{"product_id":"worcester-greenstar-4000-21kw-lpg-system-boiler","title":"Worcester Greenstar 4000 21KW LPG System Boiler","description":"\u003ch3\u003eWorcester Greenstar 4000 21kW LPG System Boiler\u003c\/h3\u003e\n\nThe Worcester Greenstar 4000 21kW LPG System Boiler is an excellent choice for medium to large-sized homes that rely on a stored hot water cylinder. Designed for flexibility and strong performance, it provides reliable heating while keeping running costs low. Its LPG compatibility also makes it ideal for properties that are not connected to the mains gas network.\n\nCompact and lightweight, this boiler is easy to install in a variety of locations, even where space is limited. It comes with a built-in pump and expansion vessel, helping installers achieve a neat, efficient setup. Homeowners can further personalise their system with a wide selection of optional controls, including smart thermostats for increased comfort and energy savings.\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\nLPG-compatible system boiler for off-grid homes\n\nCompact dimensions for easy installation\n\nBuilt-in pump and expansion vessel for a cleaner layout\n\nOptional plug-in diverter valve\n\nCompatible with a wide range of optional heating controls\n\n\u003ch3\u003eTechnical Information\u003c\/h3\u003e\n\nManufacturer: Worcester Bosch\nModel: 4000\nMPN: 7733600384\nSKU: 79147\nGTIN: 4057749856739\nProduct Type: LPG System Boiler\n\nPerformance:\n\nCH Output: 21kW\n\nCH Output (BTU): 71,000\n\nErP Heating Rating: A Rated for Heating\n\nDimensions:\n\nHeight: 724mm\n\nWidth: 400mm\n\nDepth: 310mm\n\nWeight:\n\nGross Weight: 33.2kg\n\nWarranty:\n\n7 Years (Subject to manufacturer T\u0026amp;Cs)\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003eIs the 21kW model suitable for larger homes?\u003c\/h4\u003e Yes. The 21kW output makes it a strong match for **medium to large homes**, especially those with several radiators and a stored hot water cylinder. \u003ch4\u003eDo I need a separate hot water tank with this boiler?\u003c\/h4\u003e You do. As a **system boiler**, it works alongside a hot water cylinder, although it doesn’t require a cold water tank like a traditional regular boiler. \u003ch4\u003eCan I use smart heating controls with this boiler?\u003c\/h4\u003e Yes — the Greenstar 4000 range is compatible with a variety of **optional and smart controls**, allowing remote scheduling and improved energy efficiency.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/boilers\"\u003eboilers\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Worcester","offers":[{"title":"Default Title","offer_id":51955278053718,"sku":"146801","price":1455.72,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/worcester-greenstar-4000-21kw-lpg-system-boiler-3594873.jpg?v=1772638814","url":"https:\/\/jjbuildingmaterials.co.uk\/products\/worcester-greenstar-4000-21kw-lpg-system-boiler","provider":"JJ Building Materials","version":"1.0","type":"link"}