{"product_id":"vaillant-wh280-low-loss-header-306725-dn80-pn6","title":"Vaillant WH280 Low Loss Header | 306725 | DN80 PN6","description":"\u003c!-- SEO Product Name: Vaillant WH280 Low Loss Header | 306725 | DN80 PN6 --\u003e\n\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; font-family: Arial, Helvetica, sans-serif; color: #1f2937; line-height: 1.6;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eVaillant WH280 Low Loss Header\u003c\/strong\u003e is a commercial hydraulic separator designed to maintain stable water flow through the boiler while supplying a consistent temperature to multiple downstream heating circuits. With a \u003cstrong\u003eDN80\/PN6\u003c\/strong\u003e connection, a maximum flow rate of \u003cstrong\u003e21.5 m³\/hr\u003c\/strong\u003e and a substantial \u003cstrong\u003e1390 mm\u003c\/strong\u003e height, it is suited to larger commercial heating installations where hydraulic separation and reliable circuit control are essential.\u003c\/p\u003e\n\u003cp\u003eBy creating a neutral point between the boiler and heating circuits, the \u003cstrong\u003eWH280\u003c\/strong\u003e helps prevent interaction between the boiler circulation pump and individual circuit pumps. This supports steadier operation, helps protect the heat generator and makes it easier to serve circuits with differing flow and temperature requirements, such as \u003cstrong\u003eradiators\u003c\/strong\u003e and \u003cstrong\u003eunderfloor heating\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0;\"\u003e\n\u003cdiv style=\"flex: 1 1 130px; min-width: 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 13px; color: #008377cf; font-weight: bold;\"\u003eConnection\u003c\/div\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: bold;\"\u003eDN80\/PN6\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; min-width: 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 13px; color: #008377cf; font-weight: bold;\"\u003eMax Flow Rate\u003c\/div\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: bold;\"\u003e21.5 m³\/hr\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; min-width: 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 13px; color: #008377cf; font-weight: bold;\"\u003eFlow Capacity\u003c\/div\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: bold;\"\u003e21,500 L\/hr\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; min-width: 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 13px; color: #008377cf; font-weight: bold;\"\u003ePressure Drop\u003c\/div\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: bold;\"\u003e3.80 mbar\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; min-width: 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 13px; color: #008377cf; font-weight: bold;\"\u003eHeight\u003c\/div\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: bold;\"\u003e1390 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; min-width: 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 13px; color: #008377cf; font-weight: bold;\"\u003eMPN\u003c\/div\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: bold;\"\u003e306725\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 5px solid #d93025; background: #fdecea; padding: 14px 16px; border-radius: 6px; margin: 20px 0;\"\u003e\n\u003cstrong style=\"color: #d93025;\"\u003eInstallation notice:\u003c\/strong\u003e Vaillant low loss headers are intended for \u003cstrong\u003enew, clean heating systems\u003c\/strong\u003e using correctly inhibited water. Installation must be carried out by a competent heating engineer in accordance with the manufacturer’s instructions and applicable UK regulations.\u003c\/div\u003e\n\u003cdiv style=\"border-left: 5px solid #b45309; background: #fff7ed; padding: 14px 16px; border-radius: 6px; margin: 20px 0;\"\u003e\n\u003cstrong style=\"color: #b45309;\"\u003eSystem compatibility:\u003c\/strong\u003e Confirm the required header size against the boiler output, system temperature spread and total heating circuit flow rate before ordering. The \u003cstrong\u003eWH280\u003c\/strong\u003e is a large capacity commercial header and may not be suitable for smaller domestic systems.\u003c\/div\u003e\n\u003cdiv style=\"border-left: 5px solid #008377CF; background: #f0faf8; padding: 14px 16px; border-radius: 6px; margin: 20px 0;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eInstaller benefit:\u003c\/strong\u003e The low loss header helps decouple the boiler from the heating distribution system, supporting stable boiler flow and reducing the risk of hydraulic interaction between multiple pumps.\u003c\/div\u003e\n\u003cp style=\"font-size: 20px; font-weight: bold; color: #008377cf; border-bottom: 2px solid #008377CF; padding-bottom: 6px; margin-top: 28px;\"\u003eKey Features\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 14px; margin-top: 16px;\"\u003e\n\u003cdiv style=\"flex: 1 1 270px; min-width: 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; margin-bottom: 6px;\"\u003eHydraulic Separation\u003c\/div\u003e\n\u003cp style=\"margin: 0;\"\u003eCreates a neutral point that separates the \u003cstrong\u003eboiler circuit\u003c\/strong\u003e from downstream \u003cstrong\u003eheating circuits\u003c\/strong\u003e, helping pumps operate independently.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; min-width: 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; margin-bottom: 6px;\"\u003eHigh Flow Capacity\u003c\/div\u003e\n\u003cp style=\"margin: 0;\"\u003eHandles up to \u003cstrong\u003e21.5 m³\/hr\u003c\/strong\u003e or \u003cstrong\u003e21,500 litres per hour\u003c\/strong\u003e, making it suitable for demanding commercial heating applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; min-width: 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; margin-bottom: 6px;\"\u003eConsistent Supply Temperature\u003c\/div\u003e\n\u003cp style=\"margin: 0;\"\u003eHelps deliver a constant temperature supply to multiple circuits downstream of the header connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; min-width: 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; margin-bottom: 6px;\"\u003eDN80\/PN6 Connections\u003c\/div\u003e\n\u003cp style=\"margin: 0;\"\u003eFeatures robust \u003cstrong\u003eDN80\/PN6\u003c\/strong\u003e connections for integration into commercial pipework and boiler systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; min-width: 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; margin-bottom: 6px;\"\u003eMulti Circuit Support\u003c\/div\u003e\n\u003cp style=\"margin: 0;\"\u003eWell suited to installations with circuits that have different flow rate or temperature requirements, including \u003cstrong\u003eunderfloor heating\u003c\/strong\u003e and radiator systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; min-width: 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 16px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #008377cf; margin-bottom: 6px;\"\u003eVaillant Commercial Accessory\u003c\/div\u003e\n\u003cp style=\"margin: 0;\"\u003eManufactured by \u003cstrong\u003eVaillant\u003c\/strong\u003e under model reference \u003cstrong\u003eWH280\u003c\/strong\u003e, with manufacturer part number \u003cstrong\u003e306725\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 20px; font-weight: bold; color: #008377cf; border-bottom: 2px solid #008377CF; padding-bottom: 6px; margin-top: 32px;\"\u003eTechnical Specifications\u003c\/p\u003e\n\u003cdiv style=\"border: 2px solid #008377CF; border-radius: 8px; overflow: hidden; margin-top: 16px;\"\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 10px 14px;\"\u003eGeneral\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eBrand\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eVaillant\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #f9fafb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eProduct type\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eLow loss header\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eModel\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eWH280\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #f9fafb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eManufacturer part number (MPN)\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e306725\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 10px 14px;\"\u003eHydraulic Performance\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eConnection size\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eDN80\/PN6\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #f9fafb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eMaximum flow rate\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e21.5 m³\/hr\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eMaximum flow rate\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e21,500 L\/hr\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #f9fafb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003ePressure drop\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e3.80 mbar\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 10px 14px;\"\u003eDimensions\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eHeight\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e1390 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #f9fafb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eWidth\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e160 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eDepth\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e160 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 10px 14px;\"\u003eApplication \u0026amp; Warranty\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eSuitable application\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eCommercial heating systems requiring hydraulic separation\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; border-bottom: 1px solid #e5e7eb; background: #f9fafb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eSystem requirement\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eNew, clean systems with correctly inhibited water\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px; font-weight: bold;\"\u003eWarranty\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e1 year, subject to the manufacturer’s terms and conditions\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 20px; font-weight: bold; color: #008377cf; border-bottom: 2px solid #008377CF; padding-bottom: 6px; margin-top: 32px;\"\u003eFrequently Asked Questions\u003c\/p\u003e\n\u003cdetails style=\"border: 1px solid #d1d5db; border-radius: 8px; margin-top: 14px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 12px 14px; cursor: pointer;\"\u003eWhat does a low loss header do?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eA \u003cstrong\u003elow loss header\u003c\/strong\u003e provides hydraulic separation between the boiler and the heating circuits. It helps maintain the correct flow through the boiler while allowing downstream circuits to receive a consistent water supply.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #d1d5db; border-radius: 8px; margin-top: 14px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 12px 14px; cursor: pointer;\"\u003eIs the Vaillant WH280 suitable for domestic boilers?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eThe \u003cstrong\u003eWH280\u003c\/strong\u003e is a large capacity commercial low loss header with a \u003cstrong\u003eDN80\/PN6\u003c\/strong\u003e connection and \u003cstrong\u003e21.5 m³\/hr\u003c\/strong\u003e maximum flow rate. It should only be selected where the system design and boiler output require this capacity.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #d1d5db; border-radius: 8px; margin-top: 14px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 12px 14px; cursor: pointer;\"\u003eCan it be used with underfloor heating and radiators?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eYes. A low loss header can support multiple downstream circuits with different flow and temperature requirements, including \u003cstrong\u003eunderfloor heating\u003c\/strong\u003e and \u003cstrong\u003eradiator circuits\u003c\/strong\u003e, provided the system has been correctly designed.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #d1d5db; border-radius: 8px; margin-top: 14px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 12px 14px; cursor: pointer;\"\u003eDoes the WH280 require electrical components?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eThe low loss header itself is a hydraulic component. System controls, pumps and any sensors must be selected and installed according to the boiler manufacturer’s instructions and the overall system design.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #d1d5db; border-radius: 8px; margin-top: 14px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 12px 14px; cursor: pointer;\"\u003eWhat water condition is required?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eVaillant low loss headers are intended for \u003cstrong\u003enew, clean systems\u003c\/strong\u003e with correctly inhibited water. The system should be flushed and treated in line with best practice and the manufacturer’s installation requirements.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #d1d5db; border-radius: 8px; margin-top: 14px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; font-weight: bold; padding: 12px 14px; cursor: pointer;\"\u003eWho should install this product?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eInstallation should be completed by a \u003cstrong\u003ecompetent heating engineer\u003c\/strong\u003e familiar with commercial heating systems, hydraulic separation and the relevant UK standards. Correct sizing, pipework design and commissioning are essential for reliable operation.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Vaillant","offers":[{"title":"Default Title","offer_id":67661808140678,"sku":"306725","price":1700.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/Vaillant_WH280_Low_Loss_Header.jpg?v=1792493748","url":"https:\/\/qualityheating.co.uk\/products\/vaillant-wh280-low-loss-header-306725-dn80-pn6","provider":"AIZO Quality Heating","version":"1.0","type":"link"}