Rheem RTEX-13 240-Volt 1-Chamber 13kW Electric Tankless Water Heater
Rheem RTEX-13 240-Volt 1-Chamber 13kW Electric Tankless Water Heater
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Rheem

Rheem RTEX-13 240-Volt 1-Chamber 13kW Electric Tankless Water Heater

|9 ratings

Key item features

  • Broad Applicability: This Rheem RTEX-13 electric tankless water heater is suitable for whole-house commercial and residential applications.
  • Electrical Power: Operates at 208/240VAC, drawing 54 amps for 13,000 watts, ensuring endless hot water with 0.30 GPM minimum flow activation.
  • Precise Temperature: Features an adjustable digital display for exact temperature settings from 59 to 140 degrees F, with a 120-degree F default.
  • Compact Dimensions: Its slim profile measures 12-5/8 inches height, 8-1/4 inches width, and 3-5/8 inches depth for space-efficient installation.
  • Water Flow: Provides a 59°F temperature rise at 1.5 GPM and 36°F at 2.5 GPM, supporting a maximum flow rate of 4 GPM.
  • Durable Construction: Equipped with 1/2 inch NPT water connection, it handles 25 to 150 psi pressure and features lead-free replaceable heating elements.
  • Certified Standards: Adheres to UL 499 and CSA safety standards, ensuring reliable, compliant operation.
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Specs

Water heater type, Tankless Water HeatersFuel type, ElectricBrand, RheemVolume capacity, 13 Gal.</li><li>Temp.Features, AdjustableRec location, Indoor

About this item

Product details

Electric Tankless Water Heater, Whole House, Water Heater Application General Purpose, Commercial/Residential, Watts - Water Heaters 13,000, Amps - Water Heaters 54, Voltage - Water Heaters 208/240, Min. Flow Activation 0.30 gpm, Phase - Water Heaters 1, Temp. Range - Water Heaters 59 Degrees to 140 Degrees F, Water Connection 1/2 In. NPT, Temp. Rise @ 1.5 GPM 59 Degrees F, Temp. Rise @ 6.0 GPM Limited to Thermostatic Setting, Temp. Rise @ 2.5 GPM - Water Heaters 36 Degrees F


Features

  • Amps AC: 54
  • Depth: 3-5/8"
  • Features: Endless Hot Water, Replaceable Heating Element, Adjustable Digital Temperature Display
  • Height: 12-5/8"
  • Item: Electric Tankless Water Heater
  • Phase: 1
  • Temp. Range: 59 Degrees to 140 Degrees F
  • Width: 8-1/4"
  • Wire Size: 6 AWG
  • Mounting: Wall
  • Pressure Range: 25 to 150 psi
  • Voltage: 208/240VAC
  • Watts: 13000
  • Standards: UL 499, CSA
  • Water Connection: 1/2" NPT
  • Max. Flow Rate: 4 gpm
  • Temp. Rise @ 1.5 GPM: 59 Degrees F
  • Temp. Rise @ 2.5 GPM: 36 Degrees F
  • Min. Flow Activation: 0.30 gpm
  • Temp. Rise @ 6.0 GPM: Limited to Thermostatic Setting
  • Water Heater Application: General Purpose
  • Residential / Commercial: Commercial/Residential
  • Elements: Lead-Free Replaceable Cartridge Insert
  • Default Temperature: 120 Degrees F
  • Water Heater Design: Whole House

  • Item Type: Electric Tankless Water Heater
  • Brand: RHEEM
  • Manufacturer Part Number: RTEX-13
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Specifications

Water heater type

Tankless Water Heaters

Fuel type

Electric

Brand

Rheem

Volume capacity

13 Gal.
  • Temp.

    • Warranty

    Warranty information

    FAO warrants purchases against manufacturing defect for 30 days from the date of purchase (see "Return Policy"). FAO makes no warranties, express or implied, beyond this period, unless otherwise specifically and expressly stated. Further warranty may be offered by the product manufacturer. This warranty does not apply to products which are used for purposes other than that which they were designed for or which have been altered in any way that is detrimental to the performance or life of the product. For warranty information on a particular item or to obtain warranty parts/service on an item (if applicable), please contact the item manufacturer.

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    Warnings

    Customer ratings & reviews

    3.4 out of 5 stars
    stars
    9 ratings8 reviews
    Includes global ratings and reviews
    How item rating is calculated
    1. 5 stars56% (5)
    2. 4 stars0% (0)
    3. 3 stars0% (0)
    4. 2 stars22% (2)
    5. 1 star22% (2)
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    Showing 1-3 of 8 reviews

    Apr 5, 2026
    Reviewer name: Randall
    Sold and shipped byMWH
    5 out of 5 stars
    5 out of 5 stars review

    Verified Purchase

    The hot water is dial able and that is good. Fir under the sink it is great

    Helpful?7KV327LICGLF452128463
    Feb 2, 2021
    Reviewer name: debbie
    5 out of 5 stars
    5 out of 5 stars review

    Verified Purchase

    great space saver, works great

    Helpful?7KV327LICGLF452128463
    Feb 4, 2020
    Reviewer name: nonya
    5 out of 5 stars
    5 out of 5 stars review

    powerful for its size

    I installed this unit in my 2/1 1960's condo replacing a 30gal water heater. What a great product! The install was easy i had to upgrade my breaker to a 60 from a 30 which meant upgrading the wiring gauge, which wasn't hard at all. I have hot water on demand now that never runs out! my 30 gal tank would only provide about a 5 min shower now its as long as i want. I have to fill my tub with free flow hot water at only half flow but to keep hot water but i figured as much from such a small unit. overall it was very much worth it to ditch the hot water storage tank and have hot water on demand for as along as in need it. If i were to try to heat a larger house with 2 or 3 baths I would suggest a larger unit but the product is GREAT!!

    Review from rheem.com
    Helpful?7KV327LICGLF452128463
    reply from Supplier Response

    Hi, Thank you for tanking time to write this review, we appreciate the great feedback and we happy to hear installation was easy and you are enjoying or new water heater. Jennifer

    Current price is $265.00
    Price when purchased online
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    Sold and shipped by MWH
    4 out of 5 stars
    4 stars out of 5, based on 5 seller reviews(4.0)
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