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Rheem Tankless water heater Professional Classic Series Tankless Electric RTEX-3.5, RTEX-06 kW

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Rheem Residential water heating Tankless water heater Repair, maintenance, and replacement planning
Rheem Professional Classic Series Tankless Electric RTEX-3.5, RTEX-06 kW product image

Technical Specifications

Product Specs

  • UEF up to 0.95
  • Flow Rate up to 1.6 GPM (See specification sheet for the GPM on each model)
  • Digital temperature control in 1-degree increments ranging from 80°F - 140°F (26°C - 60°C)
  • Two 0.35 GPM aerators are included for optimal temperature output and performance
  • SKU: RTEX - 06
  • Warranty Years: 5
  • Model: Professional Classic Series Tankless Electric RTEX-3.5, RTEX-06 kW
  • Depth: 3"
  • Height: 7"
  • Width: 11"
  • UEF: 0.94
  • High Efficiency: Yes
  • Kilowatts: 6.5
  • Water Connector Size 32: 16
  • Amps: 27
  • Recommended Breaker Size: 1 x 30 A Double Pole
  • Voltage: 240
  • RecommendedWireSize: 10 AWG
  • GPMTurnOn: 0.25
  • Max Pressure Rating: 150
  • Brand: Rheem
  • Model or series: Professional Classic Series Tankless Electric RTEX-3.5, RTEX-06 kW
  • 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 - 06.

Service planning

How GreenFlow handles Professional Classic Series Tankless Electric RTEX-3.5, RTEX-06 kW 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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Sharad W.

Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...

Murali S.

HVAC technician was punctual, followed up well, completed quick repairs, ensured the issue was resolved, and provided helpful recommendations.

Michele Z.

Andrey was professional, prompt, smart, thorough and exceedingly pleasant. We are likely switching our current HVAC company to Green Flow.

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

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