4.0 GPM Indoor Natural Gas Tankless Water Heater, i12 Series

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Product Description:

The Eccotemp i12 Indoor Natural Gas Tankless Water Heater is one of the most advanced indoor models of the Eccotemp tankless line. Rated at an impressive 4.0 GPM with a temperature rise of 38 degrees and 80,000 BTU per hour, the Eccotemp i12-NG can meet all your hot-water needs! Eccotemp’s advanced 0.7 GPM low flow ignition technology allows users to enjoy endless hot water without experiencing cold spots.

We recommend the Eccotemp i12-NG for smaller sized single-family homes, apartments, condos, and cabins as well as small commercial applications. Using 1-2 hot water applications simultaneously is a breeze with the Eccotemp i12-NG. With our upgraded PCB (Product Control Board) performance and an all new gas modulating valve, consumers can experience best in class temperature performance with a price anyone can afford.

The compact, wall mounted Eccotemp i12-NG has a 110/120-volt UL listed power cord that powers the internal Exhaust Fan, Digital Display and PCB. With its fully automated control system, the Eccotemp i12-NG only pulls about .5 amps during operation, making it an ideal for low energy consumption and efficiency.

The Eccotemp i12 has been tested at elevations up to 2000 feet. Installation and use of the Eccotemp i12 above 2000 feet may affect overall product efficiency and performance. Installation and use of the Eccotemp i12 above 5000 feet is not recommended.


  • Rated for 1-2 applications used simultaneously means that taking a shower and running two sinks at the same time is effortless. The Eccotemp i12 is ideal for hot water heating applications in smaller sized residential single-family home, condo, cabin, apartment, or Light commercial use
  • Rated at 4.0 GPM at 80,000 BTUs with a temperature rise of 38 degrees, this ultra-efficient tankless water heater is ideal for just about every single-family home
  • Advanced Generation 3 Computer board with high performance processing and smart adjust technology built in. Our proprietary developed programming meets and exceeds today’s consumer demands
  • With advanced incoming and outgoing water temperature sensor technology, you always have total confidence when it comes to safety
  • Limited Manufacturer Warranty (Heat Exchanger: 5 Years, Parts: 2 Years, Free Accessories - fittings, accessories, hardware pack, etc.: 30 days), live chat, appointments for product support, self-help guides will give you peace of mind that the Eccotemp i12 will keep you in hot water for years
  • What's Included: i12-NG tankless water heater, wall thimble, 18” straight pipe, mounting hardware, and installation manual
  • The Eccotemp i12 can be complemented with our patented one of a kind EZ-Flush descaling kit to ensure your tankless water heater is running at maximum efficiency all year long

Product Features

  • Energy Efficient

  • Easy Install

  • Glass Panel

  • LED Screen

  • Touch Screen

Smart Voice Commands

Designed with a smarter home in mind

”Ok Google, change my water heater to 110 degrees.”

Connects seamlessly with Google and Alexa

”Alexa, change my water heater to Comfort Mode.”

  • Ultra-Efficiency and Affordable Comfort

    The Eccotemp i12 is a 4 gallons per minute 75,000 BTU, Gas Indoor Tankless Water Heater.

    It features a state of the are exhaust system that when paired with Eccotemp 3" stainless steel vent kit, allows you to install the i12 indoors easily and safely.

  • Revolutionary Display Design

    This beautifully designed tankless water heater features a black tempered glass front casing and LED touch controls. The display shows output water temperatures and water flow to ensure a precise setting for everyone.

  • Engineered for DIY

    The Eccotemp i12 Indoor Gas Tankless Water Heater features 1/2" NPT incoming and outgoing water connections. Designed for compatibility with most standard size plumbing makes installing the i12 easy, straight forward and affordable.


  • Mid Size Home

  • Town Home

  • Apartment/Condos

  • Office

  • Tiny Home

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  • Rated Flow Rate

    4.0 GPM

  • Installation


  • Gas

    Natural Gas

  • Color


  • Amps

    0.5 Amps

  • Model


  • BTU


  • Power Type


  • Temperature Range


  • Water Connection

    1/2" NPT

  • Gas Connection

    1/2" NPT

  • Warranty

    2 Years

  • Weight

    21.8 lbs

  • Product Dims


  • Packaging Dims


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