{"product_id":"worcester-greenstar-4000-12kw-system-boiler","title":"Worcester Greenstar 4000 12KW System Boiler","description":"\u003ch3\u003eWorcester Greenstar 4000 12kW System Boiler\u003c\/h3\u003e\n\nThe Worcester Greenstar 4000 12kW System Boiler is an efficient and dependable option for homes that rely on a stored hot water cylinder. Designed with versatility in mind, it’s ideal for small to medium-sized properties that want consistent heating performance and reliable hot water delivery throughout the day.\n\nIts compact and lightweight build makes installation straightforward, even in tighter spaces. The boiler comes with a built-in pump and expansion vessel to simplify the setup, and it’s compatible with a wide selection of optional controls, giving homeowners the freedom to tailor their heating system for better comfort and improved energy savings.\n\nWhether you're upgrading an older boiler or installing a new system, the Greenstar 4000 offers dependable performance with modern efficiency.\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\nCompact, space-saving design\n\nBuilt-in pump and expansion vessel\n\nOptional plug-in diverter valve\n\nWide range of compatible controls for enhanced efficiency\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\nManufacturer: Worcester Bosch\nModel: 4000\nMPN: 7733600377\nSKU: 79140\nGTIN: 4057749856661\n\nPerformance:\n\nCH Output: 12kW\n\nCH Output (BTU): 40,000\n\nErP Heating Rating: A Rated\n\nDimensions:\n\nHeight: 724mm\n\nWidth: 400mm\n\nDepth: 310mm\n\nWeight:\n\nGross: 33.2kg\n\nWarranty:\n\n7 Years (subject to manufacturer T\u0026amp;Cs)\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003eIs the 12kW output suitable for my home?\u003c\/h4\u003e The 12kW model is ideal for **small to medium-sized homes** with moderate heating requirements and a stored hot water cylinder. \u003ch4\u003eDoes this system boiler require a separate hot water tank?\u003c\/h4\u003e Yes. As a **system boiler**, it works alongside a hot water cylinder to deliver consistent hot water throughout the home. \u003ch4\u003eCan I use smart controls with this boiler?\u003c\/h4\u003e Definitely. The Greenstar 4000 range supports a **wide variety of optional smart and traditional controls**, allowing for greater comfort and 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":51955277660502,"sku":"146794","price":1173.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/worcester-greenstar-4000-12kw-system-boiler-8777444.jpg?v=1772638814","url":"https:\/\/jjbuildingmaterials.co.uk\/products\/worcester-greenstar-4000-12kw-system-boiler","provider":"JJ Building Materials","version":"1.0","type":"link"}