{"product_id":"main-combi-30-eco-30-eco-elite-boiler-expansion-vessel-5114692-with-prv-248056","title":"MAIN COMBI 30 ECO \u0026 30 ECO ELITE BOILER EXPANSION VESSEL 5114692 WITH PRV 248056","description":"\u003ch1\u003e\u003cspan\u003eMain Combi 30 Eco \u0026amp; 30 Eco Elite Boiler Expansion Vessel 5114692 with PRV 248056\u003c\/span\u003e\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMain Expansion Vessel 5114692 with Pressure Relief Valve (PRV) 248056\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a replacement component kit designed for use within selected Main heating systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe expansion vessel is an important part of a sealed heating system. It absorbs the increase in water volume that occurs as the system heats up, helping to maintain stable operating pressure. The pressure relief valve (PRV) works alongside the expansion vessel by releasing excess pressure if the system exceeds safe operating limits.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTogether, these components help protect the boiler and heating system from pressure-related issues and support reliable operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eTechnical Insight \u0026amp; Common Failure Symptoms\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe expansion vessel contains an internal diaphragm and air chamber that provides a cushion for pressure changes within the heating system. Over time, the vessel may lose its charge or the internal diaphragm may deteriorate, affecting pressure control.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe PRV is a safety component designed to discharge excess system pressure. If it operates repeatedly due to pressure problems, it may require replacement to ensure correct sealing and operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTypical symptoms linked to a faulty expansion vessel or PRV include:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eBoiler pressure rising excessively when heating is operating\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePressure relief valve leaking or discharging water\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFrequent need to repressurise the heating system\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBoiler pressure dropping after operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWater escaping from the PRV discharge pipe\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePressure-related boiler faults or lockouts\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eReplacing the expansion vessel and PRV together may help restore stable system pressure and reliable boiler operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eManufacturer Part Number (MPN): 5114692\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003ePressure Relief Valve (PRV): 248056\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis part is designed for selected models within the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMain range\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePlease strictly verify the manufacturer part numbers \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5114692\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e248056\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e against your boiler's technical manual, exploded parts diagram, or existing components before ordering to guarantee correct fitment.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eSafety Advice\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eBoiler parts involve gas, water, pressure, and heating system components. Installation and servicing must be carried out by a Gas Safe registered engineer in accordance with current regulations and manufacturer instructions.\u003c\/em\u003e\u003c\/p\u003e","brand":"National Boiler Spares","offers":[{"title":"Default Title","offer_id":44361403236455,"sku":"N8280","price":66.48,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0615\/0923\/8887\/files\/image371181042_de0b7e44-80c1-48de-8db0-fb8be688ec3e.jpg?v=1785937283","url":"https:\/\/nationalboilerspares.co.uk\/products\/main-combi-30-eco-30-eco-elite-boiler-expansion-vessel-5114692-with-prv-248056","provider":"National Boiler Spares","version":"1.0","type":"link"}