Tjernlund WHK-E Water Heater InterlockWater 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

maintaining steady water pressure across systems

It is specifically intended for use with the GMNT040-3B

with a standard 1/230 V supply and 1/4 HP output to support efficient cooling cycles

supporting a robust 1400 CFM flow and a low pressure drop of 0

Compact form factor for easy panel mounting

The Hydrolevel 750SV Boiler Low Water Cut-Off provides reliable protection for commercial and industrial boilers

This red-housed control automatically monitors the outlet temperature of fan type standard power vent or separated combustion unit heaters and interrupts the burner circuit when the 160°F limit is reached

and improve overall air freshness

and serves as a reliable water heater control with high‑limit protection

The Goodman CBK2PD240VC060S circuit breaker is a reliable 2-pole dual unit designed for 120/240V systems and a 60A rating

It helps technicians quickly verify safe operation during routine maintenance

Designed for HVAC systems with a maximum static pressure of 1 inch WC and a pressure drop under 0