MAREY 4 GPM Electric Tankless Water Heater - 18 kW 220-Volt-ECO180 - The Home Depot


Model # ECO180

Internet # 204357401

4 GPM Electric Tankless Water Heater - 18 kW 220-Volt

MAREY 4 GPM Electric Tankless Water Heater - 18 kW 220-Volt

This item has been discontinued.
The Home Depot no longer carries this specific product.

$289.00 / piece
  • Save up to 60% on electricity bills for water heating
  • Only in the market that doesn't get sediments
  • Digital panel allows the setup of the output water temperature


Model # ECO180

Internet # 204357401

The Marey ECO180 electric tankless water heater was designed with high-quality parts and components, including a patented heating element and a stainless steel cover. The water instantly heats as it pipes through the heater, delivering instant and endless hot water. It is also called water heater on demand, as the heat exchanger turns on using electricity only when the hot water is running. An external digital control panel allows you to easily adjust the water temperature to be set at your desired output temperature, no matter the water flow.

  • Smart technology avoids the excess temperature waste to any hot water point of use
  • Built with German technology
  • Patent design heating elements that do not accumulate sediments (long life time)
  • Provide endless hot water on demand and only as needed
  • Compact design saves space and is easy to install almost anywhere
  • Unlimited hot water whenever is needed

Info & Guides

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Assembled Depth (in.)  3.5 in  Assembled Height (in.)  16.1 in 
Assembled Width (in.)  11 in  Product Depth (in.)  3.5 
Product Height (in.)  16.1  Product Width (in.)  11 
Water Connection Size (in.)  3/4" 
Amperage (amps)  100  Electric Product Type  Commercial & Residential 
Finish Family  Silver Metallic  Flow Rate @ 35 F Rise (gallons/min)  4 gal (US)/min 
Flow Rate @ 45 F Rise (gallons/min)  3 gal (US)/min  Fuel Type  Electric 
Indoor/Outdoor  Indoor  Maximum Temperature (F)  81 
Minimum Activation Rate (gpm)  0.83  Minimum Temperature (F)  33 
Point-Of-Use  No  Product Weight (lb.)  16 lb 
Residential/Commercial/industrial Use  Residential or commercial  Returnable  90-Day 
Voltage (volts)  220  Water Connection Location  Bottom 
Wattage (watts)  18 
Warranty / Certifications
Certifications and Listings  ETL Listed  ENERGY STAR Certified  No 
Labor Warranty  5 Year  Part Warranty  5 Year 


Rated 4.2 out of 5 by 13 reviewers.
Rated 5 out of 5 by Best heating! This is a great heater: I can set up the output temperature and no matter the water flow it keeps heating the water at the same temperature! We could run 3 showers at the same time, which is a rare occasion but we needed one as the whole family had to go out and the water heater kept the heating capacity just fine! It was easy to install as its size fitted so well that we saved space for other stuff we wanted to keep in the closet. Definitely recommend it. January 6, 2014
Rated 1 out of 5 by terrible unit I purchased this Marey unit and have had issue after issue. The unit I purchased came broken. I of course found that out after my plumber charged me to install it. I also of course had to pay the cost of installing new electrical (you need 100 dedicated amps) and various other fittings needed to make the unit work. I then had to remove this unit and re-install my old water heater. I contacted Marey and I had to pay to ship my unit back to them even though it came broken. As I didn’t have much choice I did that. A “new” unit came without any instructions, had clear water marks on the exterior, and had none of the original packaging. After paying my plumber to come out again and spending more money at Home Depot the unit did not work. Jason (who works at Marey) told me the heating coils were not working properly. Marey now wants me to send them my unit and they will again send me another unit. That means I have to pay the plumber two more times. HEED MY ADVICE AND DO NOT BUY THIS UNIT! October 14, 2014
Rated 5 out of 5 by Excellent Product !!! LIKED Stainless Steel Covers looks Awesome !! Housing heating element very solid. Wiring is a little tedious , but is good to leave the work for Proffessionals. You'll save time and money. February 15, 2014
Rated 5 out of 5 by Great purchase; best price We ordered 2 units which arrived quickly and properly packaged. Nothing broken. The units went up quickly due to their compact size. Our code officials require overflow drains and disconnects on both circuits which can add to cost, but we were already prepared for this. Just keep in mind. Building inspectors commented at how cool these units are. With the LED displays and stainless steel enclosures, they add a serious "bling" factor to the mechanical room of the home we custom built. Owner really likes them! February 20, 2014
Rated 5 out of 5 by Awesome..... Installed it myself and found it easy. Looks very classy and works beautifully. Love the digital readout and the stainless steel finish. Would buy it again and recommend it. Smaller (narrower) than my old one, so fit in the same space. I have a log cabin with a very small bathroom, no basement or attic, so needed something that would take up little space. Very happy with my purchase. July 8, 2014
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