A.o. Smith 100109948 Hot Surface Silicon Nitride Igniter

Product Description

The A.O. SMITH 100109948 is a hot surface silicon nitride igniter designed for use in heating equipment. This igniter replaces the traditional standing pilot or spark ignition system, using electrical resistance to generate the surface heat needed to ignite the burner. Silicon nitride construction provides durability and resistance to thermal shock compared to older silicon carbide designs. Licensed HVAC technicians and plumbers install this component as part of routine ignition system service or repair on gas-fired heating equipment.

This igniter is intended for heating applications where a hot surface ignition system is specified. It is suited for residential and light commercial gas heating equipment that relies on hot surface ignition to initiate the main burner sequence. Installation is performed as a direct replacement when the original igniter fails to reach ignition temperature or shows visible cracking or damage.

Key Features

• Silicon nitride element for improved thermal shock resistance
• Hot surface ignition design eliminates standing pilot requirements
• Engineered for gas-fired heating equipment applications
• OEM-style replacement for serviceability and fit

Compatibility

Designed as an OEM-style replacement igniter for gas-fired heating equipment requiring hot surface ignition. Verify fitment against the original equipment model number and igniter specifications before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified service professional. Shut off gas supply and disconnect electrical power to the unit before beginning igniter replacement. Handle silicon nitride igniters with care to avoid contact with skin oils, which can reduce service life. Work should conform to applicable local codes and the equipment manufacturer's service documentation.

Technical Specifications

• Application: Heating
• Igniter Type: Hot Surface Silicon Nitride

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: 100109948