{"product_id":"grant-vortex-pro-external-21kw-oil-combi-boiler-with-flue-vtxomcombi21","title":"Grant Vortex Pro External 21kW Oil Combi Boiler with Flue | ErP A Rated | VTXOMCOMBI21","description":"\u003ch2\u003eGrant Vortex Pro External 21kW Oil Combi Boiler with Flue – Floor Standing | ErP A Rated\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGrant Vortex Pro External Combi Boiler\u003c\/strong\u003e is the ideal solution for properties where internal space is at a premium. Designed specifically for external installation, this 21kW oil combi boiler delivers high condensing efficiency, excellent hot water performance, and a factory-fitted multi-directional flue  all within a premium powder-coated external casing built to withstand the UK climate.\u003c\/p\u003e\n\u003cp\u003eCombining Grant’s award-winning engineering with the latest \u003cstrong\u003elow NOx Riello burner technology\u003c\/strong\u003e, the Vortex Pro External Combi achieves an average \u003cstrong\u003eSEDBUK SAP 2009 rating of 89.50%\u003c\/strong\u003e, registered with the Energy Savings Trust. Supplied complete with a \u003cstrong\u003e24-litre expansion vessel\u003c\/strong\u003e and flue as standard, this boiler is designed with the installer in mind — reducing on-site assembly time and simplifying the installation process.\u003c\/p\u003e\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProperties with limited internal space requiring an external boiler installation\u003c\/li\u003e\n\u003cli\u003eOil combi boiler replacements providing both central heating and instant hot water\u003c\/li\u003e\n\u003cli\u003eDomestic installations requiring ErP A-rated condensing performance\u003c\/li\u003e\n\u003cli\u003eInstallations where a compact, all-in-one combi solution is preferred\u003c\/li\u003e\n\u003cli\u003eProperties seeking a quiet, low-emission oil boiler (51dB, NOx Class 2)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Choose the Grant Vortex Pro External Combi?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-Built External Casing\u003c\/strong\u003e – High-quality powder-coated finish with built-in front protection, engineered to withstand outdoor installation in all UK weather conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-Fitted Multi-Directional Flue Included\u003c\/strong\u003e – Flue supplied and pre-fitted as standard, saving installation time and reducing on-site complexity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow NOx Riello Burner\u003c\/strong\u003e – Latest Riello RDB burner technology with plug-and-socket connection to the control panel for fast, tool-free removal during servicing. NOx Class 2 for low-emission operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-Litre Expansion Vessel Supplied\u003c\/strong\u003e – Included as standard, further reducing installation time and additional parts costs on site.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstant Hot Water on Demand\u003c\/strong\u003e – 21kW DHW output with a flow rate of 15 l\/min at 35°C rise, providing strong hot water performance without the need for a separate cylinder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Boiler Thermostat\u003c\/strong\u003e – Precise temperature control for improved comfort and energy efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Condensate Trap\u003c\/strong\u003e – Factory-fitted internally but can be repositioned externally if required, providing installation flexibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExceptionally Quiet\u003c\/strong\u003e – 51dB noise level, suitable for external installation close to windows and living spaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSEDBUK SAP 2009 Rating 89.50%\u003c\/strong\u003e – Registered with the Energy Savings Trust; ErP A rated for outstanding energy performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTiered Warranty Up to 5 Years\u003c\/strong\u003e – 1-year standard; 2 years if registered within 30 days; extended to 5 years when installed by a registered G1 installer with a Grant or equivalent filter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Grant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRange:\u003c\/strong\u003e Vortex Pro\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e VTXOMCOMBI21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplier Part Number:\u003c\/strong\u003e VTXOMCOMBI21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoiler Type:\u003c\/strong\u003e Combi Boiler (Oil)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount Type:\u003c\/strong\u003e Floor Standing (External)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Output:\u003c\/strong\u003e 21 kW (70,000 BTU\/h)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCH Condensing Max Output:\u003c\/strong\u003e 21 kW\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDHW Output:\u003c\/strong\u003e 21 kW\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDHW Flow Rate at 35°C Rise:\u003c\/strong\u003e 15 l\/min\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBTU\/h Range:\u003c\/strong\u003e 60,001 to 80,000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy Efficiency Rating:\u003c\/strong\u003e A (ErP)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSEDBUK SAP 2009 Rating:\u003c\/strong\u003e 89.50% (registered with Energy Savings Trust)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNOx Class:\u003c\/strong\u003e Class 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise Level:\u003c\/strong\u003e 51 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 945mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 658mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 754mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay Type:\u003c\/strong\u003e Analogue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Vertical Flue:\u003c\/strong\u003e 12m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpansion Vessel:\u003c\/strong\u003e 24 litres (supplied as standard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondensate Trap:\u003c\/strong\u003e Internal factory-fitted (can be repositioned externally)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Boiler + Flue + 24L Expansion Vessel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 year standard; 2 years if registered within 30 days; up to 5 years with G1 installer and Grant\/equivalent filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Grant Vortex Pro External 21kW Oil Combi Boiler\u003c\/li\u003e\n\u003cli\u003eFactory-fitted multi-directional flue\u003c\/li\u003e\n\u003cli\u003e24-litre expansion vessel\u003c\/li\u003e\n\u003cli\u003eManufacturer’s installation and user documentation\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eNote: System filter sold separately. Extended warranty requires G1 installer registration and compatible filter.\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation \u0026amp; Compliance Notes\u003c\/h3\u003e\n\u003cp\u003eThe Grant Vortex Pro External Combi must be installed by a registered \u003cstrong\u003eOFTEC\u003c\/strong\u003e engineer in accordance with \u003cstrong\u003eBS 5410\u003c\/strong\u003e, current Building Regulations, and the manufacturer’s installation guidelines. External installation must comply with relevant planning and Building Regulations requirements. Oil storage and supply pipework must comply with the Control of Pollution (Oil Storage) Regulations.\u003c\/p\u003e\n\u003cp\u003eFor maximum warranty coverage, installation must be carried out by a \u003cstrong\u003eGrant G1 registered installer\u003c\/strong\u003e with a Grant or equivalent system filter fitted. Condensate discharge must comply with BS EN 14336 and the manufacturer’s guidelines. Always commission and test the system in accordance with OFTEC procedures prior to handover.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eFor trade pricing, bulk orders, or technical support, please contact our team directly.\u003c\/em\u003e\u003c\/p\u003e","brand":"Grant","offers":[{"title":"Default Title","offer_id":53598541939026,"sku":"VTXOMCOMBI21","price":3750.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0904\/3001\/3778\/files\/image_99e21fd9-e68a-46b7-b5d8-e1279a4373ff.png?v=1780060217","url":"https:\/\/www.tradeplumbing.co.uk\/products\/grant-vortex-pro-external-21kw-oil-combi-boiler-with-flue-vtxomcombi21","provider":"Tradeplumbing","version":"1.0","type":"link"}