Vaillant ecoTEC Plus 824 Diverter Valve – Refurbished | Part No. 178978

Heating working but no hot water — or hot water but no heating — in a Vaillant ecoTEC boiler almost always points to a failed diverter valve. The diverter valve is responsible for switching hydraulic flow between the central heating circuit and the domestic hot water heat exchanger. When it sticks or seizes, the boiler cannot serve both functions on demand. The Vaillant ecoTEC Plus 824 Diverter Valve (Part No. 178978) is the correct OEM-specification replacement for the ecoTEC Plus 824, 831, and 837 VUW series, as well as the ecoTEC Pro range, restoring accurate 2-way flow switching and full boiler functionality.

This is a professionally refurbished genuine Vaillant component. Each valve is stripped, cleaned, inspected, and function-tested against original manufacturer specifications before dispatch — providing reliable hydraulic control at a significantly lower cost than a new valve. Supplied with a full 12-month warranty.

Compatible Boiler Models

OEM Tested. Function-Verified. Backed by Warranty.

Every refurbished Vaillant diverter valve in our range is inspected and function-tested to original manufacturer standards before dispatch. This 178978 valve restores accurate hydraulic switching between CH and DHW circuits, eliminating single-mode faults across the ecoTEC Plus and Pro ranges. Supplied with a full 12-month warranty.

Delivery & Returns

Orders placed before 1:00 PM are dispatched the same working day. Returns accepted within 30 days in original condition.

Note: Confirm part number 178978 matches your existing valve before ordering. Installation must be carried out by a Gas Safe registered engineer.