Marey GA10NGDP 3.1 GPM Tankless Water Heater Open Box

  • Model: Marey
Marey GA10NGDP 3.1 GPM Tankless Water Heater Open Box

In Stock
Ships Same Day
If ordered by 12PM EST
  • Free Shipping Options Available
  • No Sales Tax *Except TX*
  • Price Match On Most Items
  • Manufacturer Direct
  • Exceptional Customer Service
  • Free Replacement Shipping
To place an order over the phone or for immediate assistance, please call (888) 978-4993. For after hours sales please call (888) 999-1522.

Open box - As brand new.   Most open box units are returns that have never been used.  Ships from the manufacturer in FL.  Includes same 5 year warranty as new units. For an expedited shipping quote, please give us a call.

Transit time for most orders: 1-3 days

Manufacturer Refurbished 100% certified by the manufacturer
Manufacturer Refurbished Guaranteed to work like new or your money back
Manufacturer Refurbished 5 year manufacturer warranty
Manufacturer Refurbished Authorized Marey dealer
Manufacturer Refurbished Ships out same or next day

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.
  • Multiple points of use.


  • 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


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.

Marey products come with a 5 year manufacturer warranty.

Customer Reviews

Based on 6 reviews
no happy

It didn't work at first than it did and was happy. That only lasted for a minute it doesn't want to light up. Viewed the youtube video still does not light up. Disappointed with product.


Fast delivery, product functions as expected.

Marey tankless water heater

Very simple compare with my 3yr old Rheem tankless with electronic board control now stop working, Marey work with battery doesn't depend on 110v ,in case of storm no power I still have hot water, need to play with control valves, manual doesn't help much ,overall good system no stupid electronic control

Happy with my water heater

I'm very happy with my tankless water heater needed to purchase some extra parts to install but all and all very happy with it and water is hot!

Smooth Transaction

Shipped on time and quick. Thumbs up!

Used & Refurbished

Thousands of units sold with very happy customers and feedback

Used & Refurbished

Refurbished products come directly from the manufacturer, so you can be certain of the quality

Used & Refurbished

Refurbished products are restored by the manufacturer to the same rigorous standards as those set for new products

Used & Refurbished

We offer extended in-home warranties that can be longer than the manufacturer warranty for new items

Used & Refurbished

Each unit is individually tested for performance, whereas only a small subset of new units are tested

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