EcoSmart tankless water heaters power home water heating for millions of homes across the country. Not only do they give you a reliable source of hot water, but help you to save electricity, save space, save time, and save money. Our in depth review covers the ECO 11 through ECO 27 electric tankless water heaters where the two numbers at the end indicate the volume (in gallons per minute) that the unit supplies.

From left to right: the EcoSmart ECO 11, EcoSmart ECO 18, and EcoSmart ECO 27 electric tankless water heaters. These provide 1.3, 1.8, and 2.7 GPM (gallons per minute) of instant-on hot water.

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EcoSmart provides a variety of flow rates for their ECO line of electric tankless water heaters. We take a look at the ECO 11 through ECO 27 below.

EcoSmart ECO 11

EcoSmart ECO 11 is amongst the most popular tankless electric water heaters currently available in the market. There are numerous features that make this heater exclusive such as the highly advanced self-modulating technology that helps in cutting energy costs to up to 60%. It is equipped with digital temperature control feature that offers 1-degree increment and provides the users full control over the water temperature. This is really a Smart heater that can be termed as perfect for the entire family especially for regions where temperature is above 67 degree F. It can heat up to 2 gallon/min and at a time you can run a shower and sink with 1.5 gpm flow at 105 degree F output setting. Thus, you may use it as a Point of Use application for sinks in very cold climatic conditions.

Pros

  • It comes with a lifetime warranty for domestic usage
  • Reduces water heating costs up to 60% with its advanced self-modulating technology
  • Compact size allows you to save at least 12 cubic feet of space over comparable units, making it an ideal choice for small homes and condos
  • Low price makes it an economical choice

Cons

  • Installation can be tricky for those having little or no familiarity with plumbing and electrical fittings
  • You need to install it correctly and make sure the distance between point of use and the heater is minimized and/or well insulated to maintain water temperature
  • Less efficient in extremely cold weather

Installation and Specifications

The ECO 11 is very easy to install through a DIY approach since the unit comes with a thoroughly drafted user manual explaining the mounting procedure in detail. To mount the heater you will require a 125 amp electrical panel along with (1) 60 amp double pole breaker attached to (1) set of #6 awg wire. For plumbing connection you will need 1/2inch compression fitting and optionally you can go for 1/2inch NPT adapter, which are included in the package.

SpecificationValue
Assembled Depth9.75″
Assembled Height12″
Assembled Width3.75″
Product Depth9.75″
Product Height12″
Product Width3.75″
Water Connection Size1/2 In. NPT adapter included
Amperage (amps)57
Electric Product TypeCommercial & Residential
Finish FamilyWhite
Flow Rate @ 35 F Rise (gallons/min)2.14 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)1.66 gal
Fuel TypeElectric
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.25
Minimum Temperature (F)80
Point-Of-UseNo
Product Weight (lb.)7 lb
Residential/Commercial/industrial UseResidential, commercial or industrial
ModelEcoSmart ECO 11
Voltage (volts)110
Water Connection LocationSide
Water Heater FeaturesOverheat Protection,Wall Mountable
Wattage (watts)11000

Common Problems

As is the case with all tankless water heaters, ECO11 also offers fluctuations in flow rate and temperatures. Therefore, if it is used in very cold weather where temperature is set at the highest then water turnover will be limited in terms of gallons per minute in comparison to the efficiency it offers in warmer weather conditions. However, if you have sized it appropriately then you can enjoy endless hot water supply without worrying about high energy consumption. You need to evaluate the right size of this heater before making the purchase considering your electrical requirements and frequency of hot water demand as well as family size.

Ideal Usage

This is a good buy for a single person living alone and even for a student with a one-bathroom apartment. It does not work efficiently for families who need more hot water flow in their homes. If used properly, it can save up to 60% on your energy bill. Also, considering its compact size, it can save you up to 12 cubic feet of space.

EcoSmart ECO 18

Ecosmart ECO 18 is a popular tankless electric heater and regarded as one of the best models in the market today. This is a new-age heater that can ensure an exceptional user experience. Just like all ECO models, this heater has a digital temperature control feature through which you can get up to 1-degree temperature increments. Some prominent features of this unit are:

  • Self-modulating technology ensures automatic water temperature adjustment according to demand
  • Reduces energy consumption and minimizes electricity bills to up to 60%
  • Compact and sleek design with 17x14x3.5inches dimensions
  • Life time warranty for residential users
  • EcoSmart technology heats water efficiently
  • Digital temperature controls offers complete control of water heating
  • Saves storage space up to 12 cubic feet

Pros

  • The unit is compact and can fit anywhere Installation is relatively easy and can be done with a little elbow grease
  • Can perform efficiently when outdoor temperature is above 62degree F
  • Unit can heat above 2.5gallons water per minute and can run two 1.5gpm showers simultaneously
  • Digital temperature control feature makes it possible for users to set temperatures in 1-degree increments

Cons

  • It is not very suitable for very cold regions because it offers limited supply of hot water in terms of gallons per minute

Installation and Specifications

You can install it yourself easily just like any tankless water heater. Since the unit is extremely compact therefore, you need not to worry about the space. It is ideal for small homes, condos, kitchens and offices. The user manual included in the package informs comprehensively about the process of installation. However, you may require additional wiring and piping especially if the wires that you currently have are plastic ones. Always use copper pipes for connecting water supply with this unit. You may require 80ft wiring for the unit’s two separate circuits. Remember to keep the two hot leads of every circuit away from each other and every double-pole circuit’s hot leads have to be paired up. For plumbing purposes use flexible water heater connectors of braided material and then connect them to CPVC. You will need at least 150amp electrical panel with two 40amp double pole-breakers linked to two sets of 8-gauge wire.

SpecificationValue
Assembled Depth14″
Assembled Height18″
Assembled Width4″
Product Depth14″
Product Height18″
Product Width4″
Water Connection Size3/4 In. NPT
Amperage (amps)75
Electric Product TypeCommercial & Residential
Finish FamilyWhite
Flow Rate @ 35 F Rise (gallons/min)3.5 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)2.72 gal
Fuel TypeElectric
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.25
Minimum Temperature (F)80
Point-Of-UseNo
Product Weight (lb.)11 lb
Residential/Commercial/industrial UseResidential, commercial or industrial
ModelEcosmart ECO 18
Water Connection LocationBottom
Water Heater FeaturesWall Mountable
Wattage (watts)18000

Common Problems

If you haven’t sized it properly then water supply will be limited and also in extremely cold regions the performance of the unit may get affected. Therefore before purchasing you need to select the right size by evaluating the size of family, expected hot water demand and electrical requirements. Technology-wise this heater is ideal choice but the installation cost may exceed your budget because the 2x40amp double pole breakers, 150amp electrical panel and a pair of 8awg wiring doesn’t come cheap.

Ideal Usage

In terms of its technology, it is a great choice for a water heater but installation can be quite costly as it requires a minimum 150 amp electrical panel with 2 x 40 amp double pole breakers connected to 2 set of 8 awg wire and that doesn’t come cheap as it also depends on how far you want your wiring to go. 3/4” NPT plumbing connections are also needed.

EcoSmart ECO 24

Ecosmart ECO 24 is one of the largest tankless water heater that runs on self-modulating technology. It offers an exceptionally refined and relaxing heating experience and high return on investment since you not just recover unit’s price within two months but also save a lot more on your electricity bill. It is a durable, reliable and highly advanced water heater. EcoSmart’s patent self-modulating technology lets it automatically adjusts the energy consumption according to the required temperature. This feature makes this unit highly economical and efficient. On the whole, it is 99.8% energy efficient, which is a feature found only in few electric tankless heaters in the market. It has an automatic resetting thermostat instead of manual one and the unit heats up to 3GPM of water, which proves its efficiency.

Pros

  • Saves up to 60% on your regular heating expenses
  • 99.8% energy efficiency due to its heat exchangers
  • All elements are serviceable, durable and replaceable
  • Unit comes with a lifetime warranty
  • EcoSmart’s self-modulating technology ensures quick and adequate hot water supply
  • You can set temperature in 1-degree increments with digital temperature control feature
  • Thermostat resets automatically
  • Provides 2.4 GPM hot water
  • You can easily fulfil hot water supply of Jacuzzis and bath tubs that demand sufficient hot water at regular basis

Cons

  • It is expensive in comparison to the regular boiler heaters
  • The unit can’t store hot water and warms water when it reaches you which increases the likelihood of col sandwich effect
  • Installation can prove to be expensive due to additional wiring and electrical equipment requirement

Installation and Specifications

ECO24 components are made from stainless steel and copper. All of its components are durable and can be replaced easily. The unit is fairly easy to install and designed for providing endless hot water supply to medium sized families.  You will require three 40amp breakers in addition to the included 24KW 240V breakers. The unit comes with EcoSmart’s comprehensive user manual containing step-by-step instructions on installation. However, one aspect that you need to remember before installing is to evaluate the required wiring and electrical specifications. The unit performs efficiently if it is properly installed therefore we suggest that you hire a professional electrician to do the job. Before purchasing, you also must check out the temperature chart to verify which model will best suit your needs and will comply with outside weather.

SpecificationValue
Assembled Depth17″
Assembled Height18″
Assembled Width4″
Product Depth17″
Product Height18″
Product Width4″
Water Connection Size3/4 In. NPT
Amperage (amps)100
Electric Product TypeCommercial & Residential
Finish FamilyWhite
Flow Rate @ 35 F Rise (gallons/min)4.64 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)3.63 gal
Fuel TypeElectric
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.25
Minimum Temperature (F)80
Point-Of-UseNo
Product Weight (lb.)14 lb
Residential/Commercial/industrial UseResidential, commercial or industrial
ModelEcosmart ECO 24
Water Connection LocationBottom
Water Heater FeaturesWall Mountable
Wattage (watts)24000

Common Problems

The only problem this unit has is the intricate and somewhat tricky installation and mounting procedure. You need to create two new holes at the lower end of the unit to accommodate the EMT connectors since the provided hole and wire clamp are pretty narrow. However, considering that the unit has been specially designed for extremely cold weathers and is appropriate for medium families makes it very feasible choice for indoor usage.

Ideal Usage

All in all, the product is unique in its technology. The EcoSmart ECO 24 is just another step towards smart water heaters after smartphones. With its innovative ways of heating water, the product is truly a masterpiece and is hard to resist. Although there are missing gaps, the tankless water heater technology is still in its infancy and this means it is still a better device than other heaters out there. The EcoSmart ECO 24 is not simply a water heater; it is something of luxury that you can show off with!! Finally, there is a water heater that is actually “cool”.

EcoSmart ECO 27

Ecosmart ECO 27 is the best available electric tankless heater in the market today that is equipped with self-modulating technology. With a size as compact as 17x17x3.5inches you surely can secure at least 12cubic feet of storage space. The features of this unit are as follows:

  • Domestic users can benefit from a life time warranty on this unit
  • Reduces up to 60% of your normal water heating costs through its advanced, self-modulating technology
  • This ECOSMART tankless water heater never runs out of hot water
  • Contains digital temperature control system offering 1-degree increment

This unit can easily supply high demand of hot water because capacity wise this is the largest model in the market. This smart self-modulating tankless unit is ideal for extremely dry and cold regions because it can heat water efficiently when outside temperature is as low as 37degrees F. You can easily use it on your roman-style or Jacuzzi tubs and kitchen areas because it is a multi-purpose unit.

Pros

  • Supplies up to 2.7 GPM of hot water per minute in extremely cold weather and 6gallons per minute on regular days
  • Efficient in all sorts of weather
  • Energy efficient because it contains highly advanced self-modulating system, which means it adjusts electricity requirement according to the demand and flow of water
  • Can perform the job of two heaters
  • Users can enjoy full control over hot water temperature through its digital temperature control that offers 1 degree increments
  • Suitable for small or large families
  • Digital display makes temperature setting easier
  • Sleek and attractive design

Cons

  • Initially the unit may not supply hot water as per the temperature but gradually water supply stabilizes
  • Extra wiring and additional components are required for installing the unit
  • To ensure smooth functioning you may need to upgrade it with support systems and pole breakers

Installation and Specifications

This 27KW/240V unit has three separate 9KW heaters operating sequentially and as per user demand. Each unit requires a separate 40amps/240v circuit and 8-gauge wire. Installing this heater is exceptionally simple and easy. You can mount it anywhere provided that the previous plumbing connections are with copper pipe else you will have to modify them. The product comes with a comprehensive step-by-step guide for installing it personally. However, you can seek professional help if you are not familiar with electrical wiring and installations.

SpecificationValue
Assembled Depth17″
Assembled Height18″
Assembled Width4″
Product Depth17″
Product Height18″
Product Width4″
Water Connection Size3/4 In. NPT
Amperage (amps)112.5
Electric Product TypeCommercial & Residential
Finish FamilyWhite
Flow Rate @ 35 F Rise (gallons/min)5.25 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)4.08 gal
Fuel TypeElectric
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.25
Minimum Temperature (F)80
Point-Of-UseNo
Product Weight (lb.)14 lb
Residential/Commercial/industrial UseResidential, commercial or industrial
ModelEcosmart ECO 27
Water Connection LocationBottom
Water Heater FeaturesWall Mountable
Wattage (watts)27000

Common Problems

One problem that usually occurs is prompted by the 3 copper pipes that serve as heat exchangers. These pose some restriction in water flow. Some users face the issue of dribbling water but this is a problem caused by uncleansed pipes. When you clean the pipes, water will stop dribbling. However, this is one of the best and most energy efficient models currently available especially for domestic use. If you can ignore the high installation cost due to requirement of extra components then this unit is ideal for personal usage.

Ideal Usage

The ECO 27 is one of the best models you can get for residential use where hot water consumption is high. However, keep in mind that this is not an out of the box product and you will have to spend some money on additional components required for installation. It may also need pole breakers and other such support systems to function smoothly. If you don’t mind the extra installation costs, then this is definitely the heater with the highest features in technology.