{"product_id":"viessmann-7839819","title":"Viessmann 7839819 Radial Fan","description":"\u003cp\u003eThe \u003cstrong\u003eViessmann 7839819 Radial Fan\u003c\/strong\u003e is a critical combustion component designed for high-capacity \u003cstrong\u003eVitodens 200-W B2HA\u003c\/strong\u003e series gas-fired condensing boilers, specifically the \u003cstrong\u003e399 and 530 MBH\u003c\/strong\u003e models. Also designated as the \u003cstrong\u003eNRG137 B2HA 399\/530\u003c\/strong\u003e, this high-performance blower utilizes axial air intake and radial discharge to ensure precise air-fuel premixing, which is vital for maintaining the efficiency of the \u003cstrong\u003eLambda Pro combustion management system\u003c\/strong\u003e. For contractors performing a \u003cstrong\u003eViessmann blower motor replacement\u003c\/strong\u003e, this OEM part provides the exact static pressure required to overcome heat exchanger resistance, ensuring stable heating output and low-emission operation.\u003c\/p\u003e\n\n\u003cp\u003eWhen troubleshooting \u003cstrong\u003eboiler fan noise\u003c\/strong\u003e or airflow errors, installing this \u003cstrong\u003eHVAC radial fan\u003c\/strong\u003e restores the system to factory specifications. This \u003cstrong\u003edirect drive blower\u003c\/strong\u003e is engineered for continuous duty in residential and commercial applications, featuring a compact housing for streamlined installation in wall-mounted units. Always verify the 16-digit boiler serial number to confirm compatibility with the \u003cstrong\u003eVitodens 200-W fan motor\u003c\/strong\u003e assembly before proceeding with site repairs.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits:\u003c\/strong\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOptimized Combustion:\u003c\/strong\u003e Precisely regulates the air-gas mixture for maximum AFUE efficiency.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOperational Stability:\u003c\/strong\u003e Engineered to provide consistent airflow under varying gas qualities.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuiet Performance:\u003c\/strong\u003e Advanced blade geometry reduces acoustic vibration during \u003cstrong\u003emodulating cylinder burner\u003c\/strong\u003e operation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOEM Reliability:\u003c\/strong\u003e Built with high-grade materials to withstand the thermal demands of high-output 530 MBH systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions:\u003c\/strong\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWill this fan fit the Vitodens 200-W B2HA 112\/150 models?\u003c\/strong\u003e While both use NRG137 series fans, the 7839819 is specifically optimized for the higher-input B2HA 399 and 530 models; always check the boiler data plate for compatibility.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhat are the signs of a failing radial fan?\u003c\/strong\u003e Combustion instability, \"Fan Fault\" error codes on the color display, or excessive vibration during the modulation ramp-up phases.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIs professional installation required?\u003c\/strong\u003e Yes, this component is part of the gas combustion path and must be installed by a licensed technician to ensure proper fuel-air calibration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Viessmann","offers":[{"title":"Default Title","offer_id":43504627220658,"sku":"7839819","price":1901.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_e9282885-f0bf-49b7-9475-f49a80e3e34a.png?v=1752266933","url":"https:\/\/www.gsistore.com\/en-ca\/products\/viessmann-7839819","provider":"GSIstore","version":"1.0","type":"link"}