




Ships same day if ordered by 12 pm
Manufacturer pricing rules prevent us from advertising our discount — no account or email required to see it.
Secure Payments
Easy Returns
Expert Advice
Fast Shipping
The AO SMITH 100223770 is an electric thermostat kit designed to regulate water temperature in electric water heaters. The kit provides the sensing and switching components needed to maintain set-point temperatures and protect the heating element circuit during normal operation. It is installed by licensed plumbers and HVAC technicians as a direct service replacement when the original thermostat fails or when a water heater undergoes a controls upgrade.
This thermostat kit is suited for residential electric water heater applications where accurate temperature control is required. Its heating application designation confirms it is intended for use in electric resistance heating systems, making it appropriate for standard tank-style electric water heaters found in homes and light commercial settings.
Designed as an OEM-style replacement thermostat kit for AO SMITH electric water heaters requiring a heating thermostat service component.
Installation should be performed by a licensed plumber or qualified service technician. Before servicing, disconnect electrical power at the breaker and allow the water heater to cool to a safe handling temperature. Follow all applicable local electrical codes and manufacturer wiring diagrams when connecting thermostat leads. Do not restore power until all connections are secure and the access panel is reinstalled.
Thanks for subscribing!
This email has been registered!


