{"product_id":"worcester-greenstar-4000-18kw-system-boiler","title":"Worcester Greenstar 4000 18KW System Boiler","description":"\u003ch3\u003eWorcester Greenstar 4000 18kW System Boiler\u003c\/h3\u003e\n\nThe Worcester Greenstar 4000 18kW System Boiler is a reliable, energy-efficient choice for medium to large-sized homes, especially those using a stored hot water cylinder. Designed with modern households in mind, it offers excellent performance, quiet operation, and the flexibility to pair with a wide range of heating controls.\n\nIts compact and lightweight design makes installation straightforward, even in tighter spaces. With built-in components such as a pump and expansion vessel, it reduces installation time and creates a tidy, streamlined setup. Homeowners can also enhance comfort and efficiency by adding optional controls, including smart thermostats.\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\nCompact, space-saving boiler ideal for flexible installation\n\nBuilt-in pump and expansion vessel for a cleaner, faster setup\n\nCompatible with optional plug-in diverter valve\n\nWide choice of optional heating controls\n\nPerfect for homes using a stored hot water cylinder\n\n\u003ch3\u003eTechnical Information\u003c\/h3\u003e\n\nManufacturer: Worcester Bosch\nModel: 4000\nMPN: 7733600381\nSKU: 79144\nGTIN: 4057749856708\nProduct Type: Gas System Boiler\n\nPerformance:\n\nCH Output: 18kW\n\nCH Output (BTU): 61,000\n\nErP 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 (Manufacturer T\u0026amp;Cs apply)\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003eIs this boiler suitable for larger homes?\u003c\/h4\u003e Yes — the 18kW output makes it a strong fit for **medium to large homes**, especially properties with multiple radiators and a stored hot water cylinder. \u003ch4\u003eDo I need a hot water tank with this system boiler?\u003c\/h4\u003e Yes. As a **system boiler**, it works alongside a stored hot water cylinder, but it does not require a separate feed tank like a conventional boiler. \u003ch4\u003eCan I use smart controls with this model?\u003c\/h4\u003e Absolutely. The Greenstar 4000 range supports a variety of **optional and smart controls**, helping to improve comfort and boost 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":51955278020950,"sku":"146798","price":1290.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/worcester-greenstar-4000-18kw-system-boiler-4536825.jpg?v=1772638812","url":"https:\/\/jjbuildingmaterials.co.uk\/products\/worcester-greenstar-4000-18kw-system-boiler","provider":"JJ Building Materials","version":"1.0","type":"link"}