Eccotemp i12-NG Tankless Water Heater
- 3 GPM rated flow, whole home indoor use
- Natural gas, electronic ignition, no pilot light
- 110v outlet plug, UL-listed cord
- 1/2 inch NPT water fittings
- Horizontal vent kit included, wall mount
- 5500 ft elevation field tested, not advised higher
- 2 year limited warranty
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A wall-mounted natural gas tankless heater with on-demand firing, a glass LED control panel and venting in the box. Flow figures differ across the listing, so confirm the rating against your household demand.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B0157EJTQYModel: i12-NGCategory: Water Heaters
Overview
Electronic ignition lights the burner only when hot water is called for, so the Eccotemp heater runs without a standing pilot flame. Temperature is set on an LED display behind a black tempered glass panel, and the unit hangs on a wall with horizontal venting.
On-demand heating and automatic temperature control reduce the energy a standing pilot would burn. Child lock and an energy saving mode add sensible control for families. The listing gives two different flow figures, and the unit needs both a gas line and a nearby outlet.
Who it's for
Homeowners with a natural gas supply and an indoor wall near an outlet can add on-demand hot water with this compact unit. Propane households, outdoor installs and homes at high elevation are outside what the listing supports.
Pros and cons
- Fires on demand, no pilot light
- Tempered glass front with LED controls
- Child lock and energy saving mode
- Horizontal vent kit in the box
- Flow rating differs between listing fields
- Natural gas only, no propane option
- Needs an electrical outlet near the wall
- Vertical venting kit not listed
Performance notes
Output depends on how far the incoming water must be raised in temperature and how many taps run at once, since a tankless burner heats only what flows through it. Electronic ignition fires on demand, so there is no stored hot water to run out, only a flow ceiling.
Specifications
| Brand | Eccotemp |
|---|---|
| Model | i12-NG |
Frequently asked questions
How big is the Eccotemp i12-NG?
It is listed at 16 inches wide, 11 inches high and 16 inches deep, for mounting on a wall indoors.
Can the Eccotemp i12-NG run on propane?
This listing is the natural gas version. No propane conversion is mentioned, so a propane home needs a different model.
Does the Eccotemp i12-NG need electricity?
Yes. It plugs into a standard 110v outlet with a UL-listed cord, which serves its electronic ignition and controls.
Can the Eccotemp i12-NG be installed outdoors?
The listing describes a whole home indoor heater with horizontal venting and does not cover outdoor installation.
What is included with the Eccotemp i12-NG?
The heater, a horizontal vent kit, installation hardware and an instruction manual.