{"product_id":"vaillant-wh40-2-low-loss-header-with-insulation-0020248932-70-kw","title":"Vaillant WH40\/2 Low Loss Header with Insulation | 0020248932 | 70 kW","description":"\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; color: #1f2937; font-family: Arial,Helvetica,sans-serif; line-height: 1.6;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eVaillant WH40\/2 Low Loss Header with Insulation\u003c\/strong\u003e is a compact, horizontally mounted hydraulic separator designed for \u003cstrong\u003eVaillant ecoTEC plus 48 kW and 64 kW\u003c\/strong\u003e commercial boilers. It helps maintain a consistent boiler flow rate, supports stable water temperatures across downstream heating circuits, and is supplied with \u003cstrong\u003eEPP insulation\u003c\/strong\u003e to reduce heat loss in the plant room. With a maximum system capacity of \u003cstrong\u003e70 kW net input\u003c\/strong\u003e, it is a practical choice for new, clean commercial heating installations where space is limited.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0;\"\u003e\n\u003cdiv style=\"flex: 1 1 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 22px; font-weight: bold; color: #008377cf;\"\u003e70 kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px;\"\u003eNet input at 20K\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 22px; font-weight: bold; color: #008377cf;\"\u003e40 kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px;\"\u003eAt 11K spread\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 22px; font-weight: bold; color: #008377cf;\"\u003e3.5 m³\/h\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px;\"\u003eMaximum flow rate\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 22px; font-weight: bold; color: #008377cf;\"\u003e1.4 mbar\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px;\"\u003ePressure drop\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 22px; font-weight: bold; color: #008377cf;\"\u003e1¼\"\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px;\"\u003eBSP female connection\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 130px; border: 2px solid #008377CF; border-radius: 8px; padding: 14px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 22px; font-weight: bold; color: #008377cf;\"\u003eEPP\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px;\"\u003eInsulation included\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 5px solid #b91c1c; background: #fef2f2; padding: 14px; border-radius: 6px; margin: 20px 0;\"\u003e\n\u003cstrong style=\"color: #b91c1c;\"\u003eImportant installation note:\u003c\/strong\u003e Vaillant low loss headers are suitable only for \u003cstrong\u003enew, clean systems up to 70 kW net input\u003c\/strong\u003e using correctly inhibited water. For systems where water cleanliness cannot be assured, a plate heat exchanger should be considered instead.\u003c\/div\u003e\n\u003cdiv style=\"border-left: 5px solid #d97706; background: #fffbeb; padding: 14px; border-radius: 6px; margin: 20px 0;\"\u003e\n\u003cstrong style=\"color: #b45309;\"\u003eCompatibility:\u003c\/strong\u003e The \u003cstrong\u003eWH40\/2\u003c\/strong\u003e is intended for use with \u003cstrong\u003eVaillant ecoTEC plus 48 kW and 64 kW\u003c\/strong\u003e boilers and can be mounted horizontally beneath the boiler. Always confirm system design, flow requirements and clearance requirements before ordering.\u003c\/div\u003e\n\u003cdiv style=\"border-left: 5px solid #008377CF; background: #f0fdfa; padding: 14px; border-radius: 6px; margin: 20px 0;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eInstaller tip:\u003c\/strong\u003e Vaillant recommends fitting a \u003cstrong\u003edirt filter in the return pipework\u003c\/strong\u003e between the low loss header and heating circuits to help prevent system debris from entering the boiler.\u003c\/div\u003e\n\u003cp style=\"font-size: 18px; font-weight: bold; color: #008377cf; margin: 28px 0 12px;\"\u003eKey Features\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 12px;\"\u003e\n\u003cdiv style=\"flex: 1 1 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 14px;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eHydraulic separation\u003c\/strong\u003e\n\u003cp\u003eHelps decouple the boiler circuit from heating circuit pumps, reducing unwanted interaction between flows.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 14px;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eConsistent boiler flow\u003c\/strong\u003e\n\u003cp\u003eSupports the correct water flow through the boiler for reliable operation across varying system demands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 14px;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eMultiple heating circuits\u003c\/strong\u003e\n\u003cp\u003eEnables a constant temperature supply to reach several heating circuits downstream of the header.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 14px;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eLow pressure loss\u003c\/strong\u003e\n\u003cp\u003eThe 1.4 mbar pressure drop helps meet system flow requirements with minimal hydraulic resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 14px;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eEPP insulation supplied\u003c\/strong\u003e\n\u003cp\u003eThe included insulation helps minimise heat loss and maintain more stable plant room temperatures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 270px; border: 1px solid #d1d5db; border-top: 4px solid #008377CF; border-radius: 8px; padding: 14px;\"\u003e\n\u003cstrong style=\"color: #008377cf;\"\u003eSpace saving layout\u003c\/strong\u003e\n\u003cp\u003eDesigned for horizontal installation under compatible Vaillant boilers, making it suitable for restricted plant rooms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 18px; font-weight: bold; color: #008377cf; margin: 28px 0 12px;\"\u003eTechnical Specifications\u003c\/p\u003e\n\u003cdiv style=\"border: 1px solid #008377CF; border-radius: 8px; overflow: hidden;\"\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; padding: 10px 14px; font-weight: bold;\"\u003eGeneral\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eVaillant\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #f9fafb; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eProduct type\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eHorizontal low loss header kit with insulation\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eManufacturer part number\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e0020248932\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #f9fafb; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eWH40\/2\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eColour\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eBlack\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; padding: 10px 14px; font-weight: bold;\"\u003ePerformance\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eMaximum system capacity\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e70 kW net input at 20K temperature spread\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #f9fafb; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eCapacity at 11K spread\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e40 kW\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eMaximum flow rate\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e3.5 m³\/h \/ 3,500 litres per hour\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #f9fafb; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003ePressure drop\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e1.4 mbar\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; padding: 10px 14px; font-weight: bold;\"\u003eConnections and dimensions\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eConnection\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e1¼ inch BSP female\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #f9fafb; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eWidth\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e114 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e342 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #f9fafb; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e200 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e260 mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #ffffff; padding: 10px 14px; font-weight: bold;\"\u003eCompatibility and application\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eCompatible boilers\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eVaillant ecoTEC plus 48 kW and 64 kW\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #f9fafb; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eMounting orientation\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eHorizontal, suitable for installation beneath the boiler\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; background: #ffffff; border-bottom: 1px solid #e5e7eb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eSystem requirement\u003c\/strong\u003e\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: #f9fafb;\"\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003e\u003cstrong\u003eIncluded insulation\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; padding: 10px 14px;\"\u003eEPP insulation supplied as standard\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 18px; font-weight: bold; color: #008377cf; margin: 28px 0 12px;\"\u003eFrequently Asked Questions\u003c\/p\u003e\n\u003cdetails style=\"border: 1px solid #008377CF; border-radius: 8px; margin-bottom: 10px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; padding: 12px 14px; font-weight: bold; cursor: pointer;\"\u003eWhich Vaillant boilers is the WH40\/2 compatible with?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eThe \u003cstrong\u003eVaillant WH40\/2\u003c\/strong\u003e is designed for use with \u003cstrong\u003eecoTEC plus 48 kW and 64 kW\u003c\/strong\u003e boilers. It is a compact, horizontal low loss header intended to fit beneath the boiler where the installation layout allows.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #008377CF; border-radius: 8px; margin-bottom: 10px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; padding: 12px 14px; font-weight: bold; cursor: pointer;\"\u003eWhat size heating system can it support?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eIt is rated for systems up to \u003cstrong\u003e70 kW net input\u003c\/strong\u003e at a \u003cstrong\u003e20K temperature spread\u003c\/strong\u003e. At an \u003cstrong\u003e11K spread\u003c\/strong\u003e, its stated capacity is \u003cstrong\u003e40 kW\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #008377CF; border-radius: 8px; margin-bottom: 10px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; padding: 12px 14px; font-weight: bold; cursor: pointer;\"\u003eWhy does a heating system need a low-loss header?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eA low loss header provides \u003cstrong\u003ehydraulic separation\u003c\/strong\u003e between the boiler and heating circuits. This helps maintain stable flow through the boiler while allowing downstream circuit pumps to operate independently.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #008377CF; border-radius: 8px; margin-bottom: 10px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; padding: 12px 14px; font-weight: bold; cursor: pointer;\"\u003eDoes the WH40\/2 include insulation?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eYes. The WH40\/2 is supplied with \u003cstrong\u003eEPP insulation\u003c\/strong\u003e as standard, helping to reduce heat loss from the header and improve plant room comfort.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #008377CF; border-radius: 8px; margin-bottom: 10px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; padding: 12px 14px; font-weight: bold; cursor: pointer;\"\u003eCan it be used on an existing heating system?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eVaillant states that its low loss headers are suitable only for \u003cstrong\u003enew, clean systems\u003c\/strong\u003e with correctly inhibited water. For existing systems where cleanliness cannot be guaranteed, a \u003cstrong\u003eplate heat exchanger\u003c\/strong\u003e may be the more appropriate solution.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #008377CF; border-radius: 8px; margin-bottom: 10px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #ffffff; padding: 12px 14px; font-weight: bold; cursor: pointer;\"\u003eIs additional system protection recommended?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px;\"\u003eYes. Vaillant recommends a \u003cstrong\u003edirt filter in the return pipework\u003c\/strong\u003e between the low loss header and the heating circuits to help prevent debris from reaching the boiler.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Vaillant","offers":[{"title":"Default Title","offer_id":67661780353414,"sku":"20248932","price":470.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/Vaillant_WH40_2_Low_Loss_Header_with_Insulation.jpg?v=1792493166","url":"https:\/\/qualityheating.co.uk\/products\/vaillant-wh40-2-low-loss-header-with-insulation-0020248932-70-kw","provider":"AIZO Quality Heating","version":"1.0","type":"link"}