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Product Information

 Eccotemp FVI12-NG 

The Eccotemp FVI12-NG Tankless Water Heater is a natural gas fired, indoor tankless water heater designed for small to medium hot water production where you need more than one hot water application at the same time and is perfect for vacation cabins, cottages, and smaller homes. The FVI12 offers a 45-degree Fahrenheit temperature rise when operating at maximum flow capacity and a 77-degree Fahrenheit temperature rise at 2.3 GPM. Included in the box is a horizontal stainless steel vent kit, ready to install. The Eccotemp FVI12-NG's 110 volt UL listed power cord powers the internal exhaust fan and digital display. It only pulls approximately 2 watts idle and 10 watts during operation, making it ideal when energy conservation is paramount. 

Eccotemp FVI12 Product Manual

Some additional Features:

  • Sleek modern design
  • Digital temperature display
  • True 1/2" NPT water fittings
  • Manual water temperature controls
  • Natural Gas Powered
  • 4 GPM flow capacity
  • Power ventilation for safety, efficiency, and venting options
  • Tested-Safe Electronic ignition system
  • Fully independent gas and water controls
  • Precise temperature and water flow adjustment
  • Uses gas only when hot water is on
  • Requires standard household 120-volt electric outlet
  • UL listed electrical components
  • Energy factor: 79%
  • Hot water capacity range: 0.93 - 4.8 GPM
  • Maximum / Minimum gas rate: 25,000 to 74,500 BTUs

Eccotemp FVI-12 NG Dimensions:

  • Height 24.75"
  • Width 15.25"
  • Depth 6"
  • Weight approx. 33 lbs.
  • Shipping weight 34.7 lbs.

What’s Included:

IMPORTANT: This product should also not be used with a bilge pump. 

Please Note: Failure to clean and descale your water heater quarterly can result in lime and sediment build up within the heater, which can void your warranty! We recommend using our Eccotemp EZ-Flush System Descaler Kit to ensure a clean, energy efficient, long lasting heater!  Click here for details.


Availability: Usually ships within 1 to 5 business days
Current Stock:
Condition: New
Power Type Natural Gas (NG) Applications Cabins Applications Apartment/Townhome Installation Indoor Flow Rate 3.6 GPM Color White
Width: 15.50
Height: 25.00
Depth: 6.00
GTIN: 00891876002096
Bulk Discounts: Buy 2 - 10 and get 10% off

Customer Reviews 5 (1 Review) Write a review of this product

5 Stars
A Super Value and Very Well Made!!!

As a Responsible Master Plumber in the State of Texas, I have installed tank type for years and recently now tank-less. I installed two electric tank-less that I liked and my customers liked. For a small household they were great and one of the customers insisted on electric. 50 amp double pole breaker was required. I purchased some of the Eccotemp LP models and one has gone to Taos, New Mexico to an Earthship project there and I kept one here for emergency hot water. (we had two hurricanes and hot water is a very nice thing to have. cold showers are not fun, but doable) Ok I am rambling. I installed the Eccotemp FVI12-NG tankless on Monday of this week. I was really amazed at the high quality and high workmanship. My customer waited an entire week for me to return from out of town and was extremely pleased when her new unit arrived. It is very nice and worth more money than Eccotemp ask for them. The install took just a little longer but the next will take me less time than a tank type. I am giving her a week to try it but I believe she is very pleased. She gained lots of room in her garage and it works great. I had her test every hot-water outlet in her home and she was getting about 108 to 113. I showed the controls and explained she may need to turn it up some in the winter. Everything was in the kit. (except pressure relief valve)but you must install on exterior wall or corner near exterior to use the stainless steel vent pipe that is included. Make sure the vent pipe slopes down slightly. (the hot gas condenses on it and the liquid is acidic and needs to drain away from the unit. I will buy more and I will install more. I will work on modifying vent system but you must use stainless, no substitutes allowed. Great Job EccoTemp.