{"product_id":"weil-mclain-381-359-366-cgi-8-cast-iron-hot-water-boiler-164000-btu-natural-gas-spark-ignition-with-taco-007-circulator-series-5","title":"Weil-mclain 381-359-366 CGI-8 Cast Iron Hot Water Boiler 164000 Btu Natural Gas Spark Ignition with Taco 007 Circulator Series 5","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Weil-McLain 381-359-366 is the CGI-8 Series 5 cast iron gas-fired hot water boiler built for residential and light commercial hydronic heating systems. It delivers 164,000 BTU of verified IBR-rated output from a 222,000 BTU input, achieving a steady 84% thermal efficiency. That balance of input and output makes it a reliable workhorse for forced hot water heating in larger homes, multi-family buildings, and light commercial spaces where consistent heat delivery is essential. The boiler runs on natural gas and uses spark ignition, eliminating the need for a standing pilot light and reducing ongoing gas consumption during standby periods. The 120-volt electrical connection integrates cleanly into standard residential and commercial electrical systems. Cast iron section construction is the defining feature of this boiler. Cast iron holds heat longer than steel, resists corrosion over decades of service, and handles the thermal cycling demands of hydronic heating without warping or degrading. The insulated steel jacket surrounding the sections reduces standby heat loss, keeping the boiler operating efficiently even in unconditioned mechanical rooms. This unit ships as a complete assembly with a Taco 007 circulator pump already included, saving installation time and ensuring component compatibility right out of the box. The Taco 007 is a proven wet-rotor circulator widely used in residential hydronic systems. Power vent configuration allows for flexible flue routing with a 3-inch vent connection, giving installers more placement options compared to natural draft designs. The water connection measures 1-1\/2 inches, the gas connection measures 3\/4 inches, and the pressure relief valve is factory-set at 30 psi. Physical dimensions are 25 inches wide, 23-1\/4 inches deep, and 28-3\/8 inches tall. The DOE heating capacity rating is 189,000 BTU. Weil-McLain backs the heat exchanger with a 20-year warranty and covers parts for 2 years. Installation must be performed by a licensed heating professional in accordance with all applicable codes and manufacturer guidelines.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e164,000 BTU IBR-rated output with 84% efficiency on natural gas for reliable hydronic heating\u003c\/li\u003e\n\u003cli\u003eCast iron section construction with insulated steel jacket for long service life and reduced standby heat loss\u003c\/li\u003e\n\u003cli\u003eIncludes Taco 007 circulator pump and features spark ignition with power vent configuration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Highlights\u003c\/h4\u003e\u003cp\u003eThe Weil-McLain CGI-8 Series 5 is a proven cast iron hot water boiler suited for demanding residential and light commercial hydronic heating applications. It combines high BTU output, durable construction, and a complete circulator package for efficient and straightforward installation.\u003c\/p\u003e\u003ch3\u003eProduct Information\u003c\/h3\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: 381-359-366\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type\u003c\/strong\u003e: Boiler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoiler Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type\u003c\/strong\u003e: Hydronic (Water)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Heating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type\u003c\/strong\u003e: Natural Gas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Type\u003c\/strong\u003e: Spark Ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVent Type\u003c\/strong\u003e: Power Vent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBTU Output\u003c\/strong\u003e: 164,000 BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBTU Input\u003c\/strong\u003e: 222,000 BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIBR Rating\u003c\/strong\u003e: 164,000 BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDOE Rating\u003c\/strong\u003e: 189,000 BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency\u003c\/strong\u003e: 84%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage\u003c\/strong\u003e: 120V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVent Size\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas Connection\u003c\/strong\u003e: 3\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Connection\u003c\/strong\u003e: 1-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Relief\u003c\/strong\u003e: 30 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDepth\u003c\/strong\u003e: 23-1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 28-3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: 20 Years (Heat Exchanger) \/ 2 Years (Parts)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WEIL-MCLAIN","offers":[{"title":"Default Title","offer_id":51121009492274,"sku":"381-359-366","price":6551.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304883417.jpg?v=1777745778","url":"https:\/\/voomisupply.com\/products\/weil-mclain-381-359-366-cgi-8-cast-iron-hot-water-boiler-164000-btu-natural-gas-spark-ignition-with-taco-007-circulator-series-5","provider":"Voomi Supply","version":"1.0","type":"link"}