40 Gal. Tall Water Heater, Residential, Gas, 40,000 BTU

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

The Rheem PRO+G40-40N-RH62 is a 40-gallon, tall-profile, atmospheric vent water heater engineered for residential use. Designed with a 40,000 BTU/hr low-NOx burner and push-button pilot ignition, this unit delivers a recovery rate of 40.4 gallons per hour at a 90°F temperature rise, supporting consistent hot water delivery in medium-demand household applications.

This model features a glass-lined steel tank with anode protection, factory-installed temperature and pressure relief valve, and maintenance-free air intake system. It operates without filters or external components, minimizing service intervals and simplifying installation in standard vertical B-vent configurations.

Technical Specifications

• Fuel Source: Natural Gas
• Nominal Capacity: 40 gallons
• Input Rating: 40,000 BTU/hr
• Recovery Rate: 40.4 GPH @ 90°F rise
• Energy Factor (EF): 0.62
• Ignition System: Push-button pilot with hot surface ignition
• Venting: 3” or 4” vertical B-vent
• Water Connections: 3/4" NPT, top-mounted
• T&P Valve: Factory-installed
• Tank Protection: Glass-lined with magnesium anode rod
• Height: 60 inches
• Diameter: 19-1/2 inches
• Warranty: 8-year limited warranty on tank and parts

Installation and Code Compliance

This model is intended for indoor installation with vertical venting. A standard atmospheric vent setup must be verified for draft and combustion air availability. No electrical connection is required. Installation must be completed by a licensed professional to comply with local codes regarding gas supply, venting, and safety systems.

Applications and Use Case

The PRO+G40-40N-RH62 is designed for replacement and new construction where a reliable, mid-capacity natural gas unit is required. It is suitable for 1-2 bathroom homes and fits within most existing footprints for B-vent systems. The model includes service-friendly diagnostics through the integrated gas control system and requires no ongoing maintenance of air intake components.