Ao Smith 100111056 Blower Prover Switch Natural Propane

Product Description

The AO SMITH 100111056 is a blower prover switch designed for use with both natural gas (NG) and propane (LP) fuel types in high-efficiency commercial water heater applications. This switch monitors combustion air blower operation, confirming that adequate airflow is present before allowing burner ignition. It serves as a critical safety and performance component in commercial gas water heater systems. Licensed service technicians and commercial plumbing contractors are the primary installers of this part. Its dual-fuel compatibility makes it a practical replacement option across a range of commercial water heater configurations.

This blower prover switch is rated for commercial use and is compatible with AO SMITH BTH, SUF, and HCG series water heaters in the following size ranges: 60-120, 100-150, 100-199, and 100-250. These series are commonly found in commercial facilities requiring high-demand hot water supply. The switch is suited for high-efficiency units where blower-assisted combustion and proven airflow are required before burner operation can proceed.

Key Features

• Compatible with both natural gas and propane fuel types
• Designed for high-efficiency commercial water heater applications
• Confirms blower operation before permitting burner ignition, supporting system safety
• Fits BTH, SUF, and HCG series units across multiple capacity ranges
• OEM-style replacement for consistent fit and function

Compatibility

Compatible with AO SMITH BTH, SUF, and HCG series commercial water heaters in the 60-120, 100-150, 100-199, and 100-250 size ranges for both natural gas and propane configurations.

Installation Notes

Installation should be performed by a licensed plumber or qualified commercial water heater service technician. Before servicing, shut off the gas supply and disconnect electrical power to the unit in accordance with local mechanical and electrical codes. Inspect the blower prover tubing and pressure ports for obstructions or damage before installing the replacement switch. Verify correct pressure differential ratings and wiring connections match the existing system before returning the unit to service.

Technical Specifications

• Fuel Type: Natural Gas (NG) and Propane (LP)
• Application: High Efficiency Commercial
• Compatible Series: BTH, SUF, HCG
• Compatible Size Ranges: 60-120, 100-150, 100-199, 100-250

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100111056