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Vaillant Automatic Air Vent (104521)
Keep your heating system running efficiently and protect its internal components with this high-quality Vaillant Automatic Air Vent. Designed to automatically release trapped air from the boiler's sealed circuit, this part prevents "air-locking," eliminates system noise, and protects the pump and heat exchanger from premature wear and corrosion.
Exact Replacement: Engineered to meet the precise specifications of Vaillant part number 104521.
System Performance: Ensures consistent heat distribution and stable pressure by removing trapped gases.
Automatic Maintenance: Features a reliable float mechanism that purges air continuously without the need for manual venting.
Durable Design: Built to withstand high temperatures and system pressure within Vaillant's high-performance boiler ranges.
Compatible Models:
Vaillant Ecofit Pure 612 System VU 126/6-3 (H-GB) — 41-694-03
Vaillant Ecofit Pure 615 System VU 156/6-3 (H-GB) — 41-694-04
Vaillant Ecofit Pure 618 System VU 186/6-3 (H-GB) — 41-694-05
Vaillant Ecofit Pure 625 System VU 256/6-3 (H-GB) — 41-694-06
Vaillant Ecofit Pure 630 System VU 306/6-3 (H-GB) — 41-694-07
Vaillant Ecofit Pure 825 Combi VUW 256/6-3 (H-GB) — 47-044-68
Vaillant Ecofit Pure 830 Combi VUW 306/6-3 (H-GB) — 47-044-74
Vaillant Ecofit Pure 835 Combi VUW 356/6-3 (H-GB) — 47-044-70
Vaillant Sustain 825 VUW 256/6-3 (H-GB) — 47-044-71
Vaillant Sustain 830 VUW 306/6-3 (H-GB) — 47-044-72
Vaillant Sustain 835 VUW 356/6-3 (H-GB) — 47-044-73
Vaillant Ecotec Exclusive 832 VUW 32/4 — 47-044-37
Vaillant Ecotec Exclusive 835 VUW 356/5-7 — 47-044-66
Vaillant Ecotec Exclusive 838 VUW 386/4 — 47-044-38
Vaillant Ecotec Exclusive 843 VUW 436/5-7 — 47-044-67
Vaillant Ecotec Plus 612 VU 126/3-5 — 41-044-44
Vaillant Ecotec Plus 612 VU 126/5-5 — 41-044-60
Vaillant Ecotec Plus 612 VU 126/5-5 A R4 — 41-044-78
Vaillant Ecotec Plus 612 VU 126/5-5 R6 — 41-694-20 R6
Vaillant Ecotec Plus 615 VU 156/3-5 — 41-044-45
Vaillant Ecotec Plus 615 VU 156/5-5 — 41-044-61
Vaillant Ecotec Plus 615 VU 156/5-5 A R4 — 41-044-79
Vaillant Ecotec Plus 615 VU 156/5-5 R6 — 41-694-21 R6
Vaillant Ecotec Plus 618 VU 186/3-5 — 41-044-46
Vaillant Ecotec Plus 618 VU 186/5-5 (NG) — 41-044-62
Vaillant Ecotec Plus 618 VU 186/5-5 (LPG) — 41-044-66
Vaillant Ecotec Plus 618 VU 186/5-5 A R4 (NG) — 41-044-80
Vaillant Ecotec Plus 618 VU 186/5-5 A R4 (LPG) — 41-044-81
Vaillant Ecotec Plus 618 VU 186/5-5 R6 (NG) — 41-694-22 R6
Vaillant Ecotec Plus 618 VU 186/5-5 R6 (LPG) — 41-694-23 R6
Vaillant Ecotec Plus 624 VU 246/3-5 — 41-044-47
Vaillant Ecotec Plus 624 VU 246/5-5 — 41-044-63
Vaillant Ecotec Plus 624 VU 246/5-5 A R4 — 41-044-82
Vaillant Ecotec Plus 624 VU 246/5-5 R6 — 41-694-24 R6
Vaillant Ecotec Plus 630 VU 306/3-5 — 41-044-48
Vaillant Ecotec Plus 630 VU 306/5-5 (NG) — 41-044-64
Vaillant Ecotec Plus 630 VU 306/5-5 (LPG) — 41-044-67
Vaillant Ecotec Plus 630 VU 306/5-5 A R4 (NG) — 41-044-83
Vaillant Ecotec Plus 630 VU 306/5-5 A R4 (LPG) — 41-044-84
Vaillant Ecotec Plus 630 VU 306/5-5 R6 (NG) — 41-694-25 R6
Vaillant Ecotec Plus 630 VU 306/5-5 R6 (LPG) — 41-694-26 R6
Vaillant Ecotec Plus 637 VU 376/3-5 R1 — 41-044-52
Vaillant Ecotec Plus 637 VU 376/5-5 — 41-044-65
Vaillant Ecotec Plus 637 VU 376/5-5 A R4 — 41-044-85
Vaillant Ecotec Plus 637 VU 386/5-5 R6 — 41-694-27 R6
Vaillant Ecotec Plus 824 VUW 246/3-5 — 47-044-31
Vaillant Ecotec Plus 824 VUW 246/5-5 — 47-044-40
Vaillant Ecotec Plus 825 VUW 196/5-5 R6 — 47-044-83 R6
Vaillant Ecotec Plus 825 VUW 256/5-5 R4 — 47-044-57
Vaillant Ecotec Plus 831 VUW 316/3-5 — 47-044-32
Vaillant Ecotec Plus 831 VUW 316/5-5 (NG) — 47-044-41
Vaillant Ecotec Plus 831 VUW 316/5-5 (LPG) — 47-044-46
Vaillant Ecotec Plus 832 VUW 246/5-5 R6 (NG) — 47-044-84 R6
Vaillant Ecotec Plus 832 VUW 246/5-5 R6 (LPG) — 47-044-85 R6
Vaillant Ecotec Plus 832 VUW 326/5-5 R4 — 47-044-58
Vaillant Ecotec Plus 835 VUW 306/5-5 R6 — 47-044-82 R6
Vaillant Ecotec Plus 835 VUW 356/5-5 R4 — 47-044-53
Vaillant Ecotec Plus 837 VUW 376/3-5 R1 — 47-044-33 R1
Vaillant Ecotec Plus 837 VUW 376/5-5 — 47-044-42
Vaillant Ecotec Plus 838 VUW 286/5-5 R6 — 47-044-86 R6
Vaillant Ecotec Plus 838 VUW 386/5-5 R4 — 47-044-60
Vaillant Ecotec Plus 937 VUI 376/3-5 — 47-044-39
Vaillant Ecotec Plus 937 VUI 376/5-5 — 47-044-43
Vaillant Ecotec Plus 938 VUI 286/5-5 R6 — 47-044-87 R6
Vaillant Ecotec Pro 24 VUW 246/3-3 R1 — 47-044-36
Vaillant Ecotec Pro 24 VUW 246/5-3 — 47-044-44
Vaillant Ecotec Pro 24 VUW 246/5-3 R6 — 47-044-88
Vaillant Ecotec Pro 28 VUW 286/3-3 R1 — 47-044-30
Vaillant Ecotec Pro 28 VUW 286/5-3 (NG) — 47-044-45
Vaillant Ecotec Pro 28 VUW 286/5-3 (LPG) — 47-044-47
Vaillant Ecotec Pro 28 VUW 286/5-3 R4 — 47-044-55
Vaillant Ecotec Pro 28 VUW 286/5-3 R6 — 47-044-89
Vaillant Ecotec Pro 30 VUW 306/5-3 R4 — 47-044-52
Vaillant Exclusive 627 VU 256/5-7 — 41-694-02
Vaillant Sustain 24 VUW 246/7-2 — 47-044-79
Vaillant Sustain 28 VUW 286/7-2 — 47-044-80
Vaillant Sustain 34 VUW 346/7-2 — 47-044-81
Vaillant Home Combi 25 -A — 47-044-62
Vaillant Home Combi 30 -A — 47-044-63
Vaillant Home Combi 35 -A — 47-044-64
Vaillant Home System 12 -A — 41-044-94
Vaillant Home System 15 -A — 41-044-95
Vaillant Home System 18 -A — 41-044-96
Vaillant Home System 25 -A — 41-044-97
Vaillant Thermocompact 615E VU 152/2-5 R1 — 41-044-23
Vaillant Thermocompact 620E VU 202/2-5 R1 — 41-044-24
Vaillant Thermocompact 624E VU 242/2-5 R1 — 41-044-25
Vaillant Thermocompact 628E VU 282/2-5 R1 — 41-044-26
Vaillant Thermocompact 637E VU 362/2-5 — 41-044-32
Vaillant Turbomax Plus 824E VUW 242/2-5 R1 — 47-044-04
Vaillant Turbomax Plus 828E VUW 282/2-5 R1 — 47-044-09
Vaillant Turbomax Plus 837E VUW 362/2-5 — 47-044-28
Vaillant Turbomax Pro 24E VUW 242/2-3 R1 — 47-044-10
Vaillant Turbomax Pro 28E VUW 282/2-3 R1 — 47-044-11
Additional Compatible Series:
Vaillant Ecotec Plus 612, 615, 618, 624, 630, 637 (Various Revisions)
Vaillant Ecotec Pro 22 VU 226/5-3 (Guernsey/Jersey Models)
Vaillant Ecotec Pro 28 VUW 286/5-3 R6 LPG (0010021838) — 47-044-90
Vaillant
D00065-02
