Marey ECO150 Tankless Water Heater 3.5 GPM 14.6kW


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Make your dollars stretch further all year long.


Marey ECO150 ETL Approved Tankless Water Heater can save you energy and money! At 14.6kW this unit is ideal for up to two simultaneous points of use increasing incoming water temperature up to 29°F at a 3.5GPM water flow rate.
Please consult the temperature map for suggested points-of-use according to your geographical area. For the full 3.5 GPM, this unit is suggested for warmer climate locations with higher incoming water temperatures. This model now has a digital control panel to display the out going water temperature. It also has a new and improved heating element.

The ETL & NSF rating allows for licensed installers to install in the U.S.A and Canada.

Quick Overview:

  • Unit requires 220V ~ 240V and (1) 70 Amp Double Pole breaker
  • The MAREY ECO series tankless water heaters are the only ones in the market to include a German-designed, patented heating element with a stainless steel water channel. 
  • The high-quality component is corrosion resistant and reduces hard water build-up from chlorine and calcium.
  • SMART Technology: easy management and simple adjustments on a LCD Panel allows you to program the exact desired water temperature thereby optimizing energy consumption.
  • Flow switch activation mechanism allows the unit to produce constant temperatures with as little as 0.5GPM - 5PSI.
  • Tankless water heaters provide an efficient hot water solution eliminating the stand-by energy consumption of conventional tank units.



Why Choose Marey

Why Marey Water Heaters? Because Marey has designed and manufactured water heater since 1955.
Why Marey? Because this unit is one of the most popular point of use water heaters available from Marey.
Why Marey? Because we feel that everyone should have access to hot water and be able to cut their energy consumption at the same time.
SO, If you want a good quality point of use water heater with a 5-year all parts warranty, buy a Marey from us.


Product Information



Works great for

  • small or tiny homes
  • apartments
  • condos
  • cabins
  • lodges
  • camp grounds
  • businesses
  • schools
  • offices
  • mobile homes
  • and much more etc., etc., etc....



Temperature Map and Flow Rates


Temperature Map






Smart Technology: Self modulated unit, that regulates the amount of energy used by the heater.

  • ETL approved
  • Micro-computer control
  • Digital operation panel with temperature set and output water degree display
  • Conversion between degree Fahrenheit and degree Celsius
  • Tankless on demand for instantaneous hot water and no pre-heating
  • Automatically turns on and off
  • No stand-by heating loss; energy-saving
  • Dry heating thermal shut-off
  • Malfunction sensor shut-off
  • Electrical creepage automatic shut-off
  • Over temperature protection
  • Stainless steel cover
  • Adjusts to your needs: you can set up your desired output water temperature!
  • Compact and powerful.
  • Saves water and up to 60% less electricity than conventional tank water heater
  • Cost-effective and environmentally friendly
  • 5-year all parts warranty.



Technical Specifications


Here are the Specification concerning the Marey ECO150 Electric Tankless Water Heater.






For Marey YouTube Videos on Installation, Settings and Adjustments and Repair and Troubleshooting follow the links below.

These YouTube videos below are for the ECO110. However, the ECO150 unit is very similar and the videos should be helpful.

Installation, Settings, and Adjustments

ECO110 Repair and Troublshooting


Warranty and Registration Information

5 Year Limited Factory Warranty!


You have 30 days from your purchase date for any warranty returns for refund.

Marey Heater Warranty Program
Please note regardless when you register the unit your warranty will start from the purchase date.

Marey International, LLC offers an industry leading 5 year all-parts warranty on all their tankless water heaters. Marey's heater warranty is comprehensive and covers all manufacturer's defects.
The Marey International, LLC warranty is only valid for units sold in the USA and Canada.


Shipping and Return



  • FREE Shipping to U.S. Mainland addresses only.
  • We do not offer free shipping to Alaska or Hawaii, however we do ship to those locations. Enter your zip code under the Shipping and Payments tab to get your rate.
  • We do offer International Shipping on this item, contact us for a quote.
  • When product has been paid for, we will submit the order to be processed and shipped within 24 hours. Weekends and holidays are excluded. Shipping time may vary due to your requested delivery location.
  • Your shipment will originate from a warehouse nearest to your location if possible. Most items are shipped FedEx, USPS and UPS.
  • You will receive a shipping update email containing a tracking number.
  • If your package arrives damaged, refuse the shipment and contact us. If the shipping company has left before you realize the package is damaged, contact us immediately. Concealed damages must be reported to the carrier within 24 hours of receipt.
  • All shipping and handling cost are non-refundable. If buyer provides incorrect address or refuses delivery, the original actual shipping cost will be deducted from any monies refunded.


To help us expedite your return please follow these instructions:

  • Units must be in new unused condition the same as when shipped from the warehouse.
  • Contact us in advance for a RMA number (Return Merchandise Authorization)
  • Follow the detailed return instructions that we provide to you, which include the RMA# and shipping address to the Marey International, LLC.
  • You will then receive your refund after a Marey International, LLC service technician inspects the returned product and has issued a credit memo.
  • Buyer is responsible for all shipping costs associated with the 30 day return, plus all returns are subject to a restocking fee.

*Free Return Shipping only available on units with actually manufacturer defects.

Refunds will not be issued on products that have been broken or damaged! Product defects are covered by Marey International, LLC's Warranty as verified by the manufacturer.

  • Buyer must consult with a Marey International, LLC Service Technician and the unit deemed to have a factory defect.
  • Units not functioning properly due to "customer set up" DO NOT qualify as a manufacturer's defect.
  • Returned units that have been damaged by buyer will be subject to restock fee or possible rejection of return claim.




  • Model: ECO150
  • Shipping Weight: 12lbs
  • 10 Units in Stock
  • Manufactured by: Marey

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This product was added to our catalog on Wednesday 29 April, 2020.