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Rheem Commercial gas water heater Universal Low NOx

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Rheem Commercial water heating Commercial gas water heater Repair, maintenance, and replacement planning
Rheem Universal Low NOx product image

Technical Specifications

Product Specs

  • 35 to 100-Gallon Capacities
  • 125,000-399,900 BTU/h
  • Top-Front-Rear Inlet/Outlet Water Connections
  • Ultra Low NOx performance, less than 40 ng/J
  • Capacity 35-100
  • SKU: GN100-270(A)
  • Warranty Years: 3
  • Model: Universal Low NOx
  • Tank Capacity: 100
  • Fuel: Natural Gas
  • Height: 66.13"
  • Width: 30.25"
  • LowNox: Yes
  • Brand: Rheem
  • Model or series: Universal Low NOx
  • Equipment type: Commercial gas water heater
  • Product group: Commercial water heating
  • System role: Water-heating equipment for domestic or commercial hot-water loads
  • Application: Commercial, light-commercial, or managed-building HVAC and water-heating applications
  • 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: GN100-270(A).

Service planning

How GreenFlow handles Universal Low NOx 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...

Jenny W.

Great service! On time, knowledgeable & professional

Jack B.

Andrey always does a great job.

Michele Z.

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

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