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Marey Refurbished REFGA10NGDP 2.7 GPM Digital Pane Water Heater


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Best Tankless Natural Gas Refurbished Water Heater Marey GA10NGDP 2.7 GPM


These units are customer returns.
They have been inspected and tested by the Technical Support at Marey and deemed to be refurbished.

What does this actually mean?

The customer set-up did not work with this unit and they returned it. Nothing wrong with the unit. Sometimes things just don't work out.

What else does this mean?

You can pick up the "like new " unit for a nice discount on the price.
The only thing you lose is some of the out of pocket expense.


These Refurbished units carry the same Marey 5 year warranty.


The convenience of hot water with just the turn of a faucet!

The Marey GA10NGDP Natural Gas tankless water heater is compact and durable, built to give you years of service.

The Digital Panel (DP) allows you to see what your output temperatures are.

The fuel source is Natural Gas and no electrical connection is required. The compact design saves space and allows for easy installation just about anywhere.

The unit activates by water flow from the moment the faucet is opened and hot water is available in just a few seconds. The Marey GA10NGDP can heat an unlimited volume of water as needed .

Marey GA10NGDP units use SMART heater technology.
It is a technology that self-modulates the amount of energy used by the heater, thus providing more efficient heating than the old standard type of heating where the heating element is on or off, giving you more consistent temperatures, while saving you money.

Maximum Flow Rate 3.0 GPM with temperature increase of 30° and Minimum Flow Rate of 1.0 GPM with a temperature increase of 100° (Please take caution and avoid scalding)

Works great for the following applications; Tiny house, small house, cabin, lodge, apartment, outdoor shower and much more. Could possibly be used anywhere you have Natural Gas and enough room for proper combustion air and venting.

The Marey gas tankless water heaters have been approved for installation across all housing types. If the unit is to be installed in a mobile home, check with your local building code to see if there are any specific requirements for installation in your region. You may also check with your local fire department. If you need additional information on your mobile home's compatibility with a tankless hot water heater, please contact the U.S. Department of Housing and Urban Development ( http://portal.hud.gov/hudportal/HUD).

If the unit is going to be installed in an RV, camper, or 5th wheel the customer should check with their local department of motor vehicle office to determine what the laws and regulations are for installing a tankless hot water heater.

The Marey gas tankless water heaters can be converted to support either fuel type (liquid propane or natural gas). To convert the unit, the customer must contact Marey customer service and purchase a conversion kit.

Adverse Weather Conditions and Tankless Water Heaters


Marey International, LLC

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Bringing you the best affordable tankless water heaters on eBay.
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We strive to provide you with excellent customer service and post sales assistance.


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 Technical Specifications

Here are the Specification concerning the Marey GA10NG Tankless Water Heater.

  Marey GA10NG


Marey GA10NGDP

The versatile and easy-to-install 10L Natural Gas Tankless Water Heater with digital display is the perfect energy efficient solution for your home which will not only help you save money, but also help you save money on your electric bills. This powerful unit only operates on 3V, making it ideal for off-grid applications or anywhere electricity is limited. Copper heat exchanger resists corrosion allowing it to last a lifetime. At a standard faucet flow of 1.5 GPM, the temperature increase is 67 degrees Fahrenheit. The LCD display gives an accurate outlet water temperature which ensures your hot water is always at the exact comfort level which you desire.

Quick Overview:

No electrical connection required.

  • Compact design saves: space and allows for easy installation just about anywhere.
  • Heats unlimited volume of water as needed.
  • Hot water is available in just a few seconds.
  • Activates by water flow from the moment the faucet is opened.
  • 5-year warranty.


- Saves water and up to 60% less electricity than conventional tank water heater, making it cost-effective and environmentally friendly.
- Can last a lifetime, keeping up to 87% efficiency level.
- Rustproof, no water loss due to leaks.

Bringing you the best affordable tankless water heaters on eBay.
We take our business very serious and appreciate your business.
We strive to provide you with excellent customer service and post sales assistance.


If you need help in determining which size unit is right for you. Contact us and we will more than glad to assist you.

Get Yours NOW!!!


  • Tankless Natural Gas Water Heater
  • Compliant with Department of Energy gas tankless water heater requirements
  • Digital Panel displays outgoing water temperature
  • Very DIY friendly and easy to install
  • Heats unlimited volume of water on-demand as needed
  • Does not require electricity (operates with 2D cell batteries)
  • Perfect alternative for homes with frequent power outages or off-grid applications
  • Only uses gas while water is flowing
  • Works easily with low levels of water pressure
  • Anti-combustion and gas pressure safety protection
  • Can maintain 87% efficiency level throughout a lifetime
  • Rustproof design, no water loss due to leaks
  • Saves water and uses up to 60% less electricity than conventional tank water heaters, making it cost-effective and eco-friendly
  • Excellent customer service support and 5 year warranty


This unit is in compliance with DOE regulations, 10 CFR 430 .32 (d), which determines the amended energy conservation standards for residential water heaters.

  • Energy Factor > 0.82 (for gas models) and Energy Factor> 0.93 (for electric models)


This GA10NGDP unit has a Energy Factor Rate: 0.85


The proper Venting Materials and procedure for the venting of the Natural Rise Power Gas Series are as followed.

The preferred material for these heaters is B-Vent (doubled walled, galvanized metal outside, polished aluminum inside). The GA5 and GA10 both require 4” venting and the GA16 requires 5”, but the supplied adapter may be used to go up to 6” (Never reduce in size).

You must establish an 18” collar rise before installing any bends or condensation catches. Never install a 90 degree bend directly on top of the heater.

The minimum height allowed is 6 ft; this is to allow enough pipe to heat up to properly vent the gases and moisture from combustion. A straight vertical run is preferable.

If horizontal runs are necessary then they must always be sloped up at least .25” for every foot and must be kept shorter than 75% of the total vertical length. Never terminate the venting horizontally; you need the last bit of vertical run to “pull” the remaining gasses that may have cooled in the horizontal run. Many municipalities require a “chase” to be added up to the roof line for any venting running up an exterior side wall of a structure. Please check local guidelines.

If venting through the roof then the termination height will depend on your roof pitch. If condensation is a concern for a specific installation then other more specialized materials should be used most common is Z-Vent (double walled stainless steel on both in and outside layers).

If there are any deviations from these guidelines then please seek the help of a qualified HVAC technician. Improper venting could be hazardous or even deadly


For more information check here.

Marey FAQ

B-Vent Catalog Downloadable PDF

The Sediment Pre-Filter and Isolation Valve Kit images below are for visual reference only.
Not included with water heater and must be purchased separately.

These items are suggested only and not necessary for this unit to work properly.  



It is recommended that an inexpensive pre-sediment filter be install for your Marey tankless water heater. This will help capture debris or particles that would interfere with the operation and longevity of your unit.             We suggest that you flush your Marey Tankless water heater at least once a year with white vinegar. There are numerous Youtube videos that demonstrate the procedure. By installing an isolation valve kit to your Marey tankless water heater this makes the process much simpler.

For Marey YouTube Videos on Marey Tankless Water Heaters and for Installation and Trouble Shooting follow the links below.

How Tankless Water Heaters Work
About Marey Tankless Units
Adjustments and Settings
Trouble Shooting: Part 1
Trouble Shooting: Part 2


Please make sure you check out the Temperature Map and the Flow Rate Chart to determine which heater is right for you.
Follow the links below to download the PDF files to your computer.

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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 Heater Corp offer 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.
Marey warranty is only valid for units sold in the USA and Canada.

For warranty details visit Marey at: Marey Warranty



  • 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 through the Global Shipping Program.
  • 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. You may also find the tracking number of your order in the "My eBay" tab.
  • 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.

Free Return Shipping only on MANUFACTURER DEFECTS within 30 days of purchase


30 Day Return Policy



Returns Happen, We accept returns on units that are in their original unused and uninstalled condition

To help us expedite your return please follow these instructions:


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 Customer Service Center in Miami, Florida.


You will then receive your refund after a Marey 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. Refunds will not be issued on products that have been broken or damaged by customer!


Product defects are covered by Marey's 5 year Limited Warranty as verified by the manufacturer.


*Free Return Shipping only available on units with actually Manufacturer Defects.*


Buyers must consult with a Marey Service Technician first prior to any return request and the unit deemed to have documented factory defect.


Units not functioning properly due to "customer set up" DO NOT qualify as a manufacturer's defect. Other non qualifying reasons Including but not limited to the following:


1. Unit not properly sized for desired application.
2. Unit not recommend for geographic location.
3. Customer power supply not suitable for installation of electric units.
4. Customer ordering wrong fuel type.
5. Customer water pressure or flow rate not consistent with minimum requirements for unit to function properly.


Buyer agrees that by entering into a transaction for this item to be bound by the terms of the above return policy and acknowledges that this is a legal and binding contract.


Buyers attempting to get around the return shipping by claiming "Item Not as Described or Defective" will be reported.


Returned units that have been damaged by buyer will be subject to restock fee or possible rejection of return claim.

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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 newest 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.


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This image is only a representation to illustrate how
gas tankless water heater work


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All sales are final 30 days from purchase date.

  • Model: REFGA10NGDP
  • Shipping Weight: 24lbs
  • 3 Units in Stock
  • Manufactured by: Marey

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This product was added to our catalog on Wednesday 30 May, 2018.