{"product_id":"worcester-bosch-greenstar-4000-21kw-system-boiler-including-flue-15mm-scale-reducer","title":"Worcester Bosch Greenstar 4000 21kW System Boiler Including Flue \u0026 15mm Scale Reducer","description":"\u003cdiv class=\"product__description\"\u003e\n\u003cdiv class=\"product-description-extended\"\u003e\n\u003cdiv class=\"product__description\"\u003e\n\u003cdiv class=\"product-description-extended\"\u003e\n\u003cdiv class=\"product__description\"\u003e\n\u003cdiv class=\"product-description-extended\"\u003e\n\u003cp data-start=\"93\" data-end=\"797\" class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong data-start=\"97\" data-end=\"186\"\u003eWorcester Bosch Greenstar 4000 21kW System Boiler Including Flue \u0026amp; 15mm Scale Reducer\u003c\/strong\u003e is a premium heating package designed for modern homes with a sealed heating system and an unvented hot water cylinder. Supplied with a \u003cstrong data-start=\"323\" data-end=\"346\"\u003ehorizontal flue kit\u003c\/strong\u003e and a \u003cstrong data-start=\"353\" data-end=\"375\"\u003e15mm Scale Reducer\u003c\/strong\u003e, this complete solution delivers reliable central heating while helping to reduce limescale build-up in hard water areas, protecting the boiler and maintaining long-term efficiency. Combining Worcester Bosch's renowned engineering with quiet operation and smart control compatibility, the Greenstar 4000 is an ideal choice for homeowners seeking dependable, energy-efficient heating. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"799\" data-end=\"1172\"\u003eDesigned for small to medium-sized homes, the \u003cstrong data-start=\"845\" data-end=\"882\"\u003eGreenstar 4000 21kW System Boiler\u003c\/strong\u003e features a sleek contemporary design, intuitive full-colour display, and compatibility with Worcester Bosch EasyControl. Its compact dimensions allow for flexible installation while providing consistent heating performance and outstanding reliability. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"1174\" data-end=\"1177\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"1179\" data-end=\"1194\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"1196\" data-end=\"1802\"\u003e\n\u003cli data-section-id=\"1pgorhp\" data-start=\"1196\" data-end=\"1216\"\u003e21kW System Boiler\u003c\/li\u003e\n\u003cli data-section-id=\"mxek2d\" data-start=\"1217\" data-end=\"1251\"\u003eIncludes \u003cstrong data-start=\"1228\" data-end=\"1251\"\u003eHorizontal Flue Kit\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1sqr91l\" data-start=\"1252\" data-end=\"1285\"\u003eIncludes \u003cstrong data-start=\"1263\" data-end=\"1285\"\u003e15mm Scale Reducer\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"778pqs\" data-start=\"1286\" data-end=\"1314\"\u003e\n\u003cstrong data-start=\"1288\" data-end=\"1302\"\u003eFuel Type:\u003c\/strong\u003e Natural Gas\u003c\/li\u003e\n\u003cli data-section-id=\"zlkba\" data-start=\"1315\" data-end=\"1387\"\u003eDesigned for sealed heating systems with a separate hot water cylinder\u003c\/li\u003e\n\u003cli data-section-id=\"ufviff\" data-start=\"1388\" data-end=\"1417\"\u003eErP \u003cstrong data-start=\"1394\" data-end=\"1405\"\u003eA Rated\u003c\/strong\u003e for heating\u003c\/li\u003e\n\u003cli data-section-id=\"17y6d5e\" data-start=\"1418\" data-end=\"1460\"\u003eUp to \u003cstrong data-start=\"1426\" data-end=\"1460\"\u003e94% central heating efficiency\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1kwci12\" data-start=\"1461\" data-end=\"1483\"\u003eQuiet Mark certified\u003c\/li\u003e\n\u003cli data-section-id=\"m9nlx9\" data-start=\"1484\" data-end=\"1518\"\u003eContemporary full-colour display\u003c\/li\u003e\n\u003cli data-section-id=\"1p0shaf\" data-start=\"1519\" data-end=\"1547\"\u003e\n\u003cstrong data-start=\"1521\" data-end=\"1536\"\u003eEasyControl\u003c\/strong\u003e compatible\u003c\/li\u003e\n\u003cli data-section-id=\"gb5uwd\" data-start=\"1548\" data-end=\"1566\"\u003eSolar compatible\u003c\/li\u003e\n\u003cli data-section-id=\"6kzyd4\" data-start=\"1567\" data-end=\"1614\"\u003eWide modulation range for improved efficiency\u003c\/li\u003e\n\u003cli data-section-id=\"fxzaq2\" data-start=\"1615\" data-end=\"1644\"\u003eCompact wall-mounted design\u003c\/li\u003e\n\u003cli data-section-id=\"1lbwhmn\" data-start=\"1645\" data-end=\"1802\"\u003e\n\u003cstrong data-start=\"1647\" data-end=\"1688\"\u003eUp to 10-Year manufacturer's warranty\u003c\/strong\u003e (subject to installation, registration, and Worcester Bosch warranty terms) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1804\" data-end=\"1807\"\u003e\n\u003ch2 data-section-id=\"jqrqi2\" data-start=\"1809\" data-end=\"1844\"\u003eIdeal for Modern Heating Systems\u003c\/h2\u003e\n\u003cp data-start=\"1846\" data-end=\"2118\"\u003eThe \u003cstrong data-start=\"1850\" data-end=\"1903\"\u003eWorcester Bosch Greenstar 4000 21kW System Boiler\u003c\/strong\u003e is ideal for \u003cstrong data-start=\"1917\" data-end=\"1948\"\u003esmall to medium-sized homes\u003c\/strong\u003e with a sealed heating system and separate hot water cylinder. It provides reliable heating performance while delivering stored hot water efficiently throughout the home.\u003c\/p\u003e\n\u003cp data-start=\"2120\" data-end=\"2363\"\u003eThe included \u003cstrong data-start=\"2133\" data-end=\"2155\"\u003e15mm Scale Reducer\u003c\/strong\u003e helps minimise limescale formation, making this package particularly suitable for homes in hard water areas and helping to protect the boiler's heat exchanger over time. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"2365\" data-end=\"2368\"\u003e\n\u003ch2 data-section-id=\"rpdj3a\" data-start=\"2370\" data-end=\"2409\"\u003ePowerful Central Heating Performance\u003c\/h2\u003e\n\u003cp data-start=\"2411\" data-end=\"2781\"\u003eDelivering a \u003cstrong data-start=\"2424\" data-end=\"2455\"\u003e21kW central heating output\u003c\/strong\u003e, the Greenstar 4000 System Boiler provides consistent warmth while operating with excellent energy efficiency. Its advanced condensing technology and wide modulation range help reduce gas consumption, lower heating bills, and maintain comfortable indoor temperatures throughout the year. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"2783\" data-end=\"2786\"\u003e\n\u003ch2 data-section-id=\"1henl9l\" data-start=\"2788\" data-end=\"2818\"\u003eCompact Contemporary Design\u003c\/h2\u003e\n\u003cp data-start=\"2820\" data-end=\"3018\"\u003eDesigned with modern homes in mind, the Greenstar 4000 features a stylish appearance and a compact footprint that allows installation in kitchens, utility rooms, or cupboards where space is limited.\u003c\/p\u003e\n\u003ch3 data-section-id=\"bpec4l\" data-start=\"3020\" data-end=\"3034\"\u003eDimensions\u003c\/h3\u003e\n\u003cul data-start=\"3036\" data-end=\"3093\"\u003e\n\u003cli data-section-id=\"1qr0f6k\" data-start=\"3036\" data-end=\"3055\"\u003e\n\u003cstrong data-start=\"3038\" data-end=\"3049\"\u003eHeight:\u003c\/strong\u003e 724mm\u003c\/li\u003e\n\u003cli data-section-id=\"1ferdmo\" data-start=\"3056\" data-end=\"3074\"\u003e\n\u003cstrong data-start=\"3058\" data-end=\"3068\"\u003eWidth:\u003c\/strong\u003e 400mm\u003c\/li\u003e\n\u003cli data-section-id=\"p2e4lp\" data-start=\"3075\" data-end=\"3093\"\u003e\n\u003cstrong data-start=\"3077\" data-end=\"3087\"\u003eDepth:\u003c\/strong\u003e 310mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3095\" data-end=\"3286\"\u003eThe included \u003cstrong data-start=\"3108\" data-end=\"3127\"\u003ehorizontal flue\u003c\/strong\u003e and \u003cstrong data-start=\"3132\" data-end=\"3154\"\u003e15mm Scale Reducer\u003c\/strong\u003e provide a complete installation package while helping to ensure long-term system performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"3288\" data-end=\"3291\"\u003e\n\u003ch2 data-section-id=\"ex875a\" data-start=\"3293\" data-end=\"3322\"\u003eAdvanced Energy Efficiency\u003c\/h2\u003e\n\u003cp data-start=\"3324\" data-end=\"3508\"\u003eWith an \u003cstrong data-start=\"3332\" data-end=\"3341\"\u003eErP A\u003c\/strong\u003e rating and up to \u003cstrong data-start=\"3359\" data-end=\"3393\"\u003e94% central heating efficiency\u003c\/strong\u003e, the Greenstar 4000 uses advanced condensing technology to maximise heat recovery while reducing fuel consumption.\u003c\/p\u003e\n\u003cp data-start=\"3510\" data-end=\"3689\"\u003eIts wide modulation ratio automatically adjusts output to match heating demand, helping improve efficiency and reduce unnecessary energy use. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"3691\" data-end=\"3694\"\u003e\n\u003ch2 data-section-id=\"bvzj9p\" data-start=\"3696\" data-end=\"3734\"\u003eSmart Heating Control Compatibility\u003c\/h2\u003e\n\u003cp data-start=\"3736\" data-end=\"4059\"\u003eThe Greenstar 4000 is fully compatible with \u003cstrong data-start=\"3780\" data-end=\"3811\"\u003eWorcester Bosch EasyControl\u003c\/strong\u003e, allowing homeowners to manage heating schedules remotely using a smartphone or tablet. It is also compatible with \u003cstrong data-start=\"3927\" data-end=\"3952\"\u003esolar thermal systems\u003c\/strong\u003e, offering greater flexibility for future renewable heating upgrades. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"4061\" data-end=\"4064\"\u003e\n\u003ch2 data-section-id=\"19rweb4\" data-start=\"4066\" data-end=\"4108\"\u003eReliable Performance \u0026amp; Easy Maintenance\u003c\/h2\u003e\n\u003cp data-start=\"4110\" data-end=\"4327\"\u003eBuilt to Worcester Bosch's renowned quality standards, the Greenstar 4000 features a durable internal design, Quiet Mark certified operation, and a clear full-colour display for straightforward monitoring and control.\u003c\/p\u003e\n\u003cp data-start=\"4329\" data-end=\"4474\"\u003eIts installer-friendly layout and easy servicing access help simplify installation and ongoing maintenance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"4476\" data-end=\"4479\"\u003e\n\u003ch2 data-section-id=\"15okmn6\" data-start=\"4481\" data-end=\"4508\"\u003eWarranty \u0026amp; Peace of Mind\u003c\/h2\u003e\n\u003cp data-start=\"4510\" data-end=\"4860\"\u003eThe \u003cstrong data-start=\"4514\" data-end=\"4603\"\u003eWorcester Bosch Greenstar 4000 21kW System Boiler Including Flue \u0026amp; 15mm Scale Reducer\u003c\/strong\u003e includes \u003cstrong data-start=\"4613\" data-end=\"4656\"\u003eup to a 10-Year manufacturer's warranty\u003c\/strong\u003e when installed and registered in accordance with Worcester Bosch's qualifying warranty conditions, providing long-term confidence and dependable after-sales support. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"4862\" data-end=\"4865\"\u003e\n\u003ch2 data-section-id=\"a8v9tg\" data-start=\"4867\" data-end=\"4971\"\u003eWhy Choose the Worcester Bosch Greenstar 4000 21kW System Boiler Including Flue \u0026amp; 15mm Scale Reducer?\u003c\/h2\u003e\n\u003cul data-start=\"4973\" data-end=\"5332\"\u003e\n\u003cli data-section-id=\"lb8gtc\" data-start=\"4973\" data-end=\"5012\"\u003ePremium Worcester Bosch system boiler\u003c\/li\u003e\n\u003cli data-section-id=\"f3kq1c\" data-start=\"5013\" data-end=\"5038\"\u003e\u003cstrong data-start=\"5015\" data-end=\"5038\"\u003e21kW heating output\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"aj1sub\" data-start=\"5039\" data-end=\"5069\"\u003eIncludes \u003cstrong data-start=\"5050\" data-end=\"5069\"\u003eHorizontal Flue\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1sqr91l\" data-start=\"5070\" data-end=\"5103\"\u003eIncludes \u003cstrong data-start=\"5081\" data-end=\"5103\"\u003e15mm Scale Reducer\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1kwci12\" data-start=\"5104\" data-end=\"5126\"\u003eQuiet Mark certified\u003c\/li\u003e\n\u003cli data-section-id=\"17y6d5e\" data-start=\"5127\" data-end=\"5169\"\u003eUp to \u003cstrong data-start=\"5135\" data-end=\"5169\"\u003e94% central heating efficiency\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"50y3yf\" data-start=\"5170\" data-end=\"5194\"\u003eEasyControl compatible\u003c\/li\u003e\n\u003cli data-section-id=\"gb5uwd\" data-start=\"5195\" data-end=\"5213\"\u003eSolar compatible\u003c\/li\u003e\n\u003cli data-section-id=\"m9nlx9\" data-start=\"5214\" data-end=\"5248\"\u003eContemporary full-colour display\u003c\/li\u003e\n\u003cli data-section-id=\"qsglj3\" data-start=\"5249\" data-end=\"5332\"\u003e\u003cstrong data-start=\"5251\" data-end=\"5292\"\u003eUp to 10-Year manufacturer's warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mağazam","offers":[{"title":"Default Title","offer_id":49048252285083,"sku":null,"price":1302.35,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0773\/2091\/3051\/files\/4000-fron-facing-1_1.webp?v=1784640473","url":"https:\/\/boilerlines.co.uk\/products\/worcester-bosch-greenstar-4000-21kw-system-boiler-including-flue-15mm-scale-reducer","provider":"Boiler Lines","version":"1.0","type":"link"}