Vaillant 104521 Automatic Air Vent

Vaillant 104521 Automatic Air Vent 

An automatic air vent designed for the pump section of Vaillant boilers in:

• Guernsey/Jersey only (condensing)
• ecoFIT VU (condensing)
• ecoFIT VUW (condensing)
• ecoTEC VU (condensing)
• ecoTEC VUW (condensing)
• Home (condensing)
• THERMOcompact VU (fan-assisted)
• TURBOmax VUW (fan-assisted)
• ecoTEC VUI (condensing) boilers.