AO Smith 100112339 10" WC Gas Valve (LP)
A propane (LP) water heater gas valve used to control gas flow and temperature regulation on compatible units that specify this exact replacement part.
Key Features:
- LP gas valve rated at 10" water column (WC)
- Application listed: Heating
- SupplyHouse lists this item as replacing: 100093978, WV8840B5077, 9007891005, 6911136
Compatibility & Applications:
- Listed under AO Smith water heater parts (Gas Valves - Commercial)
- Q&A repeatedly indicates gas valves are unit-specific; compatibility should be confirmed by the water heater model/serial and the manufacturer-specified part number
- Q&A confirms it is an LP/propane valve and includes direct-replacement confirmation for WV8840B5077 in at least one case
- Must only be used where the manufacturer specifies this exact part number: 100112339
Installation & Operation Notes:
- Installation should be performed by a qualified service technician
- Follow the water heater's service/installation manual for the correct removal/installation procedure and checkout
- Reviews/Q&A note real-world service considerations such as difficulty removing an old valve from the tank on some installs (some users swap the internal circuit/control component instead of removing the entire valve body); follow the equipment documentation for the approved service method
Maintenance & Troubleshooting:
- This part is commonly replaced when a water heater's gas valve/thermostat starts "acting up," causes inconsistent hot water, or won't operate correctly at normal settings
- Reviews describe successful repairs where replacement restored normal firing and made the heater operate properly even on lower temperature settings
- If problems persist after replacement, troubleshooting should continue per the water heater service manual (model/serial verification, correct fuel type, and correct replacement part selection)
User Reviews & Q&A Summary:
- Common review themes: correct part received, fixed the problem, and restored reliable hot water; many mention straightforward installation when the old valve is removable
- Repeated purchasing themes: easy to find the right replacement and fast shipping; several reviewers bought it specifically for older units
- Recurring cautions: a few reviewers mention these valves can fail over time and that replacement is sometimes "only when necessary" due to cost/effort
- Q&A themes: strong emphasis on confirming fit by model/serial; confirmed LP/propane use; confirmed direct replacement for WV8840B5077 in at least one case; and clarified it is not a universal cross-over for other brands