A.o. Smith 100109846 Electric Water Heater Thermostat

Product Description

The A.O. SMITH 100109846 is an electric thermostat designed for heating control in electric water heater applications. This adjustable thermostat regulates water temperature by signaling the heating element to cycle on and off based on the set point. It mounts directly to the water heater tank and connects via five screw terminals, allowing a technician to secure element and power leads without additional hardware. Plumbers and water heater service technicians install this control as part of routine maintenance or when diagnosing heating failures in residential electric water heater systems.

This thermostat is suited for electric water heater service work in residential settings. It is an adjustable-type control, meaning the temperature set point can be dialed to meet job requirements or local code recommendations. The five-screw terminal configuration supports standard element wiring and makes field replacement straightforward for a trained technician. It is appropriate for upper or lower thermostat positions depending on system configuration and the specific A.O. SMITH unit being serviced.

Key Features

• Adjustable temperature set point for flexible heating control
• Five screw terminals included for secure field wiring connections
• Designed for electric resistance heating applications
• Direct OEM replacement for A.O. SMITH electric water heaters
• Compact control format suited for standard water heater thermostat pockets

Compatibility

Designed as an OEM-style replacement thermostat for A.O. SMITH electric water heater systems with adjustable heating controls.

Installation Notes

Installation should be performed by a licensed plumber or qualified water heater technician. Always disconnect electrical power at the breaker before removing the access panel or handling any thermostat or element wiring. Verify the replacement thermostat matches the voltage and configuration of the existing control before completing the installation. Follow all applicable local electrical codes and manufacturer wiring diagrams during reinstallation.

Technical Specifications

• Application: Heating
• Type: Control
• Adjustability: Adjustable
• Terminal Count: 5 Screws

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: 100109846