{"product_id":"vaillant-ecotec-exclusive-843-main-heat-exchanger-refurbished-0020233504","title":"Vaillant ecoTEC Exclusive 843 Main Heat Exchanger – Refurbished | Part No. 0020233504","description":"\u003cp\u003eThe main heat exchanger is a critical and high-value component in the Vaillant ecoTEC Exclusive 843, responsible for transferring heat from the burner to the central heating and hot water system. When it fails, heating output drops, efficiency suffers, and the boiler may lock out entirely. The \u003cstrong\u003eVaillant ecoTEC Exclusive 843 Main Heat Exchanger (Part No. 0020233504)\u003c\/strong\u003e is a professionally refurbished genuine Vaillant replacement that restores full performance to this premium large-output boiler.\u003c\/p\u003e\n\n\u003cp\u003eThis is a \u003cstrong\u003efully refurbished\u003c\/strong\u003e original Vaillant part, professionally cleaned, inspected, and tested for functionality before dispatch. It is specifically designed for the Vaillant ecoTEC Exclusive 843 VUW 436\/5-7 (H-GB) model. Only 1 unit remaining — order promptly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatible Boiler\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;\"\u003eVariant\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 Exclusive 843\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eVUW 436\/5-7 (H-GB)\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\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVaillant part number 0020233504 — direct OEM replacement for ecoTEC Exclusive 843 VUW 436\/5-7\u003c\/li\u003e\n\u003cli\u003eProfessionally refurbished: cleaned, inspected, and fully tested before dispatch\u003c\/li\u003e\n\u003cli\u003eRestores efficient heat transfer and resolves heating output failure\u003c\/li\u003e\n\u003cli\u003eFree next-day delivery available\u003c\/li\u003e\n\u003cli\u003eOnly 1 left in stock — limited availability\u003c\/li\u003e\n\u003cli\u003e12-month warranty included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Please confirm that part number \u003cstrong\u003e0020233504\u003c\/strong\u003e and model code \u003cstrong\u003eVUW 436\/5-7\u003c\/strong\u003e match your boiler before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDelivery \u0026amp; Returns\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOrders placed before \u003cstrong\u003e1:00 PM\u003c\/strong\u003e (Monday–Friday) are dispatched the same working day. Standard and next-day delivery options available at checkout. Next-day orders placed on Fridays arrive Monday — select Saturday delivery at checkout for weekend delivery. Returns accepted within \u003cstrong\u003e30 days\u003c\/strong\u003e if unused and in original packaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Installation must be carried out by a \u003cstrong\u003eGas Safe registered engineer\u003c\/strong\u003e.\u003c\/p\u003e","brand":"Vaillant","offers":[{"title":"Refurbished","offer_id":48002419556517,"sku":"Vail-MHE-0020233504","price":699.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0768\/1690\/8453\/files\/Vaillant-ecoTEC-Exclusive-843-Main-Heat-Exchanger-0020233504-VUW-scaled.png?v=1783862238","url":"https:\/\/ephsuppliers.com\/products\/vaillant-ecotec-exclusive-843-main-heat-exchanger-refurbished-0020233504","provider":"Elite Plumbing \u0026 Heating Suppliers Ltd","version":"1.0","type":"link"}