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

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

The Rheem PRO+G50S-40N-RH61 is a 50-gallon, short-profile, natural gas-fired water heater engineered for residential applications requiring consistent hot water delivery and installation in low-clearance utility spaces. With a 40,000 BTU/hr input and a recovery rate ranging from 30.3 to 40.4 gallons per hour at a 90°F rise, this model supports high-demand usage while maintaining energy efficiency and durability.

Part of the Professional Classic Plus series, this model includes a push-button ignition system, low-NOx burner, and electronic gas control with integrated diagnostics. It is constructed with a glass-lined tank, factory-installed T&P relief valve, and corrosion-resistant anode rod. The power-free design and atmospheric venting configuration make it well suited for retrofit installations without access to electrical outlets.

Technical Specifications

• Fuel Source: Natural Gas
• Tank Capacity: 50 gallons
• BTU Input: 40,000 BTU/hr
• Recovery Rate: 30.3 to 40.4 GPH @ 90°F temperature rise
• Energy Factor (EF): 0.61 (NAECA compliant)
• Venting Type: Atmospheric, vertical through 3" or 4" B-vent
• Ignition: Push-button pilot with electronic gas valve
• Water Connections: 3/4" NPT (top-mounted)
• Diameter: 23"–24" (varies slightly by production)
• Height: Approximately 54" (short model configuration)
• Warranty: 8-year limited warranty (tank and parts)

Installation Considerations

This unit is intended for vertical B-vent installations and does not require electrical power. Proper combustion air supply, draft verification, and gas line sizing must be confirmed prior to commissioning. Venting components must be sloped and terminated in accordance with local code and the manufacturer's requirements. Installation by a licensed plumbing or HVAC professional is strongly recommended for compliance and performance validation.

Contractor Applications

The PRO+G50S-40N-RH61 is well-suited for replacement installations in basements, closets, or utility rooms with limited headroom. The short-tank profile offers flexibility without compromising capacity, and its high recovery rate makes it viable for residences with elevated hot water consumption. Self-diagnostic features, durable components, and industry-standard connection points simplify service and setup.