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Point-of-use water heater

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Rheem Point-of-use water heater Marathon Point-of-Use

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Rheem Residential water heating Point-of-use water heater Repair, maintenance, and replacement planning
Rheem Marathon Point-of-Use product image

Technical Specifications

Product Specs

  • Featuring the same unique design as the Marathon, but in smaller capacities
  • Ideal for condos, cabins and light-duty commercial applications
  • 15 and 20 gallon capacities
  • SKU: MR20120
  • Model: Marathon Point-of-Use
  • Height: 30.5"
  • High Efficiency: Yes
  • Official SKU example: MR20120
  • Official product category: Point-of-use water heater
  • Official source page: https://www.rheem.com/product/rheem-marathon-point-of-use-mr20120/
  • Brand: Rheem
  • Model or series: Marathon Point-of-Use
  • Equipment type: Point-of-use water heater
  • Product group: Residential 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: MR20120.

Service planning

How GreenFlow handles Marathon Point-of-Use 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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Michele Z.

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

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...

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

Dev W.

I had a breakdown of my cooling system and Hanna at Green Flow responded to my request right away. They scheduled me same day. The team at Green Flow was easy to communicate with over phone and text. They kept me updated on delays on arrival of the...

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