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Marey REFGA16NGETL 5.4 GPM Natural Gas Water Heater


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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. 
These Refurbished units carry the same Marey 5 year warranty. 

The only thing you lose is some of the out of pocket expense.



Marey Natural Gas 5.4 GPM GA16LNG * ETL * Tankless Water Heater *Whole House* 


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USA Mainland Only

16 L - 5.4 GPM Tankless Water Heater

Natural Gas Water Heater
16L NG   ETL with Digital Panel


Why Marey Tankless Water Heaters? Because Marey has designed and manufactured tankless water heater since 1955.

Why Marey? Because this unit has passed the DOE Compliance with an "Energy Factor Rate of 0.85 " making it one of the best water heaters on the market.

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 tankless water heater with a 5 year all parts warranty, buy a Marey from us.

Free Return Shipping on Manufacturer defects within 30 days of purchase



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 16NG ETL unit has a Energy Factor Rate: 0.85

The convenience of hot water with just the turn of a faucet!
Marey GA16L NG ETL natural gas (NG) water heater can provide instant on demand hot water when ever you need it.
Compact and durable, built to give you years of service. 

Works great for your home, office, trailer, rv, camper or 5th wheel.

ETL Approved: The ETL Listed Mark is proof of product compliance (electrical, gas and other safety standards) to North American safety standards.

Comes with an installation guide, mounting hardware and a five (5) year warranty.
Oh and the price isn't bad either.


This heater requires a direct vent. Exhaust vent must be of AL 29-4C® Stainless Steel
and vent directly to the outside of the building.

The combustion air intake pipe may be ABS, PVC, galvanized steel, corrugated aluminum
or other materials acceptable to local codes.

Both the combustion air intake and the exhaust vents are 3". 

The exhaust vent and intake pipe are not included and will have to be purchased separately.



Bringing you the best affordable tankless water heaters on the market.
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!!! 

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.


Z-Vent material must be used for venting all gas (natural & propane ) tankless hot water heaters. The condensation of a tankless water heater is slightly more acidic than a standard water heater.  Z-Vent is double walled stainless steel vent pipe made specifically for venting tankless heaters.  Z-Vent is intended for the lifetime use and will never corrode or rust.
Z-Vent material is available at most home improvement stores and can be found at many online retailers as well.
4" for the 5L and 10L units and 5" for 16L units,  EXCEPT THE GA16 ETL units require 3" vent pipe.  Use the coupler provided with your unit for installation on the 5L and 10L units.  Vent pipe attaches directly to the unit in 16L models. 
For more information check here.

Marey FAQ


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





Item Description


The smartest hot water solutions for the whole house.

  • Compact design saves: space and allows for easy installation just about anywhere.
    The tankless heater can heat an 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 years warranty.



Marey since 1955


Marey GA16 NG ETL 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.

Can last a lifetime, keeping up to 82% efficiency level.  Rustproof, no water loss due to leaks.  The tankless heater saves water and up to 60% in the water heating bill than conventional tank water.
Metallic color cover.
Digital Panel showing output water temperature.

CE and ETL approved.

The tankless heater that has smart technology that avoids the excess temperature waste to any hot water point of use.

The only one in the market that doesn't get sediments.
German technology.
Patent design heating elements (long life time).
Patent and innovative technology.
TPCS thermodynamic cycle system.
Terminator of the limescale.
Aluminum magnesium alloy casting body.
Stainless steel aqueduct.
Imported stainless steel.
Insulated heat-conducting magnesium powder.
Nickel-chromium heating element.


Technical Specifications







Contact a professional for you installation questions.


for the Marey Heater Corp.


You may cancel your order before we place the shipping instructions with the warehouse. Normally we will send you a "Thank You" message informing you that we are placing the order. If you need to cancel you must respond to that message and request the cancellation. Once the order has been placed, paid for and shipping directions given to the warehouse your order can not be cancelled.


  • Model: REFGA16NGETL
  • Shipping Weight: 40lbs
  • 5 Units in Stock
  • Manufactured by: Marey

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This product was added to our catalog on Thursday 15 December, 2016.

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