Marey GA14CSANG 3.7 GPM CSA Natural Gas Tankless Water Heater


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Marey GA14CSANG High-Efficiency CSA Approved 3.7 GPM Natural Gas Tankless Water Heater


Don't let your family run out of hot water ever again.  Experience the joy of on-demand unlimited hot water.

Introducing Marey's newest series of highly efficient gas-fired tankless water heaters.

The GA14CSANG Natural Gas Tankless Water Heater is designed to utilize a maximum gas input rating of 100,000 BTU/hr and boasts an impressive 3.74 GPM (gallons per minute) maximum flow rate. This unit is capable of servicing multiple points of use simultaneously.  It is full of features with upgraded components and state of the art electronics. 

This model is ideal for any mid-size home, apartment, cabin, and small commercial usage.  In addition to state of the art design, the unit comes with a computerized safety system, over-heating protection, flame failure protection, and anti-freeze protection.

It is also CSA certified for the US and Canada markets.

UPC: 764177000934

Authorized Dealer








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 most popular points 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.


Product Information

  • Designed to effectively supply endless and on demand hot water for 1 or more multiple points of use
  • The unit has no pilot light and consumes no gas when the heater is not being used
  • Multiple built in safety features:
      -   Overheating Protection
      -   Anti-block protection
      -   Flame-failure protection
      -  Anti-freeze protection
  • Oxygen Free Heat Exchanger
  • Screen Touch precise temperature control
  • Compact design allows installation in almost anywhere at home
  • Must be installed by a professional plumber or electrician to ensure safety and quality

Points of use according to US region

  • North – up to 2 points of use (1 shower + 1 sink) or (2 sinks)
  • Central – up to 2 points of use (1 shower + 1 sink) or (2 sinks)
  • South – up to 3 points of use (2 showers + 1 sink) or (2 sinks and one shower) or (3 sinks)
  • Extreme South – same as South

Flow Rates

  • Flow Rate @ 35°F Rise 4.6 GPM
  • Flow Rate @ 45°F Rise 3.6 GPM
  • Flow Rate @ 55°F Rise 2.9 GPM
  • Flow Rate @ 65°F Rise 2.5 GPM
  • Flow Rate @ 77°F Rise 2.1 GPM

Temperature Range - Maximum Temperature (F) - 140 F - Minimum Temperature (F) - 95 F




Outstanding Features

  • CSA Certified
  • LED Touch Screen
  • Computerized Safety
  • Maximum Flow Rate 3.7GPM
  • High Efficienty
  • Flow Activation
  • Oxygen Free Copper Heat Exchanger
  • Stainless Steel Venting Exhaust
  • Anti-Freeze Protection
  • Endless Hot Water
  • On-demand Usage
  • Compact, Space Saving
  • Energy Conservaton
  • Only uses energy while hot water is flowing
  • Requires very little water pressure to activate
  • Excellent customer service support and 5 year warranty

Technical Specifications

  • BTU/h:
     - Minimum: 20,000
     - Maximum: 100,000
  • Gas Connection: 1/2" NPT
  • Water Connection: 1/2" NPT
  • Water Pressure* psi(MPa): 15-150 (0.1 - 1)
  • Natural Gas Inlet Pressure - W.C. (kPa):
     - Max 7.0 (1740 Pa)
  • Net Weight: 35.27 lbs - 16 kg
  • Dimensions:
     - inch: H 25.95" X W 13.89" X D 5.62"
     - mm: H 659 X W 353 X D 142
  • Ignition: Electric Ignition
  • Supply: VAC / Hz: 120 / 60
  • Voltage: 110/120
  • Consumption
     - Rated Power - W/A: 34.5
     - Stand by - W/A: 3/ 0.15
     - Freeze-Protection - W/A: 100- 0.85
  • Water Heater Category ** : Category III
  • Effeciency Ratings: 0.83 Uniform Energy Factor
  • Vent diameter (in.) - 3 in.
  • Vent Type -stainless steel
  • Minimum Flow Rate: 0.65 GPM
  • Pressure rating (PSI): - 0.3974 PSI
  • Temperature range:
     - Minimum: 95°
     - Maximum: 140°
  • Installation type: Indoor wall hung
  • Water Connection Location: Bottom



Our eco-friendly tankless water heaters are energy efficient and designed with the latest in water heating innovation technology.

Marey makes it easier to protect the environment for future generations with sustainable and efficient tankless water heating solutions for your home.

Marey’s limited warranty is comprehensive and covers all manufacturer defects.

The following cannot be covered under warranty:

  • physical damage or damage caused during installation
  • exposure to extreme climate conditions
  • dismantled interiors
  • .

You must follow the recommended installation instructions when installing the device. Installation of units must comply with all local building, plumbing and electrical codes and installed by a licensed plumber or electrician.

Our warranty coverage includes replacement parts and repair labor for the first year in our Service Center. After the first year, only the replacement parts will be covered. Refunds are not available under the warranty. Warranty repairs must be done at our certified Marey Service Center (the customer is responsible for return shipment).

In the event that warranty repairs are needed, please contact Marey directly at 1-855-627-3955 or email customerservice@marey.com for instructions.

Product suitability: Many jurisdictions have specific codes and regulations governing sales, construction, installation, and/or use of products for certain purposes, which may vary from those in neighboring areas.

While Marey attempts to assure that its products comply with such codes, it cannot guarantee compliance, or be responsible for how the product is installed or used. Before purchase and use of a product, please be sure to review the product applications, and all applicable national and local codes to verify that the product, installation and use will comply with them.

WARNING: Damage to the unit or residence caused by exposure to freezing temperatures is not covered under warranty. Responsibility for this type of damage is disclaimed by Marey International LLC and Marey Heater Corporation. Please refer to your instruction manual on how to avoid exposing your unit to freezing temperatures.



  • 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, contact us for a quote.
  • 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.
  • 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.



To help us expedite your return please follow these instructions:

  • Units must be in new unused condition the same as when shipped from the warehouse.
  • 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 International, LLC.
  • You will then receive your refund after a Marey International, LLC 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.

*Free Return Shipping only available on units with actually manufacturer defects.

Refunds will not be issued on products that have been broken or damaged! Product defects are covered by Marey International, LLC's Warranty as verified by the manufacturer.

  • Buyer must consult with a Marey International, LLC Service Technician and the unit deemed to have a factory defect.
  • Units not functioning properly due to "customer set up" DO NOT qualify as a manufacturer's defect.
  • Returned units that have been damaged by buyer will be subject to restock fee or possible rejection of return claim.

  • Model: GA14CSANG
  • Shipping Weight: 41lbs
  • 0 Units in Stock
  • Manufactured by: Marey

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This product was added to our catalog on Saturday 15 August, 2020.