Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box

Manufacturer: Marey


  • Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box
  • Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box


$ 199.00

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Product Overview

The compact and easy-to-install 10L Natural Gas Tankless Water Heater 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 versatile 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 45 degrees Fahrenheit.

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5 year factory warranty


100% certified by the manufacturer


Ships directly from Marey out of FL


Authorized Marey dealer

Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box

Marey GA10NG 3.1 GPM Natural Gas Tankless Water Heater Open Box


  • Saves water and up to 60% less electricity than conventional tank water heater, making it cost-effective and environmentally friendly.
  • Rustproof, no water loss due to leaks.
  • Compliant with Department of Energy gas tankless water heater requirements
  • 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
  • Excellent customer service support and 5 year warranty


Manufacturer's Warranty5 Years
Hot Water Outlet per Minute10 LPM / 3.1 GPM
Heat Loss79,228 BTU/h
Min. Water Pressure Activation20 PSI
Maximum Flow Rate3.1 GPM
Dimensions13.6" x 23.6" 6.9"
Gas TypeNatural Gas
Safe Operating Pressure5 - 140 PSI
Related Gas Pressure.25 up to .5 PSI
Exhaust DischargeFlue Duct Type
Applicable Water Pressure3.6 - 145 PSI
Ignition2D Cell batteries (not included)
Energy Efficiency54% - 87%

Package Contents

Tankless Water Heater

User Manual


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authorized dealer

This item comes with a 5 year factory warranty.

Manuals & Documentation

Customer Reviews (10)

Customer Reviews

Janet Inkster
Marey is Marvelous :)

I've wanted to go tankless for some time. The "name" brands are a bit pricey and I was told that I would have to increase the size of my gas line and upgrade my circuit panel - all of which was going to cost me thousands. I shopped around any came across the Marey tankless for less than $200. It only needed a 1/2" gas line and the ignition was 2 D batteries. Installation was simple and my final cost was less than $250. If a 76 year old woman (which is what I am) can do it, anyone can!! It's been working flawlessly since I installed it. The bottom line is: I'm one very satisfied and very happy customer and give this product 5 stars - I'd give it 10 if I could :)

Jamie Davis
Tankless water heater

well so far so good, haven't really put it to the test yet, due to the house being vacant ,but have high hopes.. thanks

jonathan berkhoudt
Lower Water Pressure for Hot H20

The unit was very easy to install. Simple instructions and videos for help. I may have spent $120 in Pex, Shark bites, and some other tools/supplies. The Unit did not kick on right away, we would have to turn a secondary faucet on to kick the unit on. Then it would heat up very nicely. Some times, the water would not get "HOT" ( above 130 degrees, roughly estimating) unless I turned the control on the unit down for the volume of water. The customer service was above par, as today I called explaining I had lost my manual and wanted to perform some maintenance. Upon inspection afer removing the cover, I noticed the 2nd igniter was broken. The service rep explained what is was and what it did, along with a possible future piece that may need replacing ( a water valve is missing a screw, it is on the bottom near the cold water intake adn hass a drip every 20 minutes or so.) and he suggested to get one of them now as well. The unit is covered under warranty still, it is 2 years old out of the 5 year warranty. Th rep also explained the 3 options for shipping and costs. for $12 I should have a part by Tuesday, but perhaps as early as Saturday ( it is December 17th and all postal services are busy) . I would love to rate this higher, but I cannot. I recommend buying the next stronger sized unit, mine is the 3.1 L ( we have 1 kitchen, 1 bath and the basin sink/laundry hook ups.)

June Fabian

Gave as a gift and they think it’s a good product. Would recommend to anyone who needs a waterless Hester.

Paul Smith
Marey tankless water heater

It arrived in a reasonable amount of time, it was easy for my step-son (a plumber in training) to install, and so far it's working great!

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