{"product_id":"weil-mclain-381-800-875-gas-steam-boiler-125-mbh","title":"Weil-mclain 381-800-875 Gas Steam Boiler 125 Mbh","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe WEIL-MCLAIN 381-800-875 is a cast iron residential gas steam boiler rated at 125 MBH AGA input, 78 MBH net IBR output, and 82% AFUE. It operates on natural gas with electronic intermittent ignition and is designed for floor-mount installation in residential heating systems. The heat exchanger is cast iron, built to handle both steam and hot water applications. A stainless steel, non-linting pilot burner and automatic vent configuration make this unit well-suited for straightforward service and replacement work. Licensed HVAC and plumbing professionals handle installation and commissioning on this class of boiler.\u003c\/p\u003e\u003cp\u003eThe 381-800-875 is configured as a residential package steam boiler for natural gas supply. It fits hydronic heating systems requiring reliable steam output with a floor-mounted cast iron boiler. The unit ships configured for natural gas with electronic intermittent ignition only. Optional left end section openings allow for future integration of a tankless heater with the appropriate heater cover plate and control. This boiler is manufactured in the USA and meets CSA, ASME H, AHRI, and DOE applicable standards.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCast iron heat exchanger with 10-year limited warranty coverage\u003c\/li\u003e\n\u003cli\u003e82% AFUE natural gas fired with 125 MBH AGA input rating\u003c\/li\u003e\n\u003cli\u003eElectronic intermittent ignition with stainless steel non-linting pilot burner\u003c\/li\u003e\n\u003cli\u003eAutomatic vent system using 6-inch vent connection\u003c\/li\u003e\n\u003cli\u003eASME 15 PSI relief valve included; pressure rated to 50 PSI\u003c\/li\u003e\n\u003cli\u003eOptional tankless heater section available via left end section openings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM residential floor-mount cast iron steam boiler replacement or new installation for natural gas hydronic heating systems meeting CSA, ASME H, AHRI, and DOE standards.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a licensed HVAC technician or plumber in accordance with local codes and the applicable IFGC and ASME requirements. Shut off the gas supply and disconnect electrical power before any service or replacement work. The 6-inch vent connection requires proper venting to outdoor combustion exhaust per local mechanical code. Do not modify the factory gas train or ignition wiring configuration without consulting the manufacturer installation documentation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoiler Type\u003c\/strong\u003e: Steam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type\u003c\/strong\u003e: Natural Gas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAGA Input Rating\u003c\/strong\u003e: 125 MBH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDOE Heating Capacity\u003c\/strong\u003e: 104 MBH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet IBR Rating\u003c\/strong\u003e: 78 MBH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAFUE Rating\u003c\/strong\u003e: 82%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Type\u003c\/strong\u003e: Electronic Intermittent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBurner Type\u003c\/strong\u003e: Stainless Steel Non-Linting Pilot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Exchanger Material\u003c\/strong\u003e: Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating\u003c\/strong\u003e: 50 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelief Valve\u003c\/strong\u003e: 15 psi ASME Relief Valve Supplied\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVenting Type\u003c\/strong\u003e: Automatic Vent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVent Size\u003c\/strong\u003e: 6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply Connection\u003c\/strong\u003e: 3 inches Threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReturn Connection\u003c\/strong\u003e: 2.5 inches Threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas Connection\u003c\/strong\u003e: 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Content\u003c\/strong\u003e: 9.8 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoiler Dimensions\u003c\/strong\u003e: 21.25 inches L x 27.625 inches W x 33.75 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type\u003c\/strong\u003e: Floor Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplicable Standards\u003c\/strong\u003e: CSA, ASME H, AHRI, DOE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 10 Year Limited (Heat Exchanger), 2 Year Limited (Other Parts)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e: USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: WEIL-MCLAIN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 381-800-875\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WEIL-MCLAIN","offers":[{"title":"Default Title","offer_id":51268968317234,"sku":"381-800-875","price":4999.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/308911636.jpg?v=1780711300","url":"https:\/\/voomisupply.com\/products\/weil-mclain-381-800-875-gas-steam-boiler-125-mbh","provider":"Voomi Supply","version":"1.0","type":"link"}