Electronic Ignition, Natural Gas Boiler, 67K BTU,

Williamson GWA-067-N-T-S3-W – 67,000 BTU Natural Gas Atmospheric Boiler, Series 3

The Williamson GWA-067-N-T-S3-W is a gas-fired, cast iron water boiler designed for reliable hydronic heating in residential applications. With a 67,000 BTU input and an 84% AFUE rating, this Series 3 model offers dependable performance and energy-conscious operation for small to mid-sized heating zones.

Constructed with cast iron sections and equipped with factory-assembled controls, the GWA-067 is a natural draft, atmospheric vent boiler with electronic spark ignition. It ships complete with key components including a vent damper, pressure-temperature gauge, relief valve, and circulator, streamlining setup for field installation.

Core Features

• Cast Iron Heat Exchanger: Precision-machined and pressure-tested for long-term performance and thermal stability.
• Electronic Ignition System: Eliminates standing pilot, improving ignition safety and operational efficiency.
• Integrated Low Water Cut-Off: Protects the heat exchanger by preventing operation under insufficient water conditions.
• Natural Draft Venting: Designed for conventional B-vent installations with 4” vent connection.
• Compact Cabinet: Small footprint with service-friendly front panel access for maintenance.

Technical Specifications

• Model: GWA-067-N-T-S3-W
• Input: 67,000 BTU/h
• DOE Heating Capacity: 58,000 BTU/h
• Net AHRI Rating: 50,000 BTU/h
• AFUE: 84%
• Fuel Type: Natural Gas
• Vent Size: 4-inch
• Water Content: 2.1 gallons
• Circulator: Factory-mounted (Taco 007 or equivalent)
• Ignition: Electronic spark ignition

Installation Considerations

The GWA-067 is designed for ease of installation in retrofit and new construction settings. Top-mounted supply and return tappings allow for flexible piping configurations. Venting must conform to natural draft requirements using approved B-vent material. Gas supply sizing and combustion air should be verified per site conditions. All electrical and hydronic connections are accessible via front service panel.

Contractor Notes

Contractors will appreciate the straightforward wiring terminal block, pre-assembled circulator and controls, and easily accessible clean-out ports. The boiler’s compact footprint allows for installation in tight mechanical spaces while maintaining clearance for service. The low water cut-off and vent damper are prewired to simplify code-compliant installations.

Application Scope

• Single-zone residential heating systems
• Multi-zone setups using circulators or zone valves
• Systems requiring natural draft venting and cast iron durability