Vaillant EcoTec TurboTec VUV Combi Boiler Hydraulic Group Seal Repair Kit (0020172447)

This high-quality hydraulic group overhaul kit solves at the source, and reliably, the complaints combi boiler service technicians face most often in winter: "the boiler pressure keeps dropping" or "water is dripping from under the appliance". Used to replace the seals that harden and wear over time at the 3-way valve (VUV) and hydraulic block connections of Vaillant EcoTec and TurboTec series appliances, it restores the system's original leak-tightness.

A Definitive Fix for Combi Boiler Water Leaks: 0020172447 Repair Kit

• Reference Code: 0020172447 (Repair kit matching the Vaillant spare parts catalog one-to-one).
• Compatible Models: Vaillant EcoTec, TurboTec and VUV ecoEURO series room-sealed and condensing combi boiler hydraulic groups.
• Comprehensive Package Contents: A complete kit that leaves no need to source extra seals; it consists of pressure-resistant O-rings, thick rubber seals, a sealing washer, a U-type retaining circlip (clip), a long connecting stud and 3 mounting screws.
• Long-Lasting Sealing: Thanks to its formulation resistant to high temperatures (heating flow line) and chemicals in the system water, it does not leak or weep for many years.

Vaillant 0020172447 Kit Contents and Installation Warnings in the Field

• After removing the hydraulic block and the old, flattened O-rings, always clean the scale and oxide deposits from the brass or composite plastic seats. Seats left rough will cause the new seal to leak when the system is filled or to be damaged during fitting.
• When seating the new seals, applying a thin layer of silicone grease (plumbing grease) lets the parts slide together and definitively prevents the seal from being pinched and cut during installation.
• After the repair, make sure the U-type circlip (clip) is fully and completely seated in its groove. When you fill the combi boiler and bring the system pressure to 1.5 - 2 bar, carry out your first leak test in a controlled way in case the circlip pops out.