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Quick specs
Part Type
Pilot assembly with thermopile & tubing
Fuel
Propane (LP)
Fits
A.O. Smith water heaters
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
A.O. SMITH Pilot Assembly Thermopile w/ Tubing (Propane) 100093983
Genuine OEM A.O. Smith Kit·Flame Safety Monitoring
$102.72
-
- Free shipping — most items ship by the next day
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Secure payment
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A.O. SMITH Pilot Assembly Thermopile w/ Tubing (Propane) 100093983
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
In stock
In most items, small items ship same day. Complete systems ship next business day.
$102.72
-
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
Quick specs
Part Type
Pilot assembly with thermopile & tubing
Fuel
Propane (LP)
Fits
A.O. Smith water heaters
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
A.O. SMITH Pilot Assembly Thermopile w/ Tubing (Propane) 100093983
Genuine OEM Replacement Part
Restore reliable hot water fast with the A.O. Smith 100093983 Liquid Propane Pilot Assembly, Thermopile, and Tubing Kit — the genuine OEM replacement part engineered to get your propane gas water heater back up and running safely.
What It Does
This component monitors the gas pilot flame and ensures safe operation by automatically shutting off the gas supply in the event the flame goes out. The 750-millivolt thermopile system provides the necessary electrical potential to hold the gas valve electromagnetic coil open without requiring external power.
What’s Included
This complete kit includes the thermopile generator, high-temp pilot tubing, and specialized mounting bracketry to maintain proper flame rectification and standby pilot stability.
Premium Build Quality
The stainless steel pilot head resists carbon buildup and thermal fatigue the most common failure points in water heater pilot assemblies delivering long-lasting, dependable performance.
Compatible Models
Designed for residential propane gas water heaters, this assembly fits multiple A.O. Smith, Reliance, American Water Heater, and Kenmore models including GCV40, GS640, XCRT40, L30S61-303, L40S62-403, L50T61-403, and more. It is the direct OEM replacement for legacy part numbers 321165-001 and 100078038.
When to Replace
Typical failure signs include the pilot failing to stay lit after releasing the control knob, or the main burner failing to ignite despite a healthy pilot flame — both pointing to a thermopile that can no longer reach the required millivolt threshold.
LP Use Only: This assembly is configured with an LP (Liquid Propane) orifice. Using it in a natural gas application will result in improper combustion and potential safety hazards. For natural gas units, a separate part is required.
Key Specifications
- Part Number: 100093983
- Brand: A.O. Smith (also fits Lochinvar & Reliance)
- Gas Type: LP / Liquid Propane
- Component Type: Pilot Assembly with Thermopile & Tubing
- Condition: Brand New, Factory Packaged
- OEM Genuine Part: Yes
Why homeowners choose NAW
Genuine OEM parts
Every part we sell is the real thing — authorized, factory-genuine, and backed by the full manufacturer warranty.
Easy online ordering
Find your part by model number, add to cart, and get it delivered to your door — no middleman, no markup.
30-day hassle-free returns
Ordered the wrong part? Send it back within 30 days.
Help when you need it
Not sure if this is the right part? Call us at (888) 292-0874 and we’ll help you find the correct replacement.
Key features
- Genuine OEM A.O. Smith Kit — liquid propane pilot assembly, thermopile and tubing
- Flame Safety Monitoring — automatically shuts off gas if the pilot goes out
- 750 mV Thermopile — powers the gas control for reliable operation
- Restore Hot Water Fast — exact replacement for propane water heaters
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