Original HTS Air Vent Compatible With Vaillant 104521

Original HTS Air Vent Compatible With Vaillant 104521

This high‑quality Original HTS Air Vent is a direct replacement compatible with Vaillant part number 104521. Designed to maintain safe and efficient boiler operation, it automatically releases trapped air from your system to prevent pressure issues, noise, and air‑lock faults.

Suitable for homeowners, landlords, and heating engineers, this reliable part is manufactured to OEM‑equivalent standards and fits a wide range of Vaillant boilers.

Key Features:

• Direct replacement for Vaillant 104521
• Ensures optimal system pressure and air removal
• High‑quality, durable construction
• Easy installation
• Fits a large range of Vaillant boiler models

Compatible With the Following Vaillant Boilers:

Ecofit Pure (System & Combi): 612, 615, 618, 625, 630, 825, 830, 835

Sustain Range: Sustain 825, Sustain 830, Sustain 835 Sustain 24, Sustain 28, Sustain 34

Ecotec Exclusive: 832, 835, 838, 843 (all 2007–2016 and 5‑7 series)

Ecotec Plus (System & Combi): System (VU): 612, 615, 618, 624, 630, 637 (all revisions R1–R6) Combi (VUW): 824, 825, 831, 832, 835, 837, 838, 937, 938 (all LPG/NG versions, all revisions)

Ecotec Pro: 22, 24, 28, 30 (all LPG/NG versions, all revisions)

Exclusive 627: VU 256/5‑7

Home Series: Home Combi 25‑A, 30‑A, 35‑A Home System 12‑A, 15‑A, 18‑A, 25‑A

Thermocompact: 615E, 620E, 624E, 628E, 637E (Revisions R1–R3)

Turbomax Plus: 824E, 828E, 837E (Revisions R1–R3)

Turbomax Pro: 24E, 28E (Revisions R1–R3)

Package Includes: 1 x Original HTS Air Vent (Vaillant compatible 104521)

Important Note: If you are unsure whether this part fits your boiler, contact us with your boiler model, GC number, or serial number and we can confirm compatibility.

Why Buy From Us:

• Fast UK dispatch
• Specialist in Vaillant and boiler spare parts
• High‑quality, reliable components at excellent value