The ProLine® 40-Gallon Atmospheric Vent Short Natural Gas Water Heater is designed to deliver an economical performance that can lower your energy bills and also provide long-lasting value.

Featuring a 40-gallon (nominal) tank and a 40,000 BTU gas burner, the GCBL-40 Standard Vent delivers a first hour rating of 68 gallons and a recovery rate of 41 gallons per hour. It carries a 6-year limited tank warranty, and meets Low NOx emission requirements. This model ships with a supplied insulation blanket.

Environmentally-friendly insulation and factory-installed heat trap nipples reduce heat loss for maximum energy savings.

This ProLine® water heater is designed with A. O. Smith's superior commercial-grade tank protection. Advanced tank features include stainless steel CoreGard™ anode rod, Blue Diamond® glass lining and DynaClean™ automatic sediment-cleaning system, all designed to help protect the tank from the corrosive effects of water and extend the life of the water heater.

A. O. Smith’s ProLine® water heaters are residential products built to commercial-grade standards and are only available for purchase through professional wholesalers and contractors.