Please note that Scratch and Dent models may be used and refurbished to working conditions and may include wear and tear or cosmetic defects

*All Open Box & Scratch and Dent models are tested to original working condition and come with their original manufacturer warranty.

The Eccotemp 20HI Indoor Natural Gas Tankless Water Heater is one of the largest indoor models of the Eccotemp tankless line. Rated at an impressive 6.0 gallons per minute (GPM) and 150,000 BTU per hour, the Eccotemp 20HI-NG can meet all the hot-water needs of a standard home or apartment with one or two bathrooms, as well as smaller commercial applications. The compact, wall mounted Eccotemp 20HI-NG is powered by natural gas. The Eccotemp 20HI-NG is ready to install with its 110/120-volt UL listed power cord powering the internal exhaust fan and digital display. With its fully automated control system, the Eccotemp 20HI-NG only pulls about .6 amps during operation, making it an ideal choice for any standard-sized home.

Product Features:

Rated for 2-3 applications used simultaneously means that taking a shower and running two sinks at the same time is effortless. The Eccotemp 20HI is ideal for normal hot water heating applications in ANY size residential single-family home.
Best in class 10-year product warranty offers peace of mind that the Eccotemp 20HI will withstand the time and use you need. The Eccotemp 20HI 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.
Rated at 6.0 GPM at 150,000 BTU with a temperature rise of 38 degrees this ultra-efficient tankless water heater is ideal for just about every single-family home in the US and Canada. With Advanced incoming and outgoing water temperature sensor technology, you always have total confidence when it comes to safety.
CSA certified for installation in the US and Canada. This tankless water heater meets and exceeds all safety and efficiency requirements according to the DOE. With an Energy Factor Rating of .83, you can have peace of mind knowing this tankless water heater is ideal for individuals looking to save money.
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 demand needs. Easy, affordable 3” stainless steel venting makes the Eccotemp 20HI tankless water heater economical and affordable to install.

What's Included:

20HI Indoor Natural Gas Tankless Water Heater
110/120-Volt UL Listed Power Cord
Gas Shut-Off Valve
Instruction Manual
Installation Hardware
10 Year Heat Exchanger/5 Year Parts Warranty

Installation Clearances:

The water heater must be installed on a fire-retardant area and must be away from all flammable materials. Clearance should be 1.75 ft to the left and right side of flammable materials, and 6.75 ft to the front.
2" clearance from wall
1' on both sides (left and right) from anything flammable
3' from any window, overhang, awning
18" from the ground

20HI Product Info and Manual
20HI Warranty

The Eccotemp 20HI has been tested for use at elevations up to 2000 feet. Installation and use of the Eccotemp 20HI above 2000 feet may effect overall product efficiency and performance.

IMPORTANT NOTE: Cannot be used for HYDRONIC SYSTEMS, RECIRCULATING, or FLOOR HEATING.

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.

All purchases valued at $75 or above will be shipped with SIGNATURE REQUIRED. If you wish to remove the SIGNATURE REQUIRED please contact Customer Service. Please Note: By opting out of SIGNATURE REQUIRED, you release Eccotemp from all liability of lost or stolen packages. Call 1-866-356-1992 or chat with us here to speak with a customer service agent.

table format

10 Year Limited Manufacturers Warranty - Heat Exchanger, 5 Year Limited Manufacturers Warranty - Parts

Product Description

Please note that Scratch and Dent models may be used and refurbished to working conditions and may include wear and tear or cosmetic defects

*All Open Box & Scratch and Dent models are tested to original working condition and come with their original manufacturer warranty.

Rated for 2-3 applications used simultaneously means that taking a shower and running two sinks at the same time is effortless. The Eccotemp 20HI is ideal for normal hot water heating applications in ANY size residential single-family home.
Best in class 10-year product warranty offers peace of mind that the Eccotemp 20HI will withstand the time and use you need. The Eccotemp 20HI 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.
Rated at 6.0 GPM at 150,000 BTU with a temperature rise of 38 degrees this ultra-efficient tankless water heater is ideal for just about every single-family home in the US and Canada. With Advanced incoming and outgoing water temperature sensor technology, you always have total confidence when it comes to safety.
CSA certified for installation in the US and Canada. This tankless water heater meets and exceeds all safety and efficiency requirements according to the DOE. With an Energy Factor Rating of .83, you can have peace of mind knowing this tankless water heater is ideal for individuals looking to save money.
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 demand needs. Easy, affordable 3” stainless steel venting makes the Eccotemp 20HI tankless water heater economical and affordable to install.

What's Included:

20HI Indoor Natural Gas Tankless Water Heater
110/120-Volt UL Listed Power Cord
Gas Shut-Off Valve
Instruction Manual
Installation Hardware
10 Year Heat Exchanger/5 Year Parts Warranty

Installation Clearances:

The water heater must be installed on a fire-retardant area and must be away from all flammable materials. Clearance should be 1.75 ft to the left and right side of flammable materials, and 6.75 ft to the front.
2" clearance from wall
1' on both sides (left and right) from anything flammable
3' from any window, overhang, awning
18" from the ground

table format

Show Less

Smart Home 6.8 GPM Outdoor Tankless Water Heater, SH22 Series

"Great value. If you compare the features with any other brands, you will not find another value. I’ve been extremely impressed with this unit."

- Adam V.
6.8 GPM Indoor Tankless Water Heater, 45 Series

"Saved The Day! We had a very old water heater that was notorious for taking 1 minute to get hot in the shower, the 45HI-NG has the shower hot in 10 seconds! Thank you Eccotemp!"

- Tyler C.
Smart Home 2.5 Gallon Electric Mini Tank Water Heater

"Great price, fast delivery. I installed the unit under the kitchen sink. From opening the box, plumbing and connecting via Wifi were no more than 60 mins. I'll monitor the daily KW usage. Strongly recommend trying this unit."

- Wade T.
L5 1.5 GPM Portable Outdoor Tankless Water Heater

"We love ours. Imagine cool weather with muddy 4 wheelers, muddy dogs, muddy kids, & gear...well that would destroy a normal weekend but not ours. We love taking warm showers and cleaning up with ours! It truly has been a game changer."

- Mark F.
Builder Series 6.0 GPM Indoor Tankless Water Heater

"Cannot be happier with this water heater. My family came home from a long weekend and we all were in desperate need for showers. Family of five showered back to back with no issues. Thanks for making life that much easier!"

- Ron S.
Smart Home 6.8 GPM Outdoor Tankless Water Heater, SH22 Series

"Works great. Love it, does great for a family of 4, love the app and how you can adjust temp from phone. Works great for younger kids."

- Redd
Under Sink EM-7.0 Gallon Electric Mini Tank Water Heater

"This guy recuperates in 20 minutes or less... Easily installs and works on 120 volts with very low power consumption and you do not have to wire up for high amps or a 240 line. I highly recommend this unit."

- Louis G.
Luxé 3.0 GPM Portable Outdoor Tankless Water Heater

"Quickly heats water. I like the thermostat with digital reading of water temperature. Has ample pressure and never ran out of warm water rinsing my horse whose reaction was that he liked the warm water."

- Betty S.
6.8 GPM Indoor Tankless Water Heater, EL22 Series

"Great buy! Great purchase! Installation was quick and easy. Highly recommend!"

- John C.
4.0 GPM Indoor Tankless Water Heater, i12 Series

"I installed the unit a month ago with some fantastic tech support. Over all I am very happy with the performance of the heater and would recommend this unit to anyone."

- Marc D.
Smart Home 2.5 Gallon Electric Mini Tank Water Heater

"Look and size of the hot water heater is perfect if you are adding this to a work shop or bathroom. This water heater uses Wi-Fi so you can connect to Alexa and ok Google. Very nice packaging and very clear, easy to follow directions."

- Matt
Luxé 1.85 GPM Portable Outdoor Tankless Water Heater

"Great Portable Water Heater. Delivers functionally and aesthetically. Very easy to set up and came with everything I needed. Well constructed and I like that I can easily see the water temp. Look forward to years of use."

- ARS