The AO Smith ProLine Commercial Grade GCB-40 400 is a 40-gallon natural gas water heater engineered for high-performance residential or light commercial use. This unit is part of AO Smith’s trusted ProLine series, known for durability, rapid hot water recovery, and long-lasting operation.
Designed to deliver consistent hot water for households of 2–4 people or small businesses, this model features a high BTU input, advanced temperature control, and a heavy-duty anode rod for maximum corrosion protection. Whether you’re replacing an existing unit or building out a new install, this model offers trusted quality and dependable service.
Key Features:
40-gallon tank – ideal for residential or light commercial use
Commercial-grade steel tank and robust components
High BTU input for faster hot water recovery
Factory-installed T&P relief valve and durable drain valve
Advanced thermostat for precise control