Viessmann Vitodens 100 WB1C 30kW Combi Gas Valve – Pre-Owned | Part No. 7849854

When a Viessmann Vitodens 100 boiler experiences ignition faults, unstable combustion, pressure irregularities, or lockout errors, the gas valve is a primary suspect. The Viessmann 100 WB1C 30kW Combi Gas Valve (Part No. 7849854) is a tested pre-owned replacement that restores accurate gas flow regulation and stable burner performance, returning your Viessmann boiler to safe, efficient operation.

This is a pre-owned gas valve, inspected and tested by qualified engineers before dispatch to confirm safe working condition. It provides a direct like-for-like fit for Viessmann Vitodens 100 WB1C 30kW and 35kW Combi and System models, as well as Vitodens 100 WB1HA System ErP variants — fitting without modification.

Compatible Boiler Models

Key Features

• Viessmann part number 7849854 (GB-ND 055 E01-DG) — direct OEM replacement
• Pre-owned: inspected and tested for safe gas flow control and accurate pressure regulation
• Fits Vitodens 100 WB1C 30kW/35kW Combi & System, and WB1HA 30kW/35kW System ErP
• Resolves ignition faults, unstable flame, pressure irregularities, and boiler lockouts
• 6-month warranty included

Delivery & Returns

Orders placed before 1:00 PM are dispatched the same working day. Standard and next-day delivery options available at checkout. Returns accepted within 30 days if unused and in original packaging.

Important: Gas valve replacement must always be carried out by a Gas Safe registered engineer.