Description
Description
Eccotemp SmartHome Indoor 4.0 GPM Natural Gas Tankless Water Heater, SH12-A Series
Product Description
Enjoy continuous, on-demand hot water with the Eccotemp SmartHome SH12-A-NG Indoor Natural Gas Tankless Water Heater. Delivering up to 4.0 GPM, this compact system combines energy-efficient water heating with Wi-Fi connectivity, mobile-app controls, and smart-home voice commands.
Designed for small to medium-size households, the SH12-A-NG is suitable for smaller single-family homes, townhomes, condos, cabins, apartments, and light commercial applications. Its wall-mounted design saves valuable floor space while supplying hot water for one to two applications.
- Delivers up to 4.0 GPM at 80,000 BTU with a 35°F temperature rise
- Rated for one to two applications
- Provides an adjustable temperature range from 95°F to 140°F
- Operates with natural gas
- Heats water only when needed to eliminate standby heat loss
- Connects to the Eccotemp mobile app through Wi-Fi
- Adjust temperatures, create schedules, and monitor energy consumption
- Detects product and network errors
- Sends maintenance alerts
- Eco Mode can help reduce energy consumption by up to 25%
- Supports Amazon Alexa and Google Home voice commands
- Smart Power Button controls power, error detection, wireless connectivity, and sleep mode
- Compact, wall-mounted design fits in tight spaces
- Includes freeze protection
- CSA certified for installation in the United States and Canada
- Tested and approved for elevations up to 2,000 feet
- Compatible with separately sold 3-inch horizontal and vertical indoor venting kits
Important: This product cannot be used with hydronic systems, recirculating systems, or floor heating. Professional installation is required. Installation above 2,000 feet may affect efficiency and performance.
Specifications
| Specification | Details |
|---|---|
| Brand | Eccotemp |
| Model | SH12-A-NG |
| Rated flow rate | 4.0 GPM |
| Installation | Indoor |
| Fuel type | Natural gas |
| Heating capacity | 80,000 BTU |
| Temperature range | 95°F–140°F |
| Rated applications | 1–2 applications |
| Rated temperature rise | 35°F at 4.0 GPM |
| Water connection | 1/2-inch NPT |
| Gas connection | 1/2-inch NPT |
| Power type | AC |
| Power requirement | 120V |
| Amperage | 0.34 amps |
| SmartHome enabled | Yes |
| Connectivity | Wi-Fi |
| Smart-home compatibility | Amazon Alexa and Google Home |
| Material | Steel |
| Color | White |
| Freeze protection | Included |
| Venting | 3-inch horizontal or vertical vent kit, sold separately |
| Certification | CSA |
| Approved elevation | Up to 2,000 feet |
| Energy Guide estimate | $199 per year |
| Heat exchanger warranty | 5 years |
| Components/parts warranty | 2 years |
| Parts/accessories warranty | 30 days |
What’s In The Box?
- Eccotemp SmartHome 4.0 GPM Indoor Natural Gas Tankless Water Heater (SH12-A-NG)
- One hardware pack
- One product manual
FAQs
What type of fuel does the Eccotemp SH12-A-NG use?
The SH12-A-NG is designed to operate with natural gas.
How many applications can this water heater support?
The product page rates the SH12-A-NG for one to two applications.
Can the water heater be controlled remotely?
Yes. The Eccotemp mobile app lets users adjust temperatures, set schedules, track energy consumption, and detect product or network errors.
Does the SH12-A-NG support voice commands?
Yes. It can connect with Amazon Alexa and Google Home for supported voice-command functions.
Is an indoor venting kit included?
No. Compatible 3-inch horizontal and vertical indoor venting kits are sold separately.

















