{"product_id":"vaillant-main-heat-exchanger-refurbished-0020135129","title":"Vaillant Main Heat Exchanger – Refurbished | Part No. 0020135129","description":"\u003cp\u003eThe main heat exchanger is the heart of any condensing boiler — the stainless steel assembly where combustion gases give up their heat energy to the primary water circuit before passing into the flue. On a Vaillant ecoTEC boiler, a deteriorating main heat exchanger typically causes progressively worsening efficiency, frequent high-limit thermostat trips, unusual flue temperatures, or — in the case of physical failure — visible signs of water contamination in the flue path or gas odour in the primary circuit. The \u003cstrong\u003eVaillant Main Heat Exchanger (Part No. 0020135129)\u003c\/strong\u003e is the correct OEM replacement for restoring full thermal output, condensing efficiency, and safe operation across the compatible ecoTEC range.\u003c\/p\u003e\n\n\u003cp\u003eThis is a professionally refurbished genuine Vaillant main heat exchanger. Each unit is fully inspected — the stainless steel exchanger body, condensate collector, flow and return connections, flue manifold, and all associated gaskets and seals are examined and replaced as required. The assembly is pressure-tested at working pressure to confirm leak-free integrity across all joints and connection points before dispatch. Refurbished to full OEM specification at a meaningful saving over the cost of a new Vaillant exchanger.\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 Plus 841\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e47-583-24\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 main heat exchanger we supply is pressure-tested and performance-verified before dispatch. This 0020135129 unit restores full primary heat transfer and condensing efficiency, resolves high-limit lockout faults caused by a degraded or partially blocked exchanger, and ensures complete separation between combustion gases and the water circuit. 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\u003e0020135129\u003c\/strong\u003e matches your existing heat exchanger before ordering. Main heat exchanger replacement 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":48001097531557,"sku":"MHX-5129-A-BC","price":64.99,"currency_code":"GBP","in_stock":true}],"url":"https:\/\/ephsuppliers.com\/products\/vaillant-main-heat-exchanger-refurbished-0020135129","provider":"Elite Plumbing \u0026 Heating Suppliers Ltd","version":"1.0","type":"link"}