The AO Smith – Water Heater Igniter 100109906 is a genuine replacement igniter designed to restore proper burner ignition in select AO Smith gas water heaters.
Full Product Specification:
Part Type: Hot Surface Igniter
Part Code: 100109906 / 9004519205 ( Older Part Code )
Use: Gas water heater ignition
Also Compatible With:
- BTH-120 Thru 250 Old Numbers # 192638 and 192638-B.
- Replaces part numbers 192638-000, 9004519205, 192638
What’s Included
1× AO Smith Water Heater Igniters (ready to install)
Why Choose Direct Brand?
Trusted Since 2001
Direct Brand has supplied reliable heating and water heater replacement parts across the U.S. for more than two decades.
Fast Processing & Shipping (USA)
We work efficiently to get your order shipped and delivered as soon as possible.
Clear Product Code Guidance
We list both new and older part codes to make confirming compatibility simple.
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FAQs
Q1: Will this igniter fit my AO Smith water heater?
If your unit lists igniter 100109906 or older code 9004519205, this genuine replacement is designed to fit.
Q2: Can I install this igniter myself?
This part should be installed by a qualified engineer or technician to ensure safe operation and avoid damage to the water heater.
Q3: What is the difference between 100109906 and 9004519205?
100109906 — Newer, updated code
9004519205 — Older reference code found in previous AO Smith manuals
