EcoSmart ECO 18 Review


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

The Pros & Cons of the EcoSmart ECO 18


  • 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
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    Digital temperature control feature makes it possible for users to set temperatures in 1-degree increments


  • 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.


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
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.25
Minimum Temperature (F)80
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.


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.

You can buy the EcoSmart ECO 18 on Amazon.

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