Tjernlund WHK-E Water Heater Interlock

Water Heater Interlock from the Tjernlund WHK-E series delivers essential safety control for millivolt gas water heaters. This reliable interlock is designed for use on UC1/MAC models and comes complete with the gas pressure switch, a linear limit flue gas spill switch, and a thermocouple junction adapter.

Ideal for millivolt gas water heater safety and gas control interlock applications, the WHK-E helps ensure safe ignition and shutdown sequences while preventing unwanted gas flow. Its compact, durable build simplifies service replacement and preserves existing connections for quick installation.

Designed for dependable performance in confined spaces, the WHK-E supports quick installation in retrofit setups and aligns with UC1/MAC brand requirements. It helps reduce troubleshooting time by consolidating critical safety components into one interlock assembly, making it a smart upgrade for older gas water heating systems.

• Includes Gas Pressure Switch
• Includes Linear Limit Flue Gas Spill Switch
• Includes Thermocouple Junction Adapter
• Designed for Millivolt Gas Water Heaters
• Compatible with UC1/MAC models