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.

$370.00 / 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 
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 4.3 out of 5 by 17 reviewers.
Rated 5.0 out of 5.0 by Great Product! Great product at a great price. Great deal on switch, fast shipping, AA++ January 12, 2015
Rated 5.0 out of 5.0 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 4.0 out of 5.0 by Different but awesome This product is great but different from a traditional water heater. In coming water temperature and how much water demanded on output all play factors in the heating so I can see how this product may not heat as well or as fast in colder climates but for south east Georgia it has met all expectations. Unlimited hot water is definetly a luxury and at the same price as a tanked water heater it will also save you money. I had the larger wire and breakers done by a professional electrician but ran the plumbing myself and didn't have any problems. In my opinion it's a smart buy we will just have to see if it lasts the lengths of time. February 17, 2015
Rated 3.0 out of 5.0 by ok so far, works fine for sink but had to change shower head, our water inlet temp is 48 degrees,in jan ok so far, works fine for sink (1.5gpm) but had to change shower head, our water inlet temp is 48 degrees,it heats it up to 111, with our old large 2.5 gpm shower head would not come out hot enough but it is heating the water over 66 degrees not bad for the price. instructions could be a little more user friendly for the average diy guy,im a contractor and had to read it several times myself to make sense. warranty on home depot states 5 yr parts and labor but that's not what it says in the warranty paper you get with it,calling mfg to see what they can send me in writing home depot says they don't honor warranty you have to go to mfg period..well either way im buying a back up cause it could take days with out hot water ,been there done that with rheem got exactly what there names says rheemed! thats why i went to this had best warranty (i hope still working on it.....if you power goes out a lot it will be a very cold shower lol,better have a wood stove lol if this don't last im done will go back to the gas w/h sometimes i wish i did........good luck! January 19, 2015
Rated 3.0 out of 5.0 by Returned Product Product could not be installed in my home without expensive additional work. It requires 50-amps and my circuit breaker only has 40-amps. March 10, 2015
Rated 5.0 out of 5.0 by Endless Hot Water for the Whole House! I waited til we had used this for a couple of months before I came back to review it. When I bought it, there were no reviews on it, which made me a little nervous. Happily, several people seem to have bought it when I did, as I am adding to reviews already up. We bought this unit to serve our little, down-sized house, 2 bedroom 2 bath, and it works like a champ! The trick to regulating the hot water in the shower is to let the hot water get all the way up to temp before turning on the cold tap to mix. We installed this in the small house that we renovated and since it's just the two of us, and it serves our needs well. The only complaint that I have is that it maxes out at 125 degrees. When I fill my cast iron claw foot tub, the tub will cool the water somewhat. Ok for me, but my husband likes a really HOT soak.I went electric, rather than gas because I plan on generating my own power in the future. :-) This is a great unit at a great price and I would highly recommend it to anyone looking to ditch the space hogging, energy guzzling conventional tanks. Our house is so small, that every square inch counts and I wouldn't give up the real estate to install a 40 gallon tank. My husband was a hard-sell, but now that it's in and he's sees how practical it is, he loves it! On installation: our contractor installed it and he said that he had to call customer support as the instructions were vague, but he said that they were very helpful and courteous! March 1, 2015
Rated 5.0 out of 5.0 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 1.0 out of 5.0 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
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