A.O. Smith

A.O. Smith® 100158803 GCB-40 40 Gallon Gas Water Heater, Natural Gas Fuel, Atmospheric Vent

AOSGCB40NMAR MFG #: 100158803
A.O. Smith® 100158803 GCB-40 40 Gallon Gas Water Heater, Natural Gas Fuel, Atmospheric Vent
  • Recovery Rate: 42 gph at 90 deg F
  • Tall or Short: Tall
  • Tank Capacity: 40 gal
  • Vent Type: Atmospheric Vent
  • Dimensions: 18 in Dia x 62 in H
  • Manufacturer: A.O. Smith
  • Manufacturer #: 100158803
  • Pressure Rating: 150 psi
  • Series: GCB-40
The ProLine® 400/401 Series gas water heater is designed to deliver an economical performance that can lower your energy bills and also provide long-lasting value.

Looking for model-specific repair or replacement parts? Enter the unit’s serial number into the A.O. Smith Parts Finder.

A.O. Smith® ProLine® Gas Water Heater, Series: GCB-40, 40000 Btu/hr Heating, Natural Gas, 1/2 in Gas Connection, 40 gal Tank, Piezo Pushbutton Ignition, Atmospheric Vent, 3 in, 4 in Vent, 42 gph at 90 deg F Recovery, Energy Factor: 0.65, 3/4 in Water Connection, 150 psi, Tall or Short: Tall, Ultra Low Nox: No, 18 in Dia x 62 in H
  • Features
  • Includes
  • Intelligent control logic - The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance
  • Uses a thermopile to generate the power needed to operates the electronic gas control without requiring an external power source
  • The electronic gas control incorporates an LED status indicator that monitors system operation and service diagnostics
  • Green Choice® gas burner - Patented "Eco-Friendly" design reduces NOx emissions by up to 33% and complies with low- NOx emission requirements of less than 40 ng/J
  • Dynaclean™ diffuser dip tube - Reduces lime and sediment build up and maximizes hot water output, made from long-lasting PEX cross-linked polymer
  • Coregard™ anode rod - Our anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection for longer than standard anode rods
  • Pushbutton piezo ignitor - Makes lighting the pilot fast and easy with one-hand pushbutton spark ignition
  • Heat trap nipples Factory installed for faster installation
  • Blue Diamond® glass coating - Provides superior corrosion resistance compared to industry standard glass lining
  • Enhanced-flow brass drain valve - Our residential water heaters have a solid brass, tamper resistant, enhanced-flow, ball type, drain valve
  • Uses a standard female hose fitting that allows for fast and easy draining during maintenance
  • Designed for easy operation, this valve includes an integral screwdriver slot that features a 1/4 turn (open/close) radius, which not only permits full straight-through water flow but also a quick and positive shut off
  • High energy factors - Eco-Friendly Non-CFC foam insulation, external heat traps and specially designed combustion chamber combine to produce a high Energy Factor for maximum savings on operating costs
  • Approved for installation from sea level to 10100 ft elevation
Insulation Blanket