#1 Home Improvement Retailer

Performance 24 kw Self-Modulating 4.68 GPM Tankless Electric Water Heater

$588.78
Apply Now
Pay $538.78 after $50 OFF your total qualifying purchase upon opening a new card. info
Apply for a Home Depot Consumer Card
  • Electric tankless water heater provides consistent hot water
  • Energy/cost savings up to 34% in whole-home installations
  • Tankless water heater requires 3 x 40 AMP double pole breakers
  • View More Details
icon
Free & Easy Returns In Store or Online
Return this item within 90 days of purchase. Read Return Policy
Product Details

About This Product

This Rheem Performance Electric Tankless Water Heater gives you continuous hot water on demand. It's perfect for small spaces and doesn't require venting. This whole-home system provides hot water for up to three showers and two faucets and it's easy to adjust the temperature. This energy-saving tankless water heater is backed by a one-year parts limited warranty and a five-year heat exchanger warranty.

Highlights

  • Energy and cost savings: heats water only when it is needed for savings of up to 50% on water heating costs when used in a point-of-use application, or 34% when used as a whole-home solution
  • Instant, continuous hot water: provides ample hot water for up to three showers and two faucets (review selection guide below to confirm this water heater will provide the hot water needed based on your geographic location)
  • Space savings: small, compact design fits perfectly in tight places like under cabinets and sinks
  • Great investment and value: energy cost savings and a five-year heat exchanger and one-year parts limited warranty
  • Easy to adjust: electronic temperature control adjustable in 1-degree increments from 80-140 degrees F with easy-to-read display (Celsius and Fahrenheit compatible)
  • Easy installation: compatible with 3/4 in. water connectors for flex hose installation and no venting or T and P valve required (professional installation recommended)
  • Easy to maintain: durable, easy-to-replace heating elements
  • A reliable hot water solution from Rheem, the global leader in water heating
  • Before purchase and installation, please verify that you have the proper electrical requirements for your chosen heater
  • ETL Listed to UL-499 and CAN/CSA-C22.2 No. 64
  • Check out our buying guide on water heaters
  • What tankless water heater is right for you?
  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 300800689

Model # RETEX-24

Specifications

Dimensions: H 18 in, W 17.625 in, D 3.5 in

Dimensions

Product Depth (in.)

3.5 in

Product Height (in.)

18 in

Product Width (in.)

17.625 in

Water Connection Size (in.)

3/4 in NPT

Details

Amperage (A)

100 A

Application Type

Residential

Electricity Phase

Single Phase

Finish Family

Gray

First Hour of Delivery (gallons/hr)

281

Flow Rate @ 35°F Rise (gallons/min)

4.68 gal (US)/min

Flow Rate @ 45° Rise (gallons/min)

3.64 gal (US)/min

Flow Rate @ 55° Rise (gallons/min)

2.98 gal (US)/min

Flow Rate @ 65° Rise (gallons/min)

2.52 gal (US)/min

Fuel Type

Electric

Heat Exchanger Warranty

5 Year

Indoor/Outdoor

Indoor

Maximum Temperature (F)

140 F

Minimum Activation Rate (gpm)

0.25

Minimum Temperature (F)

80 F

Number of Elements

3

Number of Showers

1-2

Pack Size

1

Product Weight (lb.)

14 lb

Required Volt Connection

240 volt

Returnable

90-Day

Uniform Energy Factor

0

Water Heater Features

Wall Mounted

Wattage (watts)

24000 W

Warranty / Certifications

Certifications and Listings

CSA Listed, ETL Listed, UL Listed

Labor Warranty

No Warranty

Part Warranty

1 Year

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

4 out of 5

  • 4 out of 2,338 reviews
  • 62% recommend this product
Filter by:
Showing 1-10 of 2,338 reviews
Lifecycle 2 years
Rheem claims to have the best warranty, it is only 1 yr for parts. In year 2 the first heating element will disintegrate and clog all my hot water lines with metal particles. Include the water lines to my Thermodor dishwasher and high end LG washing machine. Be prepared to replace this unit every 2 years and pay to have all your lines flushed and risk voiding your appliance warranties This item should be recalled
by
    Beware.
    Voids all warranty if. Water quality is >11 Gpg (hardness scale) Your water has chlorine. You don't flush your unit every 3 months. There's any "build up" anywhere on the unit. Many many many more reasons to avoid honoring their warranty. Your welcome I hope online shoppers see this review.
    by
      • Recommended
      Did not heat the water to set temperature. Not impressed. Looking for other options. Box was damaged on arrival.
      by
      Response from RheemApr 18, 2024
      Gene,

      We are sorry to hear about the issues you’re experiencing with your water heater. It’s definitely frustrating when a product doesn’t meet your expectations, especially when it arrives in a damaged box.

      If you haven’t done so already, we would recommend contacting The Home Depot’s customer service about the damaged packaging and the performance of the water heater. They may be able to provide a replacement or refund or offer a solution to the heating issue.

      In the meantime, if you’re looking for other options, there are many different types and brands of water heaters available on the market. Factors to consider when choosing a new water heater include the size of your household, your hot water usage, energy efficiency, and your budget. A professional plumber or a representative at a home improvement store can help guide you to the best option for your needs.

      We hope this helps, and we hope your issue gets resolved soon! For assistance please call, 800-374-8806 between the hours of 8 A.M. and 5 P.M. EST Monday through Friday.

      Derius rheem
      • Verified Purchase
      1 found this review helpful
      This water heater lasted 1 year and 2 weeks!
      Our first electric tankless was an ECO-18 and it lasted 3 years. I bought this one from Home Depot on 3/28/3024 and installed the same day. It worked great for 1 year. It has a 1 year warranty on parts. It was 2 weeks out of warranty when it died yesterday.
      by
      Response from RheemApr 16, 2024
      Hello James,

      We are sorry to hear about the issue with your water heater. It’s unfortunate that it stopped working just after the warranty period.

      You might want to contact the technical support team to see if they can provide any assistance. Our Technical Support team may be willing to help even if the warranty has just expired.

      In the future, you may want to consider purchasing an extended warranty for such appliances.

      Also, regular maintenance and proper use can extend the life of such appliances. Make sure to follow the use and care instructions for proper use and maintenance.

      We hope this helps and you get your water heater issue resolved soon.

      For additional assistance, please call 800-374-8806 between the hours of 8 A.M. and 5 P.M. EST Monday through Friday.

      Derius rheem
        • Recommended
        2 found this review helpful
        The first product I received was refurbish. And that was mailed to my home the second time. I got it. I had it shipped straight to home depot and it was a brand new one, home depot online helped with it. And gave me a refund. The sandusky home depot was very unhelpful, So the reason for the bad rating and customer service is due to home depot in sandusky
        by
        Response from RheemApr 4, 2024
        Richard,

        We are sorry to hear about the issues you faced with the delivery and customer service at your local Home Depot in Sandusky. It’s unfortunate that the first Performance 27 kw Self-Modulating 5.27 GPM Tankless Electric Water Heater you received was refurbished. However, we are glad to hear that Home Depot online was able to assist you and provide a refund. Your feedback is important and can help improve the overall service.

        Derius rheem
        • Verified Purchase
        E5 code error
        I was soo happy on getting this install, ran my wires, panel update, all good, love the feeling of having this mount taking no space, too good to be true, but seem that my small house isn’t small enough for it I have to keep for now the hot water line half open to avoid trigger the E5 code error ( too much water flow) been that the tank is literally no even 8’ from shower to trigger that, now I have to figure how to fix this, I have 3 faucets, 1 shower and wash machine and is water well system
        by
        Response from RheemApr 4, 2024
        Hi,

        Thank you for your feedback. We are sorry to hear about the issues you’re experiencing with your water heater. It’s unfortunate that you’re having to deal with the E5 code error due to too much water flow. We understand how frustrating this can be, especially when you’ve put in the effort to install the unit and update your panel. If you have any questions or need assistance with anything, feel free to call 800-374-8806 between the hours of 8 A.M. and 5 P.M. EST Monday through Friday.

        Derius rheem
          Rheem performance 36kw insta hot
          I purchased this whole house insta hot system to replace my old hot water heater. Had a professional electrician install it. It takes four 40 amp breakers to power it. My first unit would not power on. Entire weekend with no hot water. Purchased the same unit and it works. But, the hot water pressure is very poor. The water is hot but not much flow. Had plenty of flow with the 21 year old hot water tank but the new Rheem insta hot not so much. Did I tell you I purchased the largest insta hot Rheem makes! I should have got a new hot water tank. Buyer beware.
          by
          Response from RheemMar 22, 2024
          Jimmie,

          We are sorry to hear about the issues you’re experiencing with your water heater. It’s indeed frustrating when a new product doesn’t meet our expectations.

          Low water pressure can be due to several reasons. It could be related to the plumbing in your house, or it could be an issue with the unit itself. A few things you might want to check are for any blockages in your plumbing, the flow rate settings on your unit itself, review the installation itself, and you can always contact the Technical Support team for additional assistance. Please contact, 800-374-8806 between the hours of 8 A.M. and 5 P.M. EST Monday through Friday.

          We hope this helps, and your issue gets resolved soon!

          Derius rheem
            Buyer beware
            We purchased and installed one of these about two and a half years ago. Had no issue until this week. One of the heating elements disintegrated. Once the heating element broke apart, the small pieces and parts ran through all of the hot water system. Thankfully the filters for the washing machine and dishwasher prevented the debris from destroying the inlet valves. But the pieces and parts did destroy two faucets. Damage costed a couple thousand. I do not recommend this product at all.
            by
            Response from RheemApr 2, 2024
            Hi,

            We are really sorry to hear about your experience with the water heater you have reviewed. It’s unfortunate that the heating element disintegrated and caused damage to your faucets. Your feedback is valuable and it’s important to help us be aware of these potential issues. If you haven’t already, we would recommend reaching out to our Technical Support team at 800-374-8806 between the hours of 8 A.m. and 5 P.M. EST Monday through Friday for possible solutions or compensation for the damage caused. If you need any assistance with this process or have any other questions, feel free to ask our experienced technicians.

            Derius rheem
              4 found this review helpful
              Defective
              We bought this and had it installed by our contractor. When it came time to test it out, it would not work at all. Our contractor did the runaround with customer service to figure out what the problem was and they determined that the unit was just defective when we received it. Waste of time.
              by
              Response from RheemApr 2, 2024
              Taylor,

              Thank you for this review. We are sorry to hear about your experience. It’s unfortunate that the unit you received was defective. The water heater you have reviewed is generally known for its energy efficiency and consistent hot water supply. It’s designed with self-modulating technology that adjusts energy based on your hot water needs. However, like any product, there can be instances where a unit may have issues.

              We would recommend reaching out to the Home Depot or our Technical Support team for a replacement or refund, especially if the product recently purchased. They should be able to assist you with the next steps. We hope your issue gets resolved soon. Please contact 800-374-8806 between the hours of 8 A.M. and 5 P.M. EST.

              Derius rheem
                1 found this review helpful
                DO NOT BUY - BOUGHT MARCH 2023 DIED IN 11 MONTHS
                Bought March 2023 - Rheem will give you the run around if you call them for the warranty. Have you test the unit, open it up. Test the voltage and do all kinds of things. When it still does not work they will say that a supervisor has to call you in 24 hours to see if they can exchange or repair the unit. In additions they say you have to service the unit every 3 months?!?!? Garbage. Never again will I buy a Rheem product.
                by
                Response from RheemApr 2, 2024
                Hi,

                We are sorry to hear about your frustrating experience with the water heater you have reviewed. It’s essential to have reliable appliances, especially when it comes to something as crucial as hot water.

                A reliable water heater should perform consistently and efficiently.
                Remember that individual experiences can vary, but it’s essential to consider both installation and usage needs when making purchasing decisions. If you need further assistance, or have additional questions, please contact 800-374-8806 between the hours of 8 A.M. and 5 P.M. EST Monday through Friday.

                Derius rheem
                  3 found this review helpful
                  Showing 1-10 of 2,338 reviews

                  Compare Similar Items

                  current item

                  Required Volt Connection

                  240 volt

                  240 volt

                  240 volt

                  240 volt

                  Wattage (watts)

                  24000 W

                  36000 W

                  27000 W

                  19200 W

                  Application Type

                  Residential

                  Residential

                  Residential

                  Residential

                  Indoor/Outdoor

                  Indoor

                  Indoor

                  Indoor

                  Indoor

                  Water Heater Features

                  Wall Mounted

                  Wall Mounted

                  Wall Mounted

                  Digital Display, Freeze Protection, Overheat Protection, Wall Mounted