{"product_id":"honeywell-vs8421d8034-millivolt-gas-valve-750mv-lp-38-npt-vent-free-fireplace-control","title":"Honeywell VS8421D8034 Millivolt Gas Valve 750mV LP 3\/8 NPT Vent-Free Fireplace Control","description":"\u003ch4\u003eDescription\u003c\/h4\u003e\n\u003cp\u003eThe Honeywell VS8421D8034 is a millivolt gas valve designed for controlling gas flow in vent-free fireplace and space heating systems. It operates with a 750 mV system and supports precise regulation of LP gas with adjustable pressure settings. This valve is used to ensure consistent ignition, flame stability, and safe gas supply management in heating applications.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eValves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVS8421D8034\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGas Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVS8421\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVent-free fireplace and space heating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFuel Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLP (Liquefied Petroleum Gas)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e750 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBody Pattern\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStraight-through\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInlet\/Outlet Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3\/8 in. NPT x 3\/8 in. NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePilot Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\/16-24 UNS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePressure Regulator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh\/Low Adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePressure Setpoint\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10.0 in. wc High \/ 4.9 in. wc Low\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0°F to 175°F (-18°C to 79°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 to 90 degrees orientation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAGA, CGA (File no. C2030022)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCapacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60,000 Btuh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About VS8421D8034\u003c\/h4\u003e\n\u003cp data-start=\"386\" data-end=\"1036\"\u003eThe VS8421D8034 is part of Honeywell’s VS8421 series, developed for millivolt-controlled gas systems in residential heating equipment. It features a straight-through body design with integrated pressure regulation for both high and low settings, allowing accurate control of gas flow. The valve is compatible with vent-free fireplaces and space heaters, supporting thermocouple-based safety systems and standard NPT connections for installation. It is typically used in LP gas applications where stable flame control, safety shutoff, and efficient combustion are required.\u003c\/p\u003e\n\u003cp data-start=\"1038\" data-end=\"1056\"\u003e\u003cstrong data-start=\"1038\" data-end=\"1054\"\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMillivolt operation: Uses 750 mV system for reliable control without external power.\u003c\/li\u003e\n\u003cli\u003eAdjustable pressure regulator: High\/low settings enable precise gas flow control.\u003c\/li\u003e\n\u003cli\u003eStraight-through body design: Supports efficient gas flow with minimal pressure drop.\u003c\/li\u003e\n\u003cli\u003eLP gas compatibility: Designed specifically for liquefied petroleum gas systems.\u003c\/li\u003e\n\u003cli\u003eThermocouple connection: Integrates with ODS safety systems for flame monitoring.\u003c\/li\u003e\n\u003cli\u003eStandard NPT connections: 3\/8 in. inlet and outlet for easy installation.\u003c\/li\u003e\n\u003cli\u003eWide mounting flexibility: Can be installed from 0 to 90 degrees in multiple orientations.\u003c\/li\u003e\n\u003cli\u003eCertified design: Meets AGA and CGA certification standards for safety compliance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe VS8421D8034 delivers the reliability and precision required for safe gas flow control in vent-free fireplace and heating system applications.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":49104771940608,"sku":"VS8421D8034","price":1836.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/VS8421-1.jpg?v=1785532576","url":"https:\/\/alotechparts.com\/products\/honeywell-vs8421d8034-millivolt-gas-valve-750mv-lp-38-npt-vent-free-fireplace-control","provider":"Alo Tech Solutions","version":"1.0","type":"link"}