Viessmann Vitodens 100 WB1A Gas Valve VK4115V – Refurbished | Part No. 7823840

Ignition failure, unstable flame, or boiler lockout in a Viessmann Vitodens 100 WB1A boiler are commonly linked to a failing gas valve. This critical component regulates gas flow to the burner — when it deteriorates, safe and consistent combustion can no longer be maintained. The Viessmann Vitodens 100 WB1A Gas Valve VK4115V (Part No. 7823840) is the pre-owned direct replacement for the WB1A Heat Only, Combi, and System boiler range, restoring precise gas regulation and reliable heating performance.

This pre-owned unit is sourced from a functioning boiler and quality-checked by our experienced engineering team before dispatch. Minor cosmetic marks may be present, but all functional performance is confirmed. Supplied with a full 6-month warranty.

Compatible Boiler Models

Quality-Checked. Reliable. 6-Month Warranty.

Every pre-owned Viessmann gas valve we supply is quality-checked by our experienced engineering team, confirming correct gas regulation and safe combustion performance before dispatch. Supplied with a full 6-month warranty.

Delivery & Returns

Orders placed before 1:00 PM (Mon–Fri) are dispatched the same working day. Standard and next-day delivery available at checkout. Returns accepted within 30 days in original unused condition.

Note: Please confirm that part number 7823840 matches your existing gas valve and check your boiler's serial and GC number before ordering. Installation must be carried out by a Gas Safe registered engineer to ensure safety compliance and warranty validity.