VAILLANT 104521 AUTOMATIC AIR VENT
Product Information: The automatic air vent is a safety device within the central heating unit. They work by using buoyancy to release built up air. As water flows through the heating/cooling system, a float within the automatic air vent opens or closes depending on the water level. If the system is full of water, the float will be pushed to the top and the vent will be closed until the water level drops.
This part is present in 133 different boilers in the Vaillant range including the Vaillant ecoTEC PLUS (2005-2010), ecoTEC PLUS (2005-2010), ecoTEC PLUS (2005-2010), ecoTEC exclusive 832 , TURBOmax PRO (2002-2008).
Specifications
Supplier Part Number: 104521
Part Description: Vaillant 104521 Automatic Air Vent
This Product Fits:
Vaillant ecoTEC exclusive 832 (2007-201 GC: 4704437
Vaillant ecoTEC exclusive 838 (2007-201 GC: 4704438
Vaillant ecoTEC PLUS 612 GC: 4104444
Vaillant ecoTEC PLUS 612 GC: 4104444
Vaillant ecoTEC PLUS 615 GC: 4104445
Vaillant ecoTEC PLUS 615 GC: 4104445
Vaillant ecoTEC PLUS 618 GC: 4104446
Vaillant ecoTEC PLUS 618 GC: 4104446
Vaillant ecoTEC PLUS 624 GC: 4104447
Vaillant ecoTEC PLUS 624 GC: 4104447
Vaillant ecoTEC PLUS 630 GC: 4104450
Vaillant ecoTEC PLUS 630 GC: 4104450
Vaillant ecoTEC PLUS 637 GC: 4104485
Vaillant ecoTEC PLUS 824 GC: 4704440
Vaillant ecoTEC PLUS 824 GC: 4704440
Vaillant ecoTEC PLUS 831 GC: 4704432
Vaillant ecoTEC PLUS 831 GC: 4704432
Vaillant ecoTEC PLUS 837 GC: 4704442
Vaillant ecoTEC PLUS 937 GC: 4704443
Vaillant ecoTEC PRO 24 GC: 4704444
Vaillant ecoTEC PRO 28 GC: 4704455
Vaillant TURBOmax PLUS 824 E GC: 4704404
Vaillant TURBOmax PLUS 824 E GC: 4704404
Vaillant TURBOmax PLUS 828 E GC: 4704409
Vaillant TURBOmax PLUS 837 E GC: 4704428
Vaillant TURBOmax PRO 24 E GC: 4704410
Vaillant TURBOmax PRO 28 E GC: 4704411
Vaillant VU 05/03/0126 (2005-2005) GC: 4104444
Vaillant VU 126/3-5 (2005-2010) GC: 4104444
Vaillant VU 152/2-5 R1 (2002-2004) GC: 4104423
Vaillant VU 152/2-5 R3 (2004-2008) GC: 4104423
Vaillant VU 156/3-5 (2005-2005) GC: 4104445
Vaillant VU 156/3-5 R1 (2005-2010) GC: 4104445
Vaillant VU 186/3-5 (2005-2005) GC: 4104446
Vaillant VU 186/3-5 R1 (2005-2010) GC: 4104446
Vaillant VU 202/2-5 R1 (2002-2003) GC: 4104424
Vaillant VU 202/2-5 R2 (2003-2004) GC: 4104424
Vaillant VU 202/2-5 R3 (2004-2008) GC: 4104424
Vaillant VU 242/2-5 (2002-2003) GC: 4104425
Vaillant VU 242/2-5 R2 (2003-2004) GC: 4104425
Vaillant VU 242/2-5 R3 (2004-2008) GC: 4104425
Vaillant VU 246/3-5 (2005-2005) GC: 4104447
Vaillant VU 246/3-5 R1 (2005-2010) GC: 4104447
Vaillant VU 282/2-5 R1 (2002-2003) GC: 4704409
Vaillant VU 282/2-5 R2 (2003-2004) GC: 4704409
Vaillant VU 282/2-5 R3 (2004-2008) GC: 4704409
Vaillant VU 306/3-5 (2005-2005) GC: 4104448
Vaillant VU 306/3-5 R1 (2005-2010) GC: 4104448
Vaillant VU 362/2-5 (2002-2004) GC: 4104432
Vaillant VU 362/2-5 R3 (2004-2008) GC: 4104432
Vaillant VU 376/3-5 R1 (2006-2010) GC: 4104449
Vaillant VUI 376/3-5 (2006-2010) GC: 4104449
Vaillant VUW 242/2-3 R1 (2002-2003) GC: 4704410
Vaillant VUW 242/2-3 R2 (2003-2004) GC: 4704410
Vaillant VUW 242/2-3 R3 (2004-2008) GC: 4704410
Vaillant VUW 242/2-5 R1 (2002-2003) GC: 4704404
Vaillant VUW 242/2-5 R2 (2003-2004) GC: 4704404
Vaillant VUW 242/2-5 R3 (2004-2008) GC: 4704404
Vaillant VUW 246/3-3 R1 (2006-2010) GC: 4704436
Vaillant VUW 246/3-5 (2005-2005) GC: 4704431
Vaillant VUW 246/3-5 R1 (2005-2010) GC: 4704431
Vaillant VUW 282/2-3 R1 (2002-2003) GC: 4704410
Vaillant VUW 282/2-3 R2 (2003-2004) GC: 4704410
Vaillant VUW 282/2-3 R3 (2004-2008) GC: 4704410
Vaillant VUW 282/2-5 R1 (2002-2003) GC: 4704409
Vaillant VUW 282/2-5 R2 (2003-2004) GC: 4704409
Vaillant VUW 282/2-5 R3 (2004-2008) GC: 4704409
Vaillant VUW 286/3-3 (2005-2005) GC: 4704430
Vaillant VUW 286/3-3 R1 (2005-2010) GC: 4704430
Vaillant VUW 316/3-5 (2005-2005) GC: 4704432
Vaillant VUW 316/3-5 R1 (2005-2010) GC: 4704432
Vaillant VUW 326/4-E (2007-2010) GC: 4704437
Vaillant VUW 362/2-5 R3 (2002-2004) GC: 4104432
Vaillant VUW 362/2-5 R3 (2004-2008) GC: 4104432
Vaillant VUW 376/3-5 R1 (2006-2010) GC: 4704433
Vaillant VUW 386/4-E (2007-2010) GC: 4704438
Vaillant THERMOcompact 615 E (2002-2004) GC: 4104423
Vaillant THERMOcompact 615 E (2004-2008) GC: 4104423
Vaillant THERMOcompact 620 E (2003-2004) GC: 4104424
Vaillant THERMOcompact 620 E (2004-2008) GC: 4104424
Vaillant THERMOcompact 624 E (2003-2004) GC: 4104425
Vaillant THERMOcompact 624 E (2002-2003) GC: 4104425
Vaillant THERMOcompact 624 E (2004-2008) GC: 4104425
Vaillant THERMOcompact 628 E (2002-2003) GC: 4104426
Vaillant THERMOcompact 628 E (2003-2004) GC: 4104426
Vaillant THERMOcompact 628 E (2004-2008) GC: 4104426
Vaillant VU 126/5-5 (2012-CURR) GC: 4104460
Vaillant VU 156/5-5 (2012-CURR) GC: 4104461
Vaillant VU 186/5-5 (2012-CURR) GC: 4104462
Vaillant VU 246/5-5 (2012-CURR) GC: 4104463
Vaillant VU 306/5-5 (2012-CURR) GC: 4104464
Vaillant VU 376/5-5 (2012-CURR) GC: 4104465
Vaillant ecoTEC PLUS 612 GC: 4104444
Vaillant ecoTEC PLUS 615 GC: 4104445
Vaillant ecoTEC PLUS 618 GC: 4104446
Vaillant ecoTEC PLUS 624 GC: 4104447
Vaillant ecoTEC PLUS 630 GC: 4104450
Vaillant ecoTEC PLUS 637 GC: 4104485
Vaillant VU 126/5-5 R1 (2012-CURR) GC: 4104460
Vaillant VU 156/5-5 R2 (2012-CURR) GC: 4104461
Vaillant VU 186/5-5 R3 (2012-CURR) GC: 4104462
Vaillant VU 246/5-5 R4 (2012-CURR) GC: 4104463
Vaillant VU 306/5-5 R5 (2012-CURR) GC: 4104464
Vaillant VU 376/5-5 R6 (2012-CURR) GC: 4169427
Vaillant ecoTEC PLUS 612 R1 GC: 4104444
Vaillant ecoTEC PLUS 615 R2 GC: 4104461
Vaillant ecoTEC PLUS 618 R3 GC: 4104462
Vaillant ecoTEC PLUS 624 R4 GC: 4104463
Vaillant ecoTEC PLUS 630 R5 GC: 4169425
Vaillant ecoTEC PLUS 637 R6 GC: 4169427
Vaillant VUW 246/5-3 (2012-CURR) GC: 4704444
Vaillant VUW 286/5-3 (2012-CURR) GC: 4704445
Vaillant ecoTEC PRO 24 GC: 4704444
Vaillant ecoTEC PRO 28 GC: 4704455
Vaillant VUW 246/5-3 R1 (2012-CURR) GC: 4704444
Vaillant VUW 286/5-3 R1 (2012-CURR) GC: 4704445
Vaillant ecoTEC PRO 24 R1 GC: 4704436
Vaillant ecoTEC PRO 28 R1 GC: 4704456
Vaillant VUW 246/5-5 (2012-CURR) GC: 4704440
Vaillant VUW 316/5-5 (2012-CURR) GC: 4704441
Vaillant VUW 376/5-5 (2012-CURR) GC: 4704442
Vaillant ecoTEC PLUS 824 GC: 4704440
Vaillant ecoTEC PLUS 831 GC: 4704432
Vaillant ecoTEC PLUS 837 GC: 4704442
Vaillant VUW 246/5-5 R1 (2012-CURR) GC: 4104463
Vaillant VUW 316/5-5 R1 (2012-CURR) GC: 4704441
Vaillant VUW 376/5-5 R1 (2012-CURR) GC: 4704442
Vaillant ecoTEC PLUS 824 R1 GC: 4704440
Vaillant ecoTEC PLUS 831 R1 GC: 4704432
Vaillant ecoTEC PLUS 837 R1 GC: 4704433
Vaillant VUI 376/5-5 (2012-CURR) GC: 4704442
Vaillant ecoTEC PLUS 937 GC: 4704443
Vaillant VUI 376/5-5 R1 (2012-CURR) GC: 4704443
Vaillant ecoTEC PLUS 937 R1 GC: 4704443
Number reviews: 2
Overal rating: 5
Review for VAILLANT 104521 AUTOMATIC AIR VENT by Gas Patrol
2nd February 2022
Very easy to replace the automatic air vent, it can be done in under five minutes. Seals first time, use a little silicone grease around the o ring
Review for VAILLANT 104521 AUTOMATIC AIR VENT by DAJ
26th June 2021
Seems weird writing a review for components like this, but I have used one recently and it seems to have been fine. I have an awkward pipe run with little access and needed a vent. Merchant gave me this and with his recommendation I used it.
Bled and sealed as it should. No issues so far so I am happy.
No questions
