{"product_id":"vaillant-diverter-valve-refurbished-178978","title":"Vaillant Diverter Valve – Refurbished | Part No. 178978","description":"\u003cp\u003eThe diverter valve is one of the most commonly replaced components on Vaillant combi boilers, and for good reason — it is in constant operation every time the boiler switches between central heating and domestic hot water demand. Over time, the internal rubber seals degrade, the valve spindle can seize due to limescale or corrosion, and the actuator motor loses the torque needed to reliably move the valve between positions. When this happens, the boiler typically presents with no hot water, no heating, or erratic switching between modes. The \u003cstrong\u003eVaillant Diverter Valve (Part No. 178978)\u003c\/strong\u003e is the correct OEM replacement for restoring full combi boiler operation across the compatible ecoTEC range.\u003c\/p\u003e\n\n\u003cp\u003eThis is a professionally refurbished genuine Vaillant diverter valve. Each valve body is fully disassembled — all internal seals, O-rings, and the rubber diaphragm or spindle seal are inspected and replaced as required. The valve is then reassembled, pressure-tested for leak integrity, and function-cycled through multiple actuation sequences to verify smooth, positive switching in both directions before dispatch. You receive full OEM-spec performance and durability at a meaningful saving over a new replacement part.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatible Boiler Models\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003cth style=\"padding:8px;border:1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding:8px;border:1px solid #ddd;\"\u003eGC No.\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVaillant ecoTEC Plus 824\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVaillant ecoTEC Plus 831\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVaillant ecoTEC Plus 837\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVaillant ecoTEC Plus 838\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-23\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVaillant ecoTEC Pro 24\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVaillant ecoTEC Pro 28\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVaillant ecoTEC Pro 30\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-02\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOEM Quality. Proven Performance. Backed by Warranty.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEvery refurbished Vaillant diverter valve we supply is pressure-tested and cycle-verified before dispatch. This 178978 valve restores positive, reliable switching between CH and DHW modes on the ecoTEC Plus and Pro range, eliminating the stuck-valve, no-hot-water, and mode-switching faults caused by a deteriorated original. Supplied with a full \u003cstrong\u003e12-month warranty\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDelivery \u0026amp; Returns\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOrders placed before \u003cstrong\u003e1:00 PM (Mon–Fri)\u003c\/strong\u003e are dispatched the same working day, with standard (2–3 working days), next-day, and Saturday delivery options available at checkout. Returns are accepted within \u003cstrong\u003e30 days\u003c\/strong\u003e, provided the item is unused and in its original packaging.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Please confirm that part number \u003cstrong\u003e178978\u003c\/strong\u003e matches your existing valve before ordering. Installation must be carried out by a \u003cstrong\u003eGas Safe registered engineer\u003c\/strong\u003e to ensure safety compliance and warranty validity.\u003c\/p\u003e","brand":"Vaillant","offers":[{"title":"Refurbished","offer_id":48001086816421,"sku":"DIV-8978-A-BC","price":33.49,"currency_code":"GBP","in_stock":true}],"url":"https:\/\/ephsuppliers.com\/products\/vaillant-diverter-valve-refurbished-178978","provider":"Elite Plumbing \u0026 Heating Suppliers Ltd","version":"1.0","type":"link"}