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Marey GA10NGDP 3.1 GPM Natural Gas Tankless Water Heater Open Box

Manufacturer: Marey


  • Marey GA10NGDP 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NGDP 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NGDP 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NGDP 3.1 GPM Natural Gas Tankless Water Heater Open Box


$ 189.00

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Marey GA10NGDP 3.1 GPM Natural Gas Tankless Water Heater Open Box

Marey GA10NGDP 3.1 GPM Natural Gas Tankless Water Heater Open Box

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 Refurbished100% certified by the manufacturer
Manufacturer RefurbishedGuaranteed to work like new or your money back
Manufacturer Refurbished5 year manufacturer warranty
Manufacturer RefurbishedAuthorized Marey dealer
Manufacturer RefurbishedShips 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 (11)

Customer Reviews

Based on 11 reviews
See all reviews
it's good for the price but a bit weird with the venting

the stater is battery powered which is weird bc if the battery runs out, then the heater wont start. also you have to let the air out of the valve before the heater will turn on, definitely not DIY model. even my plumber had a bit of issues getting it to work.

aaron black
epic water heater

works well, takes a little tuning, but instillation was easy and efficiant , great price as well

Michael Joyce

Marey GA10NGDP 3.1 GPM Tankless Water Heater Open Box

RoyL Miliner
A Great Straight Forward Product

I actually replaced another brand Tankless Water Heater with the Marey. The hardest part of the installation of the Marey was removing the existing heater. The videos that Marey provides showed me that I could do the install myself and it was true for me. The Tankless heater that I replace as was major name brand and it was really complicated to service and the replacement parts were really pricey. I was ready for a change in instead of another repair of my existing unit. Since I was replacing an existing unit nearly everything was already there so once I got the old unit out install the Marey was easy once I got the right length replacement flex hoses install. It started right up when I turned the gas and water back on and all I did after that was adjust the temperature setting. I wish I had found out about this product years ago.

Monica Taylor
hot on demand

this is the second marey that i bought and it was xlnt as expected the price however was amazing and with all the quality of a closed box why pay more

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