A. O. Smith's ProLine 401 Series gas water heaters deliver an economical performance suitable for large homes, restaurants and gyms compared to electrical heaters.

GCR-50 features a 50-gallon nominal capacity and a 37,000 BTU propane burner, delivering a first hour rating of 84 gallons and a recovery rate of 43 gallons per hour.


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 piezo ignition with an electronic gas valve. When cold water enters the heater, the temperature sensor signals the 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.




Why Choose Our Product




    The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance.

    The electronic gas control incorporates an LED status indicator that monitors system operation and service diagnostics.

  • 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

  • Push-button Piezo Ignitor

    Push-button spark ignition for easier and faster lighting

  • Factory-installed Nipples

    For faster installation

  • 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 pressur

  • High Uniform Energy Factor

    Eco-friendly non-CFC foam insulation, external heat traps, and specially designed combustion chamber for operating cost savings

  • Code Compliance

    Meets UBC, CEC, and ICC 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

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

    Certified at 300 psi test pressure and 150 psi working pressure

Nominal Capacity50 gal (189 L)
Rated Storage Volume48 gal (181.7 L)
First Hour Rating81 gal
Input (BTU/hr)37,000
Recovery @ 90°F Rise43 gal per hour
Ignition ModePiezo-ignited
Dimensions (Height x Diameter)60.75" x 22"
Weight165 lbs
Water Connections3/4" NPT
User Manual and Leaflets
Attachment Size
ProLine Gas Heater Spec Sheet.pdf 318.04 KB
GCR-50 User Manual.pdf 1.42 MB