Ao Smith 100111038 Combined Controller BTH-120

Product Description

The AO SMITH 100111038 is a combined controller designed as a direct replacement component for the BTH-120 Series water heater. This controller manages the integrated control functions of the water heating system, coordinating ignition, temperature regulation, and safety shutdown sequences. It is installed by licensed plumbers and HVAC technicians servicing commercial or high-demand residential hot water systems. The 100111038 is an OEM-style replacement part built to match the original control specifications of the BTH-120 Series platform.

This combined controller is intended for use in AO SMITH BTH-120 Series 100 water heaters. The BTH-120 Series is typically found in light commercial and high-demand residential applications where reliable, consistent hot water output is required. Technicians replacing a failed controller should verify the series designation and unit configuration before installation to ensure proper fitment.

Key Features

• Direct replacement controller for AO SMITH BTH-120 Series 100 water heaters
• Manages integrated ignition, temperature, and safety control functions
• OEM-style design matches original unit specifications
• Supports standard service and diagnostic workflows for BTH-120 Series platforms

Compatibility

Designed for use with the AO SMITH BTH-120 Series 100 water heater as stated by the manufacturer part designation.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician familiar with commercial water heater controls. Before servicing, shut off the gas supply and disconnect electrical power to the unit following all applicable local codes and IFGC guidelines. Handle all control wiring connections carefully and verify all connections are secure before restoring power. Do not restore gas or power until the controller is fully seated and all connections are confirmed.

Technical Specifications

• Application: BTH-120 Series 100 Water Heater Combined Controller

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100111038