50 Gal. Short Water Heater, Residential, Gas, 40,000 BTU

Rheem Professional Classic 50-Gallon Short Natural Gas Water Heater – 40,000 BTU, Atmospheric Vent

The Rheem PROG50S-40N-RH61 is a 50-gallon, short-profile atmospheric vent water heater designed for residential applications requiring dependable performance and faster recovery. Featuring a 40,000 BTU/hr input and a recovery rate of 40.4 GPH at a 90°F rise, this unit is suitable for homes with moderate to high hot water demand. Its shorter form factor allows for easier installation in spaces with limited vertical clearance.

This model includes a low-NOx burner, push-button ignition, and an electronic gas control valve with integrated diagnostics. The unit meets NAECA energy efficiency standards and is constructed with a glass-lined steel tank and magnesium anode rod for corrosion resistance.

Technical Specifications

• Fuel Type: Natural Gas
• Nominal Capacity: 50 gallons
• Input Rating: 40,000 BTU/hr
• Recovery Rate: 40.4 gallons per hour at 90°F rise
• Uniform Energy Factor (UEF): 0.61
• Venting Type: Atmospheric, vertical B-vent (3" or 4")
• Ignition: Push-button pilot with electronic gas valve
• Water Connections: 3/4" NPT, top-mounted
• Tank Protection: Fused glass-lined tank with magnesium anode rod
• Diameter: 23-3/4 inches
• Height: 54-1/4 inches
• Warranty: 6-year limited warranty on tank and parts

Installation and Service Considerations

This unit is designed for vertical vented installations and does not require electrical power, making it suitable for mechanical rooms and retrofit scenarios with no existing outlet. Proper vent sizing, combustion air access, and gas line capacity should be confirmed prior to installation. The maintenance-free air intake system simplifies ongoing service, and the integrated diagnostics aid in troubleshooting.

Contractor Applications

The PROG50S-40N-RH61 is ideal for installations requiring a short tank footprint, such as closets, basements, or crawlspaces. The 50-gallon storage capacity paired with rapid recovery supports high-usage residential environments. Self-diagnostic controls, standard water connections, and low-maintenance burner design reduce labor and callbacks during and after install.