Vaillant Automatic Air Vent 104521
Vaillant

Vaillant Automatic Air Vent 104521

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  • 1 Year WARRANTY
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  • Product SKU: D00065-02
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£4.16 (inc £4.99)
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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 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

We have a 14-day return policy, which means you have 14 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.This may result in some fee cuts.

The shipping fee for the returned products is our customers responsibility. Also, the shipping fee for the first shipment will be calculated and taken from the buyer. This value comes from the shipping value it cost to send your initial order.

To start a return, you can contact us at support@aspares.co.uk If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at support@aspares.co.uk


Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.


Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants), custom products (such as special orders or personalised items), and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.

Unfortunately, we cannot accept returns on sale items or gift cards.


Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.


Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.