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Rheem EcoSense

Model # ECO180XLN3

Internet # 203213758

Store SKU # 486311

8.4 GPM Natural Gas Mid Efficiency Outdoor Tankless Gas Water Heater

This item has been discontinued.
The Home Depot no longer carries this specific product.

$749.99 /each
  • No standing pilot means less wasted energy
  • Compact space saving design frees up valuable square footage
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.




Model # ECO180XLN3

Internet # 203213758

Store SKU # 486311

Store SO SKU # 1000067409

The Rheem EcoSense ECO180XLN3 Outdoor Natural Gas Tankless Water Heater can provide up to 8.4 GPM at a 35° temperature rise. The 180,000 BTU Natural Gas Tankless Water Heater is designed to supply continuous hot water for up to 2 or 3 bathrooms at the same time. It heats water only when it's needed and has a 0.82 energy factor. This compact heater exceeds the requirements for many utility rebate programs and also qualifies for the Energy Star program. It comes with a remote digital thermostat that can be installed in almost any convenient area of the house. This heater's outdoor design requires no additional venting and features freeze protection to -30°F. This model can be used at elevations up to 9,840 ft. above sea level. Please click the "More Info" tab and then "Specifications" to view the Rheem Brochure Guide which will help you in your buying decision to ensure that you purchase the right tankless water heater model for your household needs.

  • Outdoor tankless gas water heaters require no additional venting
  • A 8.4 GPM tankless water heater at a 35° temperature rise can provide enough hot water to supply a 2-3 bathroom home
  • Tankless gas water heaters heat water on demand, saving energy compared to many standard gas tank-type water heaters
  • 12-year limited warranty on heat exchanger and 5-year limited warranty on parts
  • 0.82 energy factor meets or exceeds minimum energy efficiency standards
  • Remote digital display shows precise temperature setting and maintenance codes
  • Ability to link two like units together for high demand applications with the EZ-link cable (sold separately)
  • Note: product may vary by store
  • Modulating Control adjusts power consumption to meet the required hot water / temperature flow rate

    How to Choose Your Rheem EcoSense Tankless Electric

    Choose your application, ie. shower, bath tub or vanity sink-faucet, kitchen sink faucet or washer. See chart below.

    For example: you choose a kitchen sink faucet.

    See application chart below and locate your flow rate. For example: your flow rate is 1.5 gpm.

    On the map, locate the average water temperature in your area.

    For example: your water temperature (in Atlanta) is 55°

    Use the water temperature and flow rate chart to determine the model you need.

    For example: 1.5 gpm flow rate + 55° = RETE 9.

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Vent diameter (in.) 
Water Connection Size (in.) 
Automatic Shut-off 
Finish Family 
Flow Rate @ 35 F Rise (gallons/min) 
Flow Rate @ 45 F Rise (gallons/min) 
Flow Rate @ 55 F Rise (gallons/min) 
Flow Rate @ 65 F Rise (gallons/min) 
Fuel Type 
Gas Connection Size 
Gas Product Type 
Commercial & Residential 
Gas Type 
Natural Gas 
Gas Type 
Natural Gas 
Maximum Temperature (F) 
Minimum Activation Rate (gpm) 
Minimum Temperature (F) 
Pilot Light 
Product Weight (lb.) 
54 lb 
Residential/Commercial/industrial Use 
Residential or commercial 
Total BTU 
180000 Btu 
Vent Type 
Single Wall 
Water Connection Location 
Water Heater Features 
Ultra LoNox 
Warranty / Certifications
Certifications and Listings 
1-UL Listed,CSA Listed 
ENERGY STAR Certified 
Labor Warranty 
1 Year 
Part Warranty 
5 Year 


Rated 4.1 out of 5 by 8 reviewers.
Rated 5.0 out of 5.0 by Great investment Love it I had it installed because I was already having a bunch of plumbing work done, but it was pretty easy, it does require 120V electrical supply and wiring of the remote. I wanted to gain space in my laundry room and putting the heater outside makes so much sense, no fumes, duct work and if there is ever a leak no damage to your house. I do live in sunny south Florida so freezing is never a worry:) February 25, 2015
Rated 5.0 out of 5.0 by Better than a Bosch-Pro Tankless I have had a Bosch GWH-635-ESO-N for years and wondered what was so good about a tankless water heater. Took a long time to get hot water to the destination, and had cold spots in the hot water line. Started having error codes and would have to reset all of the time, which meant going outside to the unit. My new Rheem has a control panel in the house if I ever need to reset it, I am using much less water because I turn on the hot water tap and get hot water like it is a regular tank unit. I do not have to heat up my hot water prior to plugging in my portable dishwasher and then keep the water running in another faucet so that it doesn't error out and shut the hot water off. I would recommend this product to anyone that wants to go tankless but was worried about wasting so much water because it sends the hot water to the tap so quickly that I am sure my water bill will go down. October 19, 2013
Rated 5.0 out of 5.0 by GAS WATER HEATER Was skeptical about this unit but it is working great. Very efficient. Haven't seen a great increase on my gas bill. March 24, 2015
Rated 4.0 out of 5.0 by Very pleased with this investment I am a do it yourselfer and this was a day job of removing the old electric low boy heater and converting to gas and installing this unit. The ONLY down side is that the cut off valves had to be purchased seperately from a different retail store. June 16, 2015
Rated 5.0 out of 5.0 by Wonderful Love it, still had hot water after 3 people finished showering. Arrived before they predicted. Need to buy cut-off valves for hot & cold water, pressure relief valve, cpvc with elbows for making turn and running lines and small amount of electrical wire to hook up the thermostat. Did it ourselves!!!! Pollie April 16, 2013
Rated 5.0 out of 5.0 by Natural gas tankless Excellent product; installation did take a plumber and electrician, had to redo some pipes and i'm not "handy" at all so hired people to install. Quality and Value; completely satisfied with the product too many cool features and space saving to list; plus excellent rebates for the product!! Highly recommend (location Phoenix, AZ) January 19, 2014
Rated 3.0 out of 5.0 by The tempeture is too low for good hot water. Need to have an factory tech to reset the tempeture to 140 degree. The need to have a Factory Technician reset the tempeture to 140 degree is a lot of trouble. It takes a long time to get the water hot. February 18, 2014
Rated 1.0 out of 5.0 by Horrible Customer Service with manufacturer My local home depot did not have this product in stock. However, they had one in stock 30 miles away and was reduced $300 due to a discontinuation of the product. So we happily drove for the savings. I had a plumber come out and run the lines for both gas and water. I mounted the unit to the wall (as the instructions stated), ran up a 5" diameter pipe 12" prior to the 90 degree bend, then ran the unit outside. The instruction manual states that I may have up to 39" prior to the gas being expelled. I have roughly 8 inches prior to an exhaust system that will not trap water. 5" pipe is ran the entire way. The unit will not produce hot water, only warm water, and only for a few seconds. We called Rheem at 4:30 on Friday and had emailed them a copy of the receipt at 4:50. Their office closes at 6:00. We were told Rheem would send out a technician on Saturday to look at the unit. We call back Saturday AM and are informed that no technicians work until Monday. We were apologized to for being lead to believe we would have someone come on a Saturday. We call back Monday and are told Rheem has no technicians in the area, but if we buy a $90 Rheem ventilation kit the unit will work fine. Unfortunately there is a 3-7 day wait for the part to be sent to us as Home Depot does not carry one in stock in the greater Atlanta area apparently. We will be returning this unit and purchasing another unit from a different store as Home Depot only carries Rheem products. This entire experience does not represent any issues with Home Depot as they only sold us the unit: this is all the manufacturer. December 30, 2013
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