55 Gal. Tall Water Heater, Residential, Gas, 50,000 BTU

Rheem Professional Classic Plus 55-Gallon Atmospheric Gas Water Heater – 50,000 BTU, Natural Gas

The Rheem PRO+G55-50N-RH59 is a 55-gallon atmospheric vent natural gas water heater designed to support higher-than-average hot water demands in residential applications. With a 50,000 BTU input and a 51 GPH recovery rate at a 90°F temperature rise, this unit is suited for households requiring rapid recovery and consistent output without upsizing to commercial-grade equipment.

As part of the Professional Classic Plus Series, this model includes enhanced features such as push-button ignition, a low-NOx burner, and a self-diagnostic electronic gas control. The water heater is built with a glass-lined steel tank and a magnesium anode rod to protect against internal corrosion. A factory-installed T&P relief valve and maintenance-free air intake system come standard.

Technical Specifications

• Fuel Type: Natural Gas
• Nominal Capacity: 55 gallons
• BTU Input: 50,000 BTU/hr
• Recovery Rate: 51 GPH @ 90°F rise
• Energy Factor: 0.59 EF (meets NAECA standards)
• Venting Type: Atmospheric vent (vertical, 3" or 4" B-vent)
• Ignition System: Push-button pilot with electronic gas valve
• Water Connections: 3/4" NPT top-mounted
• Tank Protection: Fused glass lining with anode rod
• Diameter: 23-3/4 inches
• Height: 55-7/8 inches
• Warranty: 8-year limited warranty on tank and parts

Installation Guidelines

This model is intended for vertical vent indoor installations using B-vent configurations. No electrical power is required. Installers must verify vent height, gas supply capacity, combustion air requirements, and local code compliance prior to installation. The unit is preconfigured for standard residential LP to NG gas systems with factory T&P relief and meets low-NOx compliance in regulated regions.

Contractor Applications

The PRO+G55-50N-RH59 is a fit for applications where a standard 40 or 50-gallon model lacks sufficient recovery, but where a commercial or high-input unit would be excessive. It offers enhanced tank volume, fast recovery, and a longer warranty—making it a practical choice for high-demand residential settings. Service access is streamlined through diagnostic LED indicators and a non-powered design for flexible utility room placement.