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Rheem EcoSense

Model # RETE 9

Internet # 202514581

Store SKU # 452604

RETE-9 - 9kW 1.37 GPM Point of Use Tankless Electric Water Heater

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

$175.99 /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 9

Internet # 202514581

Store SKU # 452604

Store SO SKU # 1000114404

The Rheem EcoSense RETE-9 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 1 standard low-flow lavatory sink. 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 2.2 GPM continuous flow at a 35°F temperature rise
  • Designed to provide continuous hot water at a single point-of-use faucet
  • 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
  • 9kW water heater requires a 240-Volt electrical service, a dedicated 40 Amp breaker and 8-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 1/2 in. water connections for easy installation
  • Max flow rate 3.0 GPM
  • 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 4.0 out of 5 by 42 reviewers.
Rated 4.0 out of 5.0 by Very useable hot water system for small home. The first unit fail in a week, after I contacted Rheem tech support and being transfered around a couple of times I finally spoke with a very helpful person who had me remove to cover and check a reset button then ask if I had a multimeter and had me test the input voltage and heater resistances which were ok. He then determined the controller had failed and issued a return authorization. After returning the unit to my local Home Depot for credit we reordered on line, and the new unit arrived and worked fine. It provides adequate warm water for light use such as sinks and a low flow shower, but must be set to max output for "hot" water. The unit takes up very little space uses little power and works well at our lake cabin. Installation requires copper pipe at the heater and SharkBite fittings work best. June 9, 2015
Rated 5.0 out of 5.0 by Exactly what I hoped it would be I read some reviews on this product before I bought it and some of those people should be embarrassed of themselves. There is a clear chart showing how to "size" the tankless style water heater for your area. Some of these people are getting this small unit when their ground water is only 50 degrees, what are you seriously expecting to happen. This unit works great for my house. I have a 2 bedroom 2.5 Bath Townhouse in South Florida. I don't need a very strong tankless heater because our ground water is so much warmer than the rest of the country. So this thing works great. If you properly size the unit for you house and location it will work just fine. September 16, 2014
Rated 1.0 out of 5.0 by Fail I chose to purchase this because it was made by Rheem. The heater worked ok heating the water to an appropriate temp. After 2 months I had to reset its internal breaker. Two days later again ... and so on. I have now ordered another brand and will not buy another Rheem product. I am not there repair technician nor there Q/A person, If they can not produce quality products I will return there junk and find a company who can. October 21, 2015
Rated 5.0 out of 5.0 by I love my Rheem RETE-9 ! My son installed this tankless water heater under my bathroom sink about 5 years ago, and it has functioned flawlessly during that time. It gives me plenty of good-and-hot water, delivered very quickly. If I want it scalding hot, I just run the stream a bit slower. A few months after installing it, I asked my son to connect it to the shower that backs up to the same wall. The flow there is a bit slow for my taste, and I have to run the shower full hot in order to get a good water temperature for that higher-volume flow; I'm fairly satisfied with that, but I would recommend a more powerful heater if you want to use it for a shower. December 3, 2014
Rated 5.0 out of 5.0 by Lovin it! We have a small one bath, two sink cottage which had a huge water heater in my closet taking up space. My brother and friend (who are handy) installed this tankless system. It takes a new heavier wire to the electric box and some new pipe ends. I would hire it done unless you have done a lot of this work before. Installed this tankless is awesome! I have continuos hot water for my shower that stays constant. It is super hot for dish washing. Probably could not wash dishes and someone take a shower at same time on this small system. But it cleared up my closet space and I don't have to pay for heated water sitting around. I love it! April 28, 2013
Rated 3.0 out of 5.0 by Not so great. The water at best gets luke warm in the shower with a 3 sec burst of burn you butt, I have a very small house and thought this would work good for us, but I still have to boil water for my dishes.Although you save on the power bill is the only positive I have found but then again. I only have warm not hot water November 23, 2015
Rated 4.0 out of 5.0 by quick heat Heater delivered to my home, and after 3 trips to the store for fittings, not too bad to install and splice into the existing lines. Left the 220v and new breaker install to a pro (another $200). Turned a 10 minute wait into a 5 second delay for hot water at the kitchen sink, and a happy spouse. March 3, 2015
Rated 5.0 out of 5.0 by Great product I installed this unit to provide hot water in my workshop sink. I was tired of washing my hands in 40 degree water. I am glad I got the 240V unit as I do not think the 120V unit would have been able to meet the challenge. I did not have any trouble installing it, but I know how to run water lines. If you have experience running water lines, you should not have any trouble. If not, you may be in for a challenge. I also already had a dedicated 240V outlet I could use. If you had to run the power yourself, it would have been more challenging. January 31, 2012
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