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Rheem Tankless water heater Professional Classic Series: Tankless Electric RTEX-04T

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Rheem Residential water heating Tankless water heater Repair, maintenance, and replacement planning
Rheem Professional Classic Series: Tankless Electric RTEX-04T product image

Technical Specifications

Product Specs

  • Efficient Design – UEF up to .95 and advanced self-modulating technology only consumes the power needed to satisfy hot water demand
  • Flow Rate up to 0.25 GPM
  • Digital thermostatic temperature controls in 1-degree increments ranging from80°F - 140°F (26°C - 60°C)
  • Includes two optional 0.35 GPM aerators (flow restrictors) for optimal temperature output and performance
  • Stainless steel heat exchanger reduces corrosion for long life
  • Brass 1/2" NPT fittings located on the bottom for the inlet and outlet water connections
  • SKU: RTEX-04T
  • Warranty Years: 5
  • Model: Professional Classic Series: RTEX-04T
  • Depth: 3"
  • Height: 7"
  • Width: 11"
  • UEF: 0.95
  • Kilowatts: 3.5
  • Water Connector Size 32: 16
  • Amps: 29
  • Recommended Breaker Size: 1 x 30 A Single Pole
  • Voltage: 120
  • RecommendedWireSize: 10 AWG
  • Max Pressure Rating: 150
  • Brand: Rheem
  • Model or series: Professional Classic Series: Tankless Electric RTEX-04T
  • Equipment type: Tankless water heater
  • Product group: Residential water heating
  • System role: Water-heating equipment for domestic or commercial hot-water loads
  • Application: Domestic or commercial hot-water applications when model capacity is appropriate
  • Compatibility check: Verify fuel type, venting, electrical requirements, capacity, controls, and installation clearances.
  • Verified source: rheem.com

Useful troubleshooting details

  • Confirm the exact Rheem model or SKU, serial number, equipment age, and installation location before scheduling service.
  • Share photos of the data plate, equipment cabinet, nearby controls, access area, and any visible leaks, ice, alerts, or error codes.
  • For water-heating equipment, note hot-water symptoms, temperature swings, pressure concerns, venting, condensate, scale, and maintenance history.
  • Imported official SKU example: RTEX-04T.

Service planning

How GreenFlow handles Professional Classic Series: Tankless Electric RTEX-04T requests

1

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

2

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

3

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

4

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

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Our Happy Customers

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

Neal V.

In an industry that often fraught with contractors taking advantage of homeowners, Andrey was honest with his assessment and willing to install a product acquired elsewhere (most want that margin themselves), patiently answered my questions (I’m an engineer so like to understand what’s happening), and proactively offered practical...

Michael C.

always available, easy to get a hold of, as a property manager I get lots no heat emergency, usually get to it same day or next day

Anna G.

They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.

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