A. O. Smith ProLine GCF-50 standard vent delivers a first-hour rating of 84 gallons and a recovery rate of 42 gallons per hour. It comes with a 50-gallon (nominal) tank and a 40,000 BTU gas burner. With electronic ignition and automatic flue damper for convenience and energy savings. 







Why Choose Our Product


  • Energy Star Qualified

  • Automatic Flue Damper

    Improved efficiency as the flue damper automatically opens and closes to reduce heat loss when in standby.

  • Electronic Gas Control

    Intelligent control logic with precision sensors and fast response optimizes operating performance

    LED status indicator monitors operation and service diagnostics

  • Electronic Ignition

    Heater operates with an automatic pilot relight system for enhanced ease of use and reduced gas consumption

    Requires 110-120V power

  • Green Choice Gas Burner

    Eco-friendly burner design complies with Low-NOx emission requirements

  • Dynaclean Diffuser Dip Tube

    Reduces lime and sediment buildup

  • Coregard Anode Rod

    Anode rod with stainless steel core provides superior tank protection

  • Blue Diamond Glass Coating

    Commercial-grade glass coating provides superior corrosion resistance

  • Enhanced-flow Brass Drain Valve

    Solid brass, tamper resistant, ball type drain valve designed for easy operation

  • CSA Certified and ASME Rated T&P Relief Valve

    Temperature and pressure relief valve protects the tank against excessive temperature and pressure

  • Code Compliance

    Meets UBC, CEC, and HUD National Code.

    Meets the thermal efficiency and standby loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IES 90.1

    Complies with the Energy Policy and Conservation Act (EPCA)

    Listed according to ANSI Z21.10.1 - CSA 4.1 standards governing storage tank-type water heaters

    Certified at 300 psi test pressure and 150 psi working pressure


Nominal Capacity 50 gal (189 L)
Rated Storage Volume 48 gal (181 L)
UEF 0.69
First Hour Rating 84 gal
Input (BTU/hr) 40,000
Recovery @ 90°F Rise 42 gal per hour
Ignition Mode Electronic ignition*
Dimensions (Height x Diameter) 63.5" x 22"
Weight 167 lbs
Water Connections 3/4" NPT
Gas Connection 1/2"

*Requires 120 VAC power supply

User Manual and Leaflets