Ao Smith 100111065 Blocked Outlet Switch Natural Gas

Product Description

The AO SMITH 100111065 is a blocked outlet switch designed for natural gas, high-efficiency commercial water heaters. This safety component monitors the flue outlet and interrupts the gas valve circuit when a blocked or restricted exhaust condition is detected, helping to prevent unsafe operation. It is a direct-fit replacement part intended for licensed commercial plumbing and mechanical technicians performing service or repair on AO Smith commercial water heating equipment.

This switch is rated for natural gas applications and is used in commercial installations where high-efficiency BTH, SUF, and HCG series water heaters are deployed. Applicable unit capacity ranges include 100-150 and 100-199 input models. It is typically found in light commercial settings such as restaurants, laundries, and multi-unit residential mechanical rooms where AO Smith commercial water heaters are in service.

Key Features

• Blocked outlet safety switch interrupts operation when exhaust flow is restricted
• Rated for natural gas (NG) systems
• Designed for high-efficiency commercial water heater applications
• Compatible with BTH, SUF, and HCG series models in 100-150 and 100-199 capacity ranges
• OEM replacement part — preserves original safety circuit function

Compatibility

Designed for use with AO Smith BTH, SUF, and HCG series commercial natural gas water heaters in the 100-150 and 100-199 input capacity ranges.

Installation Notes

Installation should be performed by a licensed plumber or qualified commercial mechanical technician. Shut off the gas supply and disconnect power to the water heater control circuit before removing or installing this switch. Verify the replacement switch is fully seated and the wiring connections are secure before restoring gas and power. Work should comply with applicable local mechanical codes and the manufacturer's service documentation.

Technical Specifications

• Fuel Type: Natural Gas (NG)
• Efficiency Class: High Efficiency
• Application: Commercial
• Compatible Series: BTH, SUF, HCG
• Compatible Capacity Ranges: 100-150, 100-199

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100111065