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Rheem 3.5kW Point-of-Use Thermostatic Tankless Electric Water Heater - 120V

  • Based on 54 reviews
Condition: New
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Availability: Only 5 left in stock, order soon!
Fulfilled by MTL Retailers

Arrives Friday, Oct 23
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Style: Point-of-Use, 3.5 kw


Features

  • Get the performance you expect. Choose the right size water heater for your home and verify electrical requirements before installation. When properly sized and professionally installed, Rheem Tankless Electric Water Heaters deliver reliable, on-demand hot water while saving valuable space.
  • 3.5 kW model provides up to 0.5 GPM
  • Point-of-Use Water Heaters are ideal for small spaces and one fixture applications - Basement sink, garage workshop, outdoor kitchen.
  • Wiring Requirements (RTEX04T): Requires 120V singlephase power, one- 30amp singlepole breaker, one set of #10 AWG copper conductors with ground, and a recommended minimum 100 amp household electrical service panel for proper operation.
  • Digital thermostatic temperature controls in 1-degree increments ranging from 80F - 140F (26C - 60C).
  • Saves Energy - Tankless electric water heaters only heat water when a hot water tap is turned on. By heating water only when needed elimantes energy used to maintain desired water temperature in standard tank water heaters.
  • Save Space Without Sacrificing Hot Water - Compact design that frees up valuable floor space, 90% smaller than traditional tank water heaters.
  • No Venting required to operate, simplifying the installation process compared to a tankless gas water heater.
  • Warranty: 5-Year Leak, 1-Year Parts

Description

Rheem Professional 3.5kW thermostatic tankless electric water heater for residential and light commercial applications. Save water by eliminating the wait for hot water to reach the faucet. Install the heater directly at the point-of-use. Ideal for single, low-flow rate applications such as bathroom, wet bar, or garage sinks. See performance guide for average expectations in your region based onground water temperature and application flow rate.

Brand: Rheem


Capacity: 0.9 gallons


Power Source: ac_dc


Product Dimensions: 10.88"W x 5.88"H


Special Feature: [IN] Space-saving Design, Energy-saving


Power Source: ac_dc


Special Features: [IN] Space-saving Design, Energy-saving


Wattage: 3500 watts


Voltage: 120 volts


Flow Rate: 0.9 gpm


Maximum Temperature: 140 °F


Heat Output: 105 °F


Maximum Pressure: 150 psi


Mount Type: Wall


Capacity: 0.9 gallons


Item Dimensions W x H: 10.88"W x 5.88"H


Item Weight: 4 pounds


Item Depth: 3


Brand Name: Rheem


Model Number: RTEX-04T


Number of Items: 1


Manufacturer: Rheem


UPC: 020352758008


Included Components: RTEX-04T Tankless Electric Water Heater


Item Type Name: Tankless Water Heater


Manufacturer Part Number: RTEX-04T


Material Type: Stainless Steel


Color: Gray


Style Name: Point-of-Use, 3.5 kw


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • very nice
Style: Point-of-Use, 3.5 kw
works as Rheem products-reliable and as advertised
Reviewed in the United States on October 1, 2026 by Rick K.

  • The Worst product ever!!
Style: Point-of-Use, 3.5 kw
Absolute Garbage – Avoid the Rheem Brand! I am beyond disappointed with these Rheem point-of-use tankless heaters. I purchased two of these units for my container home project here in Texas, expecting "name brand" quality. Instead, I received two pieces of useless plastic. Neither unit worked right out of the box. I just finished the installation, and they don't heat the water even a single degree. For a company like Rheem to put their name on a product that has a 100% failure rate in my experience is disgraceful. I’ve now missed the 30-day Amazon return window because I was waiting for the right stage of construction to install them, so I am stuck with two expensive paperweights. Do not be fooled by the brand name—their quality control is non-existent. Save your money and your time: DO NOT PURCHASE THIS PRODUCT. ... show more
Reviewed in the United States on February 8, 2026 by Ricardo Hernandez

  • great item
Style: Point-of-Use, 3.5 kw
exactly what we were expecting, works great, easy install
Reviewed in the United States on November 17, 2025 by Amazon Customer

  • Complete disappointment. Failed after just 5 months!
Style: Point-of-Use, 3.5 kw
I bought this Rheem tankless water heater expecting reliability and efficiency. Unfortunately, it has been an absolute nightmare.The unit worked fine for about 5 months. Then, it suddenly started shutting down and displaying the E4 error code continuously, leaving us without hot water.
Reviewed in the United States on June 4, 2026 by George

  • Correct installation
Style: Point-of-Use, 3.5 kw
Works well.
Reviewed in the United States on October 3, 2025 by Amazon Customer

  • Nice Product
Style: Point-of-Use, 3.5 kw
Worked as should.
Reviewed in the United States on April 11, 2025 by Faron Presley

  • Used item
Style: Point-of-Use, 3.5 kw
Purchased a new heater when I received it was a used items d did not work
Reviewed in the United States on February 15, 2026 by steve

  • Great buy
Style: Point-of-Use, 3.5 kw
Works perfectly
Reviewed in the United States on April 26, 2025 by rhonda z

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