Model # RETE 18

Internet #202514585

Store SKU #452888

Rheem RETE-18 - 18kW 2.73 GPM Tankless Electric Water Heater
0020352592015

Rheem

RETE-18 - 18kW 2.73 GPM Tankless Electric Water Heater

  • 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.
$498.00 /each

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Product Overview

The Rheem RETE-18 tankless Electric Water Heater features a rugged brass and copper heater exchanger that is designed to withstand tough water conditions for long life. Its lightweight and compact design enables simple installation in a variety of locations. It is designed to provide hot water for up to two bathrooms in warmer climates or a single bathroom in colder climates. Please click the "More Info" Tab and then "Specifications" to view the Rheem Brochure Guide to assist you in your purchasing decision.

California residents: see   Proposition 65 information

  • Provides a maximum of 3.51 GPM continuous flow at a 35 Degree F temperature rise
  • Designed to provide hot water for up to two bathrooms in warmer climates or a single bathroom 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
  • 18kW water heater requires a 240-Volt electrical service, 2 separate 40 Amp breaker(s) 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
  • 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.



  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Name 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater RETE-18 - 18kW 2.73 GPM Tankless Electric Water Heater 27 kW Self-Modulating 5.3 GPM Electric Tankless Water Heater 18 kW 2.74 GPM Smart Pool Electric Pool Water Heater
Brand EcoSmart Rheem EcoSmart EcoSmart
Ratings (128) (76) (160) (3)
Flow Rate @ 45 F Rise (gallons/min) 2.73 2.5 4.10 2.73
Wattage (watts) 18000 18000 27000 1800
Indoor/Outdoor Indoor Indoor Indoor Indoor
Water Heater Features Wall Mountable No Additional Features Wall Mountable Wall Mountable
Certifications and Listings 1-UL Listed,CSA Listed,ETL Listed 2-UL Recognized 1-UL Listed,CSA Listed,ETL Listed 1-UL Listed,CSA Listed,ETL Listed
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Customer Questions & Answers

will it work with propane?

Asked by: monte
No, this will not work with propane.
Answered by: Rheem
Date published: 2015-11-10

18KW=40Amp x 240V ? How come??

Asked by: CRAZYME
I am a bit unclear of your question. This unit runs three 5500w elements simultaneously using 240 volts to achieve the GPM (gallons per minute) rating. If you have questions or need further clarification please contact our technical support team at 800-431-1549 – 7 to 7central time, 7 days a week, this includes weekends and holidays.
Answered by: Rheem
Date published: 2016-10-24

What is the minimum electric service requirement for this unit? How many breakers/amperage needed?

Asked by: Lvtgolf
Amperage is calculated by dividing wattage by voltage So 18,000W / 240V = 75amps Steve
Answered by: Steve
Date published: 2016-07-13

Is this the proper size for me?

RE: RETE-18 - 18KW Electric tankless water heater. I want to go with a tankless water heater, but am unsure as to what flow rate I should look for. I live alone, so there wouldn't be an issue with a lot of hot water demand at one time, i.e., shower + dishwasher + washer would not be running at the same time. I have low flow faucets and shower heads.
Asked by: Teacher
Usually 2.5 gallons per minute CONTINUOUS Heated Water. Enough for the hole house.
Answered by: MZ70
Date published: 2016-07-13
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Customer Reviews

RETE-18 - 18kW 2.73 GPM Tankless Electric Water Heater is rated 3.2 out of 5 by 76.
Rated 1 out of 5 by from Cannot be repaired This worked ok for almost 2 years. Quit working and has a bad magnetic flow switcch. Searched for hours And Rheem cannot even tell me where to purchase switch. Rheem does not recognize RETE-18 as a model number
Date published: 2016-10-04
Rated 1 out of 5 by from FLOODED MY HOUSE UNIT BROKE ON. With two 40 amp 220 volt circuits it goes bad real fast... in seconds. In my case the water heater boiled the water and with valves closed it forced pressurized boiling water (250 degrees Fahrenheit) and steam backwards down the main water line. Where the copper pipe meets the white PVC the 3/4 threaded connection blew apart leaving the water main, a 3/4 line, wide open to flood the house. The internal circuit-breakers in the water heater finally switched the unit off. DON'T CALL HD or RHEEM it's a waste of time. Order and new unit online and have it shipped to your house. Swap it out and return the blown unit to HD for full credit.
Date published: 2017-03-23
Rated 1 out of 5 by from Poor Quality - works for 2 years tops!!! The first one I bought was DOA (red flag) and got this replacement ordered on 6/19/12 at Home Depot in Hurricane, WV. It was installed around August 2012 and it died right after Thanksgiving 2014. So about two years or less is all your going to get out of one of these. I haven't seen where anyone has had one longer than that. So I guess I was lucky. It was in a detached two story garage with a full bath and I bet it didn't have 1000 gallons through it. The board on these are extremely fragile. Remember only 1 year warranty. Should have done my homework before I bought this unit or paid attention to the red flag. Guess I will go back to tank heater. Even the other brands have similar problems.
Date published: 2015-02-05
Rated 1 out of 5 by from Worst product and company ever. change it 3 times and did not last more then YEAR 1/2. then compa... Worst product and company ever. change it 3 times and did not last more then YEAR 1/2. then company wants you to call a service man to come fix it cause they don't cover it. only 1 year warranty. other had broken before the year that's why i had it replace which took an E &P to replace each time. don't wast your money on this product. you will end up spending more and have more frustrations then what you save. costumer service people are rude and not much help at all.
Date published: 2017-03-16
Rated 1 out of 5 by from Think again before buying this product Three weeks without hot water & Rheem refuses to stand by its product! I've purchased a digital voltage meter & a $50 adapter to reduce water flow to a trickle & the water is lukewarm if it's warm at all! Rheem contends that since the voltage inside the heater is working it's our problem that we don't have hot water! Home Depot needs an RA number from Rheem to return it & Rheem is not willing to give one! Once these heaters are installed they are difficult to return
Date published: 2016-11-15
Rated 2 out of 5 by from First one lasted for less than a year. Replaced under warranty and now about 3 years on the repl... First one lasted for less than a year. Replaced under warranty and now about 3 years on the replacement it died last night. Just like someone else mentioned it started heating the water to scalding point and then the next time I turned the water on it wouldn't get more than lukewarm.
Date published: 2016-11-14
Rated 5 out of 5 by from Love those long showers! We have a split water system, so when we're so happy with our first tank less waterheater, we decided on a second larger unit for a bath and kitchen. So glad we did. We have a total electric home, so an electric unit was our only choice, but it has been a good one.
Date published: 2017-02-28
Rated 1 out of 5 by from Junk I have went through 4 of them. Longest one lasted 1.5 years then 1 month then 10 mins now we'll see how long this one lasts
Date published: 2016-12-30
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