Viessmann 18 Plate Heat Exchanger – Refurbished | Part No. 7841779

When a Viessmann Vitodens boiler begins delivering inconsistent hot water — lukewarm taps, pressure drops, or fluctuating temperatures — the plate heat exchanger is often the root cause. This compact but critical component manages heat transfer between your central heating circuit and domestic hot water supply, and a worn or scaled unit directly undermines both. The Viessmann 18 Plate Heat Exchanger (Part No. 7841779) is the refurbished direct replacement, restoring full hot water output and improving overall boiler efficiency.

Compatible with selected Viessmann Vitodens models including the 050 W, 100 W, 111 W, and 200 W, this 18-plate unit is professionally refurbished — cleaned, descaled, pressure-tested, and inspected to confirm reliable, consistent operation before dispatch.

Compatible Boiler Models

OEM Quality. Proven Performance. Backed by Warranty.

Every refurbished plate heat exchanger we supply is cleaned, pressure-tested, and performance-verified before dispatch. This 7841779 unit restores efficient heat transfer between circuits, resolving common Vitodens issues including reduced hot water flow and unstable temperature output. Supplied with a full 12-month warranty, it delivers dependable, cost-effective performance for homeowners and heating engineers alike.

Delivery & Returns

Orders placed before 1:00 PM are dispatched the same working day, with standard and next-day delivery options available at checkout. Returns are accepted within 30 days, provided the item is unused and in its original packaging.

Note: Please confirm that part number 7841779 matches your existing unit using your boiler model and serial number before ordering. Installation must be carried out by a Gas Safe registered engineer to ensure safety compliance and warranty validity.