{"product_id":"worcester-greenstar-4000-21kw-system","title":"Worcester Greenstar 4000 21kW System","description":"\u003ch3\u003eWorcester Greenstar 4000 21kW System Boiler\u003c\/h3\u003e\n\nThe Worcester Greenstar 4000 21kW System Boiler is the direct upgrade of the Greenstar 21Ri, designed specifically for medium-sized homes with one or two bathrooms. Compact, wall-mounted, and modern in design, this system boiler combines high efficiency, quiet operation, and user-friendly controls to deliver reliable heating and hot water for your home.\n\n\u003ch3\u003eEfficient Heating and Hot Water\u003c\/h3\u003e\n\nWith a wide power range and ErP A-rating, the Greenstar 4000 21kW is engineered to reduce gas consumption, helping to lower your energy bills. It is designed for homes with a hot water storage cylinder, providing sufficient hot water even for multiple bathrooms, making it a practical solution for medium-sized households.\n\n\u003ch3\u003eModern Features for Easy Operation\u003c\/h3\u003e\n\nThis boiler features a full-colour text display for intuitive operation, ensuring all controls are simple to navigate. Its quiet design makes it one of Worcester Bosch’s most unobtrusive system boilers. For added convenience, it supports wireless connectivity with the Bosch EasyControl, allowing you to monitor and adjust your heating remotely. It is also compatible with Greenskies solar panels, promoting energy savings and eco-friendly living.\n\n\u003ch3\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\nHeat output: 21kW – ideal for medium-sized homes with one or two bathrooms\n\nErP A-rated efficiency – helps reduce fuel costs and carbon footprint\n\nQuiet operation – one of Worcester’s quietest system boilers\n\nWireless connectivity – compatible with Bosch EasyControl\n\nEasy-to-use full-colour display – intuitive interface for all settings\n\nSuitable for hot water storage cylinders – reliable hot water supply for multiple bathrooms\n\nGreenskies solar panel compatible – reduces energy usage and costs\n\nCompact wall-mounted design – dimensions: 724 x 400 x 310mm (HxWxD)\n\n7-year manufacturer guarantee – for peace of mind\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\nBrand: Worcester Bosch\n\nModel: Greenstar 4000 21kW System (7733600383)\n\nBoiler Type: System Boiler\n\nFuel Type: Natural Gas\n\nHeat Output: 21kW\n\nMounting: Wall\n\nDimensions (HxWxD): 724 x 400 x 310mm\n\nColour: White\n\nWeight: 30.6kg\n\nErP Rating: A\n\nEAN: 4057749856722\n\nProduct Code: PN183939\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003eIs this boiler suitable for medium-sized homes?\u003c\/h4\u003e Yes – with a 21kW output, it is ideal for **medium-sized homes with one or two bathrooms**. \u003ch4\u003eCan it work with solar panels?\u003c\/h4\u003e Yes – the Greenstar 4000 21kW is compatible with **Greenskies solar panels** for enhanced energy efficiency. \u003ch4\u003eHow long is the warranty?\u003c\/h4\u003e This boiler comes with a **7-year manufacturer’s guarantee** for long-lasting reliability.\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":51771450327382,"sku":"146800","price":1375.68,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/worcester-greenstar-4000-21kw-system-7635388.jpg?v=1772639413","url":"https:\/\/jjbuildingmaterials.co.uk\/products\/worcester-greenstar-4000-21kw-system","provider":"JJ Building Materials","version":"1.0","type":"link"}