the Normally Closed function ensures the valve returns to the closed position immediately upon loss of 24V power for system safety

this Wayne tune-up kit excludes the electrode bracket holder (P/N 21679)

Utilizing a 30132030 PC board restores the operational integrity of your unit

setpoint but includes a Uni-Kit for field conversion to LP Gas (11

Viessmann 7819971 Air Vent 318423-701 the Normally Closed function ensuresThe Viessmann 7819971 Air Vent with Shut Off Base is a critical component for maintaining hydraulic stability in high performance condensing systems. Engineered specifically for the Vitodens series, this G3 8" automatic air vent facilitates continuous air elimination from the primary heat exchanger loop, preventing airlocks that compromise heat transfer and cause circulator cavitation. This OEM part is the direct replacement air vent for Viessmann