Viessmann Vitodens 100 Compact Heat Exchanger – Refurbished | Part No. 7831342

Poor heat transfer, reduced hot water output, or ignition lockouts on a Viessmann Vitodens 100 are often traced back to a worn main heat exchanger. The Viessmann 100 Compact Heat Exchanger 7831342 (Refurbished) is the correct replacement for the 100-W WB1B Heat Only and Compact ranges from 13kW to 26kW, restoring efficient, reliable heat transfer.

This is a professionally refurbished genuine Viessmann component, tested before dispatch. Minor cosmetic marks may be present, consistent with removal from a working boiler. Supplied with a full 12-month warranty. Only a limited number of refurbished units are available for this part.

Compatible Viessmann Boiler Models

Refurbished. Tested. 12-Month Warranty.

Every refurbished 7831342 heat exchanger is tested to OEM standards, restoring efficient heat transfer across the 100-W WB1B Heat Only and Compact 13-26kW range. Supplied with a full 12-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 7831342 matches your existing heat exchanger, and check the GC number against your boiler's data plate, before ordering. Must be fitted by a Gas Safe registered engineer.

Product Reference