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GB100 Atmospheric-vented Hot Water Gas-fired Boiler

The Smith GB100 gas-fired residential boiler is designed to provide dependable, efficient heat. Appreciated for its simplicity and relatively rare need for routine service, the GB100 is available in 5 sizes ranging from 40 to 125 MBH with efficiencies of up to over 82% AFUE.

Low Silhouette

The GB100 features an internal draft diverter that allows venting directly off the top of the already low silhouette. Simple connection of the flue pipe to the boiler collar completes the GB100's venting system for discharge of flue gases.

Sized for Efficiency

You'll appreciate the flexibility offered by the GB100 boiler. Ten different sizes, each with ignition options make it a cinch to size every system for maximum efficiency.

Built and Backed for a Lifetime

Cast iron construction offers superior durability and longer life. Each GB100 Series boiler is full-fired at the factory prior to shipment and is backed by a lifetime warranty (see warranty statement for complete details).
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  • Standing pilot
  • ASME safety pressure relief valve
  • Hi-limit manual reset control
  • Operating temperature control
  • Temperature and pressure gauge
  • Circulator
  • Insulated metal jacket
  • Brass drain valve

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  • Combustible floor base
  • Electronic ignition pilot
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