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. 


How It Works

LPG-fired water heaters heat by burning propane gas to heat water efficiently. These need a source of fresh air and need proper venting.

Cold water enters through a dip tube which forces the cold water to go to the bottom of the tank and pushes hot water out through the outlet connection.

This heater uses automatic electronic ignition and control system. When cold water enters the heater, the temperature sensor signals the flue damper and gas valve to open. Gas flows to the burner and is ignited by the pilot light. When the target temperature is reached, the gas valve shuts off and the flue damper automatically closes to reduce standby heat loss.




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 pressu

  • 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 Capacity50 gal (189 L)
Rated Storage Volume48 gal (181 L)
First Hour Rating84 gal
Input (BTU/hr)40,000
Recovery @ 90°F Rise42 gal per hour
Ignition ModeElectronic ignition*
Dimensions (Height x Diameter)63.5" x 22"
Weight167 lbs
Water Connections3/4" NPT
Gas Connection1/2"

*Requires 120 VAC power supply

User Manual and Leaflets
Attachment Size
ProLine XE Gas Heater Spec Sheet.pdf 276.48 KB