Knox Sales Company Sk 230063 / 4100HL Pb Upper Thermostat

Product Description

The KNOX SALES COMPANY SK 230063 / 4100HL PB is an upper thermostat designed for electric water heaters equipped with a heating element. It monitors and regulates water temperature at the top of the tank, cycling the upper heating element on and off to maintain the setpoint. This is a 3-point thermostat, meaning it connects via three electrical terminals. Licensed plumbers and HVAC technicians install this part during routine thermostat replacement or when troubleshooting inconsistent hot water output on residential electric water heater systems.

This upper thermostat is intended for use in residential electric water heater applications where the tank relies on a two-element configuration. The upper thermostat takes priority during the heating cycle, bringing the top portion of the tank to temperature before the lower element engages. It is a direct replacement part suited for standard electric tank-style water heaters using a 3-point upper thermostat configuration.

Key Features

• 3-point terminal connection for upper element control
• Upper position thermostat for priority heating in two-element systems
• Direct OEM-style replacement design
• Compact form factor suited for standard water heater thermostat pockets

Compatibility

Designed as an OEM-style replacement upper thermostat for residential electric tank water heaters requiring a 3-point upper thermostat.

Installation Notes

Installation should be performed by a licensed plumber or qualified technician. Before servicing, disconnect electrical power to the water heater at the breaker panel and verify power is off with a non-contact voltage tester. Remove the access panel and insulation to reach the thermostat bracket. Follow all applicable local electrical codes and manufacturer wiring diagrams when reconnecting terminals.