each rated at 140 degrees. This heater cannot be heated above 140 F. You must lower the incoming water temperature below 140F if your control board displays this error code.

E5: Error Code

It is a high flow rate error. To troubleshoot this error, you must reduce the flow of water through the tankless model until the LED displays the desired temperature. To do so, you should install a flow restrictor or close the inlet or outlet valve. You may purchase flow restrictors from the company, online, or even any hardware stores easily. 

E103: Error Code

This error highlights low voltage problems. If you are seeing S103 error codes on your LED control board, there is incorrect power your tankless water heater is receiving. Remember, to operate properly, the heater needs 208 volts. The heater will begin heating as soon as it receives the correct power and the LED system displays the desired temperature.

Ecosmart Error Codes

EcoSmart Tankless Water Heater Reviews – Top Models

EcoSmart’s heaters are both electric and gas, depending on what you need. Electric water heaters are the top sellers in EcoSmart’s lineup. The gas counterparts however differ greatly from one another: while all have been tested compatible with both natural gas tankless heaters or propane tankless heaters

Let’s look at the reviews of different models in detail. 

Ecosmart ECO 18 Electric Tankless Water Heater

Ecosmart ECO 18 Electric Tankless Water Heater
  • 0. 3 GPM Activation flow
  • Save up to 60% on your water heating costs
  • Easy to use
  •  Highly durable

ECOSMART ECO 18 Electric Tankless Water Heater is an innovative water heating solution. It provides continuous hot water at a rate of 3. 5 gallons per minute, making it perfect for both residential and light commercial applications. 

The product has a digital temperature control in 1-degree increments to give users complete control. This tankless water heater can save up to 60% on your water heating costs and never run out of hot water with its self-modulating technology that adjusts power output based on the demand. 

The ECO 18 is a 75-amp tankless water heater that works with 2 X 40 AMP (DP) breakers and 2 X 8 AWG wire. The product is highly durable, easy to use and its power consumption is low. The product has a lifetime warranty for residential use and it comes in white color. This tankless model is highly durable, easy to use and its power consumption is low. 

EcoSmart ECO 11 Electric Tankless Water Heater 

EcoSmart ECO 11 Electric Tankless Water Heater
  • Consistent hot water 
  • 90% Smaller than traditional tank heaters
  •  99% Thermal energy efficient
  •  13-kilowatt tankless electric water heater 

The ECO 11 is an instant tankless electric water heater that provides hot water on demand. The unit is equipped with an energy-efficient and a temperature sensor to monitor the temperature of the incoming cold water and maintain it at a constant level. Therefore, you can enjoy hot showers and baths without worrying about running out of hot water. 

The ECO 11 features digital controls that allow you to select your desired temperature. You can choose from preset temperatures or set your own temperature between 80 degrees Fahrenheit and 140 degrees Fahrenheit. The unit will automatically configure its flow rate when the inlet water temperature is 67° and above. 

The EcoSmart ECO 11 is a tankless electric water heater designed to provide hot water for point-of-use or low-flow applications. This unit provides between 1.3 and 3.1 gallons per minute (GPM) depending on the inlet water temperature, making it an ideal solution for providing hot water for bathrooms, small sinks, office break rooms, and other similar applications. 

The ECO 11 offers the efficiency of a tankless system with the convenience of an electric heating element that can be installed almost anywhere without plumbing or gas lines. Although it is the best point of use tankless, it is not suitable when the hot water demand is high. 

Ecosmart POU 6 Point of Use Electric Tankless Water Heater

  • 0.5 GPM in warmer climates
  • Digital temperature control 80 – 140° F
  • Field replaceable elements
  •  Advanced self-modulating technology

Being a point-of-use tankless model, EcoSmart POU 6 tankless electric water heater recirculates hot water from a nearby water appliance, providing instant hot water when needed.  It is a compact electric water heater that provides hot water for one sink with a flow rate of 0.5 GPM in warmer climates and 0.25 GPM in colder climates. 

The POU 6 requires a 1 x 30 amp breaker and 10 AWG wires and is designed to be used with a single sink only. Do not use it with a shower or multiple fixtures as this will overload the unit and damage it beyond repair. 

It features self-modulation technology which means you only use the amount of energy needed to heat your water when you need it, saving you money on heating costs.

This innovative, wall-mounted water heater is up to 90% smaller than a tank and takes up less space. It is easy to install and maintain. Plus, it offers multiple installation options and can be placed anywhere in the house you need hot water: kitchen, laundry room, bathroom or even outdoors.

EcoSmart ECO 27 Electric Tankless Water Heater

ecosmart 27 electric tankless water heater
  • Savings of up to 50% on water heating costs
  • Digital temperature control in 1-degree increments
  •  0.3 GPM Activation Flow
  •  Copper and stainless components 

The EcoSmart ECO 27 Electric Tankless Water Heater is the perfect solution for residential or commercial applications. With a flow rate of 0.3 GPM, this unit provides hot water instantly on-demand, saving you up to 50% of your water heating costs. The patented self-modulating technology allows for precise temperature control, which means you can enjoy the perfect temperature every time, regardless of what other appliances are running in your home or business. 

With a maximum output of 27 KW at 240 Volts and 112 Amps, this unit is suitable for most household and light commercial applications. The digital temperature control allows you to easily adjust the temperature between 80 degrees F and 140 degrees F with 1-degree increments.

This unit features a stylish design that will add elegance to any bathroom or kitchen area. The unique design offers efficient operation and low energy consumption making it ideal for homes with limited space. 

 The EcoSmart ECO 27 features a stainless steel heat exchanger and copper internal components that are designed for efficiency, durability, safety, and easy replacement in the event of an emergency. 

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
  • Digital output temperature display
  • Sleek and compact design
  • 99.8-percent energy efficient
  •  Recommended for whole house

Ecosmart ECO 36 is an electric tankless water heater designed for residential use and commercial use. It has a sleek design with a digital display and an easy-to-operate interface. Though it may be slightly more expensive than its counterparts, this product does have many good features that make it worth buying in the long run, including its energy efficiency which can save homeowners money in the long term.

This is the perfect choice for northerners living in climates where temperatures can get as low at 37 degrees F. The high efficiency and capacity make this unit capable of handling up to 2 showers at once while never running out of hot water, which means you’ll be able to take longer baths or enjoy Roman-style showers without having any worries about plumbing issues shutting down your home’s functionality. With 6 gallons per minute (FGPM) available on-demand, it will also handle multiple applications with ease. 

The ECO 36 comes with an easy-to-read LED temperature display that allows homeowners to control the device and maintain safe temperatures easily. The ECO 36 uses 3/4-inch fittings that are compatible with most domestic plumbing systems. This saves homeowners the trouble of having to purchase new parts just for this device. 

Daniel Adley is a seasoned and skilled plumber with over 20 years of experience. Specializing in repairing and optimizing water appliances for large buildings, offices, and homes, he has a keen eye for efficiently identifying plumbing and maintenance issues. With a passion for his craft, Daniel brings extensive knowledge and expertise to every project, ensuring reliable and effective solutions for his clients.

Leave a Comment