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Rheem EcoSense

Model # RETE 13

Internet # 202514583

Store SKU # 452637

RETE-13 - 13KW 1.97 GPM Tankless Electric Water Heater

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

$178.74 /each
  • Uses energy only when hot water is needed
  • Compact design allows simple installation almost anywhere
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.




Model # RETE 13

Internet # 202514583

Store SKU # 452637

Store SO SKU # 1000114405

The Rheem EcoSense RETE-13 Tankless Electric Water heater features a rugged brass and copper heat exchanger that is designed to withstand tough water conditions for long life. Its lightweight and compact design saves space and enables simple installation in a variety of locations. It is designed to provide hot water for a single bathroom in warmer climates or continuous hot water at a single point-of-use faucet in colder climates. Please click the "More Info" Tab and the "Specifications" to view the Rheem Brochure Guide to assist you in your purchasing decision.

  • Provides a maximum of 2.54 GPM continuous flow at a 35 degree Fahrenheit temperature rise
  • Designed to provide continuous hot water for a single bathroom in warmer climates or continuous hot water at a single point-of-use faucet in colder climates
  • Flow rate provided by a tankless electric water heater is dependent on the difference in temperature of the incoming cold water supply and the desired hot water delivery temperature
  • 13 kw water heater requires a 240 volt electrical service, a dedicated 60 amp breaker and 6 gauge copper wiring
  • Energy efficient, uses hot water only when needed
  • On-unit temperature controls and LED lights indicate active elements and system operation
  • Modulating control adjusts power consumption to meet the required hot water temperature and flow rate
  • Rugged brass and copper heat exchanger is designed to withstand tough water conditions for long life
  • Lightweight and compact design saves space and enables simple installation in a variety of locations
  • Requires 240 Volt Electrical connection
  • Equipped with ½ in. water connections for easy installation
  • 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.) 
7.25 in 
Water Connection Size (in.) 
Amperage (amps) 
Electric Product Type 
Point of Use 
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 
Maximum Temperature (F) 
Minimum Activation Rate (gpm) 
Minimum Temperature (F) 
Product Weight (lb.) 
8 lb 
Residential/Commercial/industrial Use 
Residential or commercial 
Water Connection Location 
Water Heater Features 
No Additional Features 
Wattage (watts) 
Warranty / Certifications
Certifications and Listings 
2-UL Recognized 
ENERGY STAR Certified 
Labor Warranty 
No Warranty 
Part Warranty 
1 Year 


Rated 4.2 out of 5 by 266 reviewers.
Rated 5.0 out of 5.0 by Why are traditional tank water heaters still being made? I bought this to replace an old 40gal gas water heater. The thought process behind a tankless heater just makes so much more sense to me. This 13kw Rheem was so affordable I thought it was at least worth a try for my 3 bathroom ranch house in east Tennessee. If it turns out to not be able to keep up, I'll just add another 13kw unit either in tandem or at the opposite end of the house. So far this single one is working great though. Everyone who looks at it can't believe it actually works due to how tiny it is. Installation was very easy. I do wish it had standard water heater 3/4" threaded fittings, rather than the 1/2" compression fittings. My house is plumbed with PEX so I had to be sure to have at least 3 feet of metal piping going in and out of the heater per the manufacturer's instructions. I also installed servicing valves on the cold and hot sides for future flushing needs. The valves should also make future servicing/replacement a breeze with the ability to isolate the water supply. I also installed a non-fused 60amp disconnect next to the unit for added safety. This wasn't necessary given that the double 60amp breaker is within sight, I just did it as an added precaution. I tried to make an extended pigtail out of 6/2 wire (the pigtail it comes installed with is 8/2 wire) but the 6/2 was too big for me to get clamped down. I ended up with 8/2 from the heater to the disconnect and 6/2 from there to the breaker box. It is working fine. Since I had the old 40gal unit that I was just going to scrap, I decided to gut it and plumb it in as a 40gal reservoir for the tankless unit to pull from. This set up is in my basement and I figured having the 40gal of basement temperature water to pull from would make for more predictable hot water temperatures than drawing from the supply at the street. Given that you can't set an output temperature on this unit (only a dial from low to high), I thought any variance in incoming water temperature that I could minimize would help make it a "set it and forget it" installation. Anyway, I've been using this for about 3 weeks now and would definitely recommend it so far. I'll update this review if I every run into any problems. February 25, 2015
Rated 4.0 out of 5.0 by Super happy Replaced my traditional tank water heater and saves us money on our electric bill. The water gets as hot as you need and gets hot FAST. My only complaint is the water temperature will occasionally fluctuate (losing heat) while taking a shower, but it's only a minor irritation. August 28, 2014
Rated 5.0 out of 5.0 by Install in-Line for optimal performance I installed this unit in-line, so that I can use the tankless hot water heater or the existing gas heated water tank. I turn on the tankless heater, when only one or two persons are in the house or in the summer. I turn off the tankless and turn on the gas water tank when visitors are expected. The installation took about 20 minutes and only required a wrench, a screw driver and one additional copper pipe connector, Please see my photo of the installation to see how this works. October 30, 2014
Rated 5.0 out of 5.0 by Excellent Product. I have TWO of these installed so that I can get twice as much Instant Hot Water for my whole house anytime I want. The original manufacturer of this Design won a contest NASA Held for the Space Shuttle Program Water Heaters. The Company was in Florida and still exists today. I've had mine for 10 years, then had to replace one when the unit was clogged and I didn't catch it in time. I originally setup two so I'd have a backup if the other went down, (which will work fine if you do the piping properly). But since these are 1/2" inch input, you won't get tons of Hot water like you do when two of them are working! A Great Product! Easy to install, even easier to replace (If you ever need to!). May 13, 2014
Rated 4.0 out of 5.0 by great price for this product,lots of usable space after installation The unit is small but powerful .After my wife and I installed the unit we had tons of space under are kitchen cabinet for extra pots and pans.This unit provides plenty of continuous hot water to kitchen sink witch is 2 feet away and bathroom fixtures witch are 20 feet away! It currently can raise the ground water temperature from 57.7 degrees ferenheight to 150 degrees ferenheight, The temperature adjustment knob is perfectly placed and clearly marked for user friendly changes. It may be wise to install anti scalding device if you have children and or elderly in the house hold. I did"nt do the math but I"am sure this unit will save me 10 to 20 dollars a month in electricity. November 22, 2013
Rated 5.0 out of 5.0 by Excellent Value Not just a point of use water heater. I use this as my whole house water heater. For 1 or 2 person households in the south, it is an extremely inexpensive and space saving alternative to a conventional tank model water heater.You don't really want to take a shower while something else is using hot water, but I always felt that was true for a tank heater as well. I had to have my electric panel upgraded, which I paid a pro to do, but actually installing the heater isn't that difficult for an experienced do-it-yourselfer comfortable with plumbing and wiring. The best feature of the tankless heaters, in my opinion, is that the supply of hot water is unlimited. You need a long hot shower for a stiff back? No Problem. Two people need to take showers one right after the other? No Problem. Do a load of wash with hot water right after? No Problem. You never have to wait for that whole tank to heat again or finish a shower with cold water. Saves money with the electric bill, too. January 14, 2014
Rated 4.0 out of 5.0 by Simple set up! Plumbing this tankless heater was quite simple. Wiring it was more difficult. I needed to replace my double 30 amp. breaker with a double 60 amp. Use 6 gauge wire from the breaker to the 8 gauge wire coming out of the heater. A wiring diagram would have been very helpful. I have 38 degree water coming in from a well and it heats it to 105 degrees fast. February 1, 2014
Rated 5.0 out of 5.0 by So far, so good. I purchased the water heater for a small camp in Louisiana. It provides hot water for the kitchen sink, bathroom sink and small shower. I placed a small water filter inline with the cold water intake because we are using well water. Amazing that such a small unit does all of that. I know nothing about plumbing and I managed to hook it up without major problems. The only thing that scared me about the hook up was the copper compression fittings that are required to run in and out of the unit. I had a small leak at first, but after I put the wrench to it all was fine. I would recommend this product. September 17, 2013
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