Model # ECO 18

Internet #203316216

Store SKU #1000047991

Store SO SKU #1000094374

EcoSmart 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater
0854920002046

EcoSmart

18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater

  • Perfect for apartments with up to 3 people
  • Requires 2 x 40 Amp Double Pole Breakers
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.
$425.00 /each

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Product Overview

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EcoSmart Electric Tankless Water Heaters, also called Instantaneous On Demand Water Heaters, provide endless hot water on demand and only as needed. Self-modulating flow sensor technology regulates the amount of energy required to heat the water needed. This Smart Technology electric tankless water heater is configured for climates where incoming water temperature is 62 Degree F and above. The ECO 18 is capable of heating over 2.5 GPM, which is the equivalent of one shower head (with a 1.5 GPM flow) and one sink with a low inlet water temperature of 62 Degree F. Two showers can be run simultaneously when incoming water temperature is above 70 Degree F in warmer climates such as South Texas, South Florida, New Mexico, Arizona and South California.

  • Lifetime warranty
  • Patented self-modulating technology and design
  • Never run out of hot water with an EcoSmart tankless water heater
  • Digital temperature control allows you to set your temperature in increments of 1 degree
  • All EcoSmart electric tankless water heaters come with an automatically resettable thermostat as opposed to a manually resettable thermostat; the integration of all components and quick connections are designed to promote simplicity for the installer and the user
  • Prior to purchase and installation please verify this model is the rights size for your hot water needs and electrical requirements
  • Refer to the info and guides for help with: location specifications map, installation, and troubleshooting
  • Click here to check out our buying guide on water heaters
  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Name 11 kW 2.14 GPM Self-Modulating Electric Tankless Water Heater 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater 24 kW Self-Modulating 4.6 GPM Electric Tankless Water Heater 27 kW Self-Modulating 5.3 GPM Electric Tankless Water Heater
Brand EcoSmart EcoSmart EcoSmart EcoSmart
Ratings (47) (115) (37) (134)
Flow Rate @ 45 F Rise (gallons/min) 1.97 2.73 3.64 4.10
Wattage (watts) 11000 18000 24000 27000
Indoor/Outdoor Indoor Indoor Indoor Indoor
Water Heater Features Wall Mountable Wall Mountable Wall Mountable Wall Mountable
Certifications and Listings 1-UL Listed,CSA Listed,ETL Listed 1-UL Listed,CSA Listed,ETL Listed 1-UL Listed,CSA Listed,ETL Listed 1-UL Listed,CSA Listed,ETL Listed
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Customer Questions & Answers

39 Questions97 Answers

Customer Questions & Answers

18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater
18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater

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7 answers

what causes the heating element to turn on?

This question is from 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater
Asked by
The Villages, FL
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October 31, 2014
Is it always adding a little heat to the manifold, and a temperature drop switches on the power. Or is it pressure or flow sensing?
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Answers (7)

Asked by
Florida
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Home Improvement Profile: Other
September 2, 2016
Answer: 
Watch the video!!! :)
That is what the video is there for... it will tell you exactly how the heating element works.
I am purchasing one tomorrow,
I will report the pro's and cons after it is installed and tested.
Have a Great Day!!
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Asked by
Ottawa, IL
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August 9, 2016
Answer: 
There is a water flow switch inside to detect water flow.
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Asked by
Golden, Colorado
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March 8, 2016
Answer: 
The water flow sensor built into the unit activates the heater elements when water is turned on.
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Asked by
Florida
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January 14, 2015
Answer: 
water flow sensor, senses the flow of water through unit and also works to regulate energy use.
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Asked by
Terrebonne, Oregon
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Home Improvement Profile: DIYer
January 8, 2015
Answer: 
Generally speaking, tankless heaters are turned on by water flow. The exact method likely varies by manufacturer. The unit you are looking at has a flow sensor. The heating elements would be off with no flow.
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Asked by
Scottsdale, AZ
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November 11, 2014
Answer: 
Water flow sensing turns it on.
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Asked by
fl.
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Home Improvement Profile: DIYer
November 2, 2014
Answer: 
i believe its pressure flow only comes on when you run the hot water.
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7 answers

Is this for a whole apartment or a single point?

This question is from 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater
Asked by
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October 11, 2014
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Answers (7)

Asked by
Anonymous
South Florida
Home Improvement Profile: DIYer
October 7, 2016
Answer: 
I have a 4 bedroom house and at most we only have 1 shower and 1 sink running at the same time but we have to turn it down as the water comes out too hot at times.
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Asked by
Ottawa, IL
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August 9, 2016
Answer: 
whole apartment.
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Asked by
Golden, Colorado
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March 8, 2016
Answer: 
I'm feeding my 3 bedroom 2 bath house with it.
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Asked by
Florida
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January 14, 2015
Answer: 
whole apartment, but one should check charts provided by manufacture for effectiveness. This is based on number of taps and ambient water temps.
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Asked by
Terrebonne, Oregon
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Home Improvement Profile: DIYer
November 21, 2014
Answer: 
There is a chart to help you determine what size tankless heater you need, depending on both the incoming water temperature, and the gallons of water flow demand you need - 1 shower at a time, 2 showers and a faucet at a time, etc. Check the chart. it will give you the minimum size tankless heater you need. Under "specifications" you will see what amperage the unit draws so you can determine how many new Read More
There is a chart to help you determine what size tankless heater you need, depending on both the incoming water temperature, and the gallons of water flow demand you need - 1 shower at a time, 2 showers and a faucet at a time, etc. Check the chart. it will give you the minimum size tankless heater you need. Under "specifications" you will see what amperage the unit draws so you can determine how many new 40 amp breakers you will need. Each 40 amp breaker requires #8 wire from your panel to the tankless heater. So a 27kW heater will draw 112 amps. That will require 3 - 40 amp breakers, each with #8 wire run to from the main panel to the tankless heater. You can't use the current electrical wiring that was installed for the current tank heater. Read Less
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Asked by
Scottsdale, AZ
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November 11, 2014
Answer: 
It will work for the whole apartment, you just have to size it for the amount of hot water you will need at one time from their chart on the web site. The chart gives you inlet water temperature, number of faucets/shower heads running with flow rates to figure out what size you need. I put this 18KW size in my 3 bedroom,2.5 bath house where there are 2 people living.
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Asked by
fl.
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October 21, 2014
Answer: 
its for whole apartment but would suggest if your to going to run more than 1 shower at a time go to next size up. will do just fine with one sink and shower. but you will need one with more water flow for more than that.
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6 answers

Can these units be plugged In a 240 electrical socket

This question is from 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater
Asked by
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May 1, 2016
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Asked by
Golden, Colorado
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August 11, 2016
Answer: 
Highly unlikely. It actually requires 2 separate 40 amp 240volt services. It draws 75 amps of 240volts at peak use.
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Asked by
Ottawa, IL
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August 9, 2016
Answer: 
have to have two seperate 240v 40 amp circuits.
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Asked by
Terrebonne, Oregon
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Home Improvement Profile: DIYer
May 25, 2016
Answer: 
NO! They need to be hard wired in, and, depending on the unit that you choose, it will take more than one 240V circuit. See the chart in the specifications. The 18KW unit needs two 40 amp circuits, and so on as you go up in size.
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Asked by
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May 3, 2016
Answer: 
The ECO-18 requires 2 double pole 240 volt, 40 amp circuit breakers. It requires 4 breaker spaces in the electric panel. I suppose you could install 2 240 volt, 40 amp rated cords and plugs on the unit and 2 240 volt, 40 amp receptacles near the unit and then just plug it in. Just make sure both plus and receptacles are grounded.
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Asked by
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May 2, 2016
Answer: 
Theoretically yes, but would require 2 of them since it requires 2 240V feeds.
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Asked by
hilliard, florida
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May 2, 2016
Answer: 
NO. They require 2runs of 8 ga. direct wiring.
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5 answers

do I need a plumber to install this unit or are the instructions good enough for a handy man to install it?

This question is from 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater
Asked by
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November 18, 2014
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Asked by
hilliard, florida
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May 26, 2016
Answer: 
I am a DIYer and had no problems with install. Have done several for friends, even installed one in a kitchen cabinet( after gutting and lining with fire rock for safety).
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Asked by
Golden, Colorado
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March 8, 2016
Answer: 
It's easy to install but the lifetime warranty is only valid if a licensed plumber installs. I chose to do it myself because plumbers are more costly than replacing the unit if it fails.
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Asked by
MD
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June 29, 2015
Answer: 
Easy to install. Warranty requires plumber or electrician installation to be valid.
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Asked by
Florida
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January 14, 2015
Answer: 
i recommend snake bite fittings, no plumber needed, just pipe cutter. don't forget to clean up pipe ends
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Asked by
Terrebonne, Oregon
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Home Improvement Profile: DIYer
November 21, 2014
Answer: 
I don't think plumbing is the issue. With flex pipe, like is on your current tank heater, the plumbing should be a snap. The issue with electric tank heaters is the electrical service needed. A typical tank heater has 2 - 4500 watt heating elements and can run on a 30 amp breaker with #10 wire (240V). Electric tankless heaters have one or more 9000 watt heating elements, and it is likely that all of them Read More
I don't think plumbing is the issue. With flex pipe, like is on your current tank heater, the plumbing should be a snap. The issue with electric tank heaters is the electrical service needed. A typical tank heater has 2 - 4500 watt heating elements and can run on a 30 amp breaker with #10 wire (240V). Electric tankless heaters have one or more 9000 watt heating elements, and it is likely that all of them will come on at some point. Each 9000 watt element will require #8 wire and a 40 amp breaker (240V). If your electrical panel is full, then you would need to add a sub-panel for this project. At the very least, you would need to make sure that you have enough space in the main panel to add any additional 240V 40 amp breakers over and above the 30 amp breaker you will be replacing. Plus you will need to pull new, #8 wire for each breaker you are adding, from the panel to the tankless heater location. Probably best to have a licensed electrician do this, unless you are adept at wiring. Depending on your local jurisdiction, you will likely need to get an electrical permit. Read Less
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Customer Reviews

Rated 4.2 out of 5 by 114 reviewers.
Rated 4.0 out of 5.0 by bought this one as my traditional water heater was slowly dying, replaced it on Oct 10 2016 First day everything worked with out a hitch, day two had to reset the unit by tripping the breakers, day five unit was not working, called the company, left message they called me back the next day, they overnighted a new flow sensor, I installed the new one with out any issue and have not had am issue since. Customer service was fast, and very polite. I will see with next months FPL bill if its going to pay for itself. October 24, 2016
Rated 5.0 out of 5.0 by This product works really well and is easy to install. Yes I would recommend this to all my customers and any one who needs hot water when it takes a long time for the hot water to get to the tub or the dishwasher. The water is warm and gets hotter as you use it and you can set the temp to what you want it to be. I found it saves money and is worth every cent spent on this product. October 26, 2016
Rated 5.0 out of 5.0 by ECO Smart 18 Received unit within 8 days. Had new 8 gauge wire pulled to unit. Hooked up water & put in sediment filter in front of unit & bleed air out. Turn on breakers but system would not make hot water. Called Eco Smart & they decided it was the mother board after I tested system the way they wanted. Got mother board over night & installed it. I also bought a flush valve system/ pop off valve for both hot & cold sides & a large wall mounted dip pan in case of water leaks. System has worked more consistently than my old 50 gal. heater. Make sure to insulate both hot & cold lines for better performance! September 13, 2016
Rated 4.0 out of 5.0 by EcoSmart 18 kW Self-Midulating 3.5 I recently purchased this unit to replace an old electric 20 gallon tank unit. With the exception of having to make some modifications to the electrical, such as adding two 40 amp breakers and placing the required electrical cable, this unit makes a big difference in occupying space. So far I have been please with the way it is designed for use. As for how fast the hot water arrives to the faucet, it takes a bit longer than the old tank unit but once it arrives, it is fine. I am waiting to see how it actually impacts my water heating savings consumption. September 20, 2016
Rated 4.0 out of 5.0 by Excellent Easy to install, it provides continuous hot water whenever needed. Have it in a three bedroom 2 bath home and it is working great. Too soon to see savings on the electric bill but that will come October 11, 2016
Rated 4.0 out of 5.0 by ECO 18KW Tankless Water Heater Easy installation. I replaced a E-max similar in size. The Eco seems to be more user friendly. In time we will be able to see quality of the product. It givers the impression that is a good Tankless Water Heater.e September 7, 2016
Rated 5.0 out of 5.0 by Eco Smart tankless waterheater I love my Eco Smart Tankless Waterheater. It heats up very fast and much hotter than my old Waterheater. Thank you for producing it,it's a great product. Since I live in a Condo and space is a premium I now have all that extra space. Everyone that's seen it here where I live can't wait till their Waterheater wears out so they can get one of yours. Thanks again, Judi August 18, 2016
Rated 3.0 out of 5.0 by Okay Not please with the temperature of the water, not performing to the max. August 27, 2016
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