Model # ECO180

Internet #204357401

MAREY 5.0 GPM Electric Tankless Water Heater - 18 kW 220-Volt
0764177000255

MAREY

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

  • Save up to 60% on electricity bills for water heating
  • Only in the market that doesn't get sediments
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.
$329.89 /piece

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Product Overview

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.

  • Unit has to be installed by a certified professional
  • 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)
  • Compact design saves space and is easy to install almost anywhere
  • Corrosion resistant heating elements, reduces hard water build up due to chlorine and calcium
  • Unlimited hot water whenever is needed
  • Saves water and uses up to 60% less electricity than conventional tank water heaters, making it cost-effective and eco-friendly
  • Perfect for U.S. customers
  • Patent design heating elements (long life time)
  • Our units use SMART technology by only applying the power need to heat the water to the desired temperature, maximizing energy savings
  • Determine the proper Tankless Water Heater for your household by using our buying guide

    Marey Tankless Water Heater

  • Use our temperature map to calculate your Gallons Per Minute

    Marey Tankless Water hEater Temperature Map

Info & Guides

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Price
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Name 5.0 GPM Electric Tankless Water Heater - 18 kW 220-Volt 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 MAREY EcoSmart EcoSmart EcoSmart
Ratings (27) (120) (38) (141)
Flow Rate @ 45 F Rise (gallons/min) 3.5 2.73 3.64 4.10
Wattage (watts) 1800.000 18000 24000 27000
Indoor/Outdoor Indoor Indoor Indoor Indoor
Water Heater Features No Additional Features Wall Mountable Wall Mountable Wall Mountable
Certifications and Listings 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

9 Questions21 Answers

Customer Questions & Answers

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

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7 answers

will this make hot water for a good shower

This question is from 4.0 GPM Electric Tankless Water Heater - 18 kW 220-Volt
Asked by
ventnor
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December 21, 2015
have 30amp heater now is wire big enough
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Answers (7)

Asked by
Jefferson City, Missouri
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Home Improvement Profile: Professional
August 22, 2016
Answer: 
TECHNICAL SPECIFICATIONS ECO180
Max. Amperage Load 75A
Min. Required Circuit Breaker Size 2x50A
Recommended Wire Size 2x8 AWG copper
Max. Temp. Increase at 1.5 GPM 81ºF
If your incoming water temperature is 50 degrees you can get a good shower up to about 2GPM. That means no 'rain-shower heads', but a standard water-conserving shower head with the restrictor in place should work. Please note that Read More
TECHNICAL SPECIFICATIONS ECO180
Max. Amperage Load 75A
Min. Required Circuit Breaker Size 2x50A
Recommended Wire Size 2x8 AWG copper
Max. Temp. Increase at 1.5 GPM 81ºF
If your incoming water temperature is 50 degrees you can get a good shower up to about 2GPM. That means no 'rain-shower heads', but a standard water-conserving shower head with the restrictor in place should work. Please note that your incoming water temp could drop below 50 degrees in the winter
Master Plumber Mike Read Less
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Asked by
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June 1, 2016
Answer: 
This is indeed a 100amp unit, but it uses two 50amp breakers. 8 gauge wire if stranded 6 gauge if solid, four conductors total. Plus a ground.
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Asked by
Florence, KY
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Home Improvement Profile: DIYer
May 31, 2016
Answer: 
Works great for me. Unlimited forever.
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Asked by
Dayton, NV
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May 20, 2016
Answer: 
Using a tankless heater fthe best way to make sure the temp stays hot in the shower is to tuen the hot water on full till it's hot at the shower. Then add cold to get the timp right where you want it. You should be able to take a long shower. Make sure you wite it right. you are taking out a 40 AMP heater and replacing it with 2 x 50 (100) amp breakers and # 10-3 wire.."Use the Uniform Electrical coe" Read More
Using a tankless heater fthe best way to make sure the temp stays hot in the shower is to tuen the hot water on full till it's hot at the shower. Then add cold to get the timp right where you want it. You should be able to take a long shower. Make sure you wite it right. you are taking out a 40 AMP heater and replacing it with 2 x 50 (100) amp breakers and # 10-3 wire.."Use the Uniform Electrical coe" Government standards
Good Luck
Mondoggie
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January 22, 2016
Answer: 
I know this was asked a while ago, but so others who may see it are not confused by the previous answer.. Or burn their house down- a 30 amp circuit should have a minimum of number 10 wire, not 12, and almost positively would be a 220/240v circuit for a water tank. For this tankless, at 18,000 watts divided by 220v that puts it running at about 80 amps, which is why it calls for a 100 amp circuit. You Read More
I know this was asked a while ago, but so others who may see it are not confused by the previous answer.. Or burn their house down- a 30 amp circuit should have a minimum of number 10 wire, not 12, and almost positively would be a 220/240v circuit for a water tank. For this tankless, at 18,000 watts divided by 220v that puts it running at about 80 amps, which is why it calls for a 100 amp circuit. You would not hook this up to a 50 amp breaker. As per the manufacturer specs you would install it on a 100 amp breaker and size your wire accordingly. So long story short- no, the wire from your current 30 amp breaker would not be large enough for this unit. Read Less
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Asked by
Mascoutah, IL
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Home Improvement Profile: DIYer
December 30, 2015
Answer: 
According to the chart included in product description yes provided you use a low or standard flow shower head.
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Asked by
Mascoutah, IL
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December 30, 2015
Answer: 
You'll need to check with an electrician but I assume your 30 amp water heater is a 110 volt unit using 12 gauge wire for the circuit. The specs state this is a 100 amp device which would require 2 50 amp breakers providing 220 volts heavier gauge wire.
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3 answers

high mineral water

This question is from 4.0 GPM Electric Tankless Water Heater - 18 kW 220-Volt
Asked by
Dayton, Nevada
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April 25, 2016
I currently use a 40 gallon electric heater and haven't had problem with buildup on the elements yet. Will I have problems with high alkaline water and high iron content..Is the element replaceable if it fails, and what is the cost of the replacement
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Answers (3)

Home Improvement Profile: Professional
August 22, 2016
Answer: 
I don't believe you would want to replace the elements in a tankless electric heater. I have seen people just change them out. You will DEFINITELY WANT A WATER SOFTENER ahead of ANY TANKLESS HEATER, PERIOD!
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August 22, 2016
Answer: 
Tank-less heaters have very small passages that are soon clogged if subjected to water with any Calcium/Lime content (hard water). I have seen and replaced tankless electric water heaters ruined in less than a year with water at approximately 20 grains of hardness.
Don't buy a tankless unless you will have a softener protecting it.
Master Plumber Mike
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Asked by
Florence, KY
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Home Improvement Profile: DIYer
May 31, 2016
Answer: 
That is a good topic. The baffles will have problems in the long run, unless you can figure a way to run vinegar through it every six months to a year. I built on a pre valve chamber to access it with.
User submitted photo
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3 answers

On the specs say is for indoor, can install outside the house but with a roof???

This question is from 4.0 GPM Electric Tankless Water Heater - 18 kW 220-Volt
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January 26, 2016
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Home Improvement Profile: Professional
August 22, 2016
Answer: 
ONLY if the ambient temp NEVER gets below freezing
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Asked by
Florence, KY
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May 31, 2016
Answer: 
It isn't a weather sealed box so it would need to be a well protected exterior wall mounted box.
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February 5, 2016
Answer: 
No, this unit should be installed entirely indoors.
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2 answers

Can I use this in an 36' RV? If so, what do I need to modify?

This question is from 4.0 GPM Electric Tankless Water Heater - 18 kW 220-Volt
Asked by
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May 4, 2016
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Asked by
Jefferson City, Missouri
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Home Improvement Profile: Professional
August 22, 2016
Answer: 
In the installation guide you will see on page 5 that this ECO180 unit requires TWO 50-AMP circuits, and maximum load is 75 watts. I believe it is unlikely that you have that much 'spare' capacity in your electrical breaker box or electrical service. This unit will only cover one water-saving shower head even at that load, so keep that in mind if you plan to use a tankless any time of year other than Read More
In the installation guide you will see on page 5 that this ECO180 unit requires TWO 50-AMP circuits, and maximum load is 75 watts. I believe it is unlikely that you have that much 'spare' capacity in your electrical breaker box or electrical service. This unit will only cover one water-saving shower head even at that load, so keep that in mind if you plan to use a tankless any time of year other than summer. Another important thing to remember is that no tankless water heater should ever be used without the protection of a water softener, because the minerals will come out of the water when it is heated and WILL CLOG THE SMALL PASSAGES INSIDE THE TANKLESS HEATER IN SHORT ORDER.
TECHNICAL SPECIFICATIONS ECO180
Max. Amperage Load 75A
Min. Required Circuit Breaker Size 2x50A
Recommended Wire Size 2x8 AWG copper
Max. Temp. Increase at 1.5 GPM 81ºF
16" x 11" x 3,5"
Weight 18.3 lbs
Height x Depth x Width
Temp. Scope 86~127ºF
Installation Vertical Mounted
Master Plumber Mike Read Less
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Asked by
Dayton, NV
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May 20, 2016
Answer: 
You will have to increase the size of the pipe coming from the propane tank. remember you're replacing a 60,00 BTU heater with a 175,000 BTU heater. Try to find a unit with the smallest BTU rating that will give you the GPM you need without increasing the gas line
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Customer Reviews

5.0 GPM Electric Tankless Water Heater - 18 kW 220-Volt is rated 3.7 out of 5 by 26.
Rated 3 out of 5 by from Overall good. My only issue is the flow rate is less than expected. My water pressure is pretty l... Overall good. My only issue is the flow rate is less than expected. My water pressure is pretty low to begin with but I still needed to choke down the inlet to get the water up to set temperature. This is for a single bathtub at considerably less than 5 gallons per minute. Not a huge hardship but it was disappointing..
Date published: 2016-12-07
Rated 2 out of 5 by from We installed the tankless hot water heater for our shower a little over a week ago and we are thi... We installed the tankless hot water heater for our shower a little over a week ago and we are thinking of returning it. Admittedly, we probably underestimated its ability to heat the ground water in our area- but according to the chart - it should be able to handle heating 2.5gpm. We find ourselves adjusting the water pressure up- to make it work harder- then down to get up to temp. And then it often can't maintain the heat and during the shower, the temp will drop a few degrees. The inconsistancy is really a problem and while we may be saving on electricity, we are not saving on water. We often have to run the shower for 5 minutes before you can get a good temperature.
Date published: 2016-12-20
Rated 4 out of 5 by from Good Choice to a standard waterheater The product performs perfectly as described....but. A couple of things could have been better explained in the description and there is a way that it performs better that varies from what people used to tanked water heaters are familiar with. If you are pre-preparing for its arrival you need to know that it IS 100amps, but that it is two double pole 50amp circuit's, so that's four power wires and a ground. And when you're running it don't set the temperature to the maximum or it will cycle through "over heating" a lot. Set it down one notch and it works perfect. And when you run a shower, turn it all the way up for a few seconds and then down to where you normally run it. it will heat up faster that way. Remember this is not a tanked water heater, so there are different rules. Other than that, which I consider part of my learning curve, it is the best decision I've made for home improvement in quite a while.
Date published: 2016-05-31
Rated 4 out of 5 by from I return the tankless water heater because after removing junk out of my utility room the leak wa... I return the tankless water heater because after removing junk out of my utility room the leak was coming from a pipe leading to my water heater. Confucius say (if it's not broken don't replace it.) So I'm hanging on to old unit.
Date published: 2016-11-22
Rated 1 out of 5 by from It's not as hot It trips the breaker. It doesn't make enough hot water. I am going to return it when I receive my income tax
Date published: 2017-01-10
Rated 3 out of 5 by from The unit seems to do an adequate job, but it causes a very objectionable radio static! The unit seems to do an adequate job, but it causes a very objectionable radio static!
Date published: 2016-12-20
Rated 5 out of 5 by from 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.
Date published: 2014-01-06
Rated 4 out of 5 by from 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.
Date published: 2015-02-17
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