{"product_id":"weil-mclain-381-800-856","title":"Weil McLain 381-800-856 Base Box","description":"\u003cp\u003eThe \u003cstrong\u003eWeil McLain 381-800-856 Base Box\u003c\/strong\u003e is the factory replacement \u003cstrong\u003ebase box\u003c\/strong\u003e for \u003cstrong\u003eWeil-McLain EG series\u003c\/strong\u003e gas-fired cast iron boilers. On an \u003cstrong\u003eEG boiler\u003c\/strong\u003e the base is the insulated sheet-metal enclosure beneath the cast iron sections. It forms the \u003cstrong\u003eburner compartment\u003c\/strong\u003e, supports the section stack, and keeps the heat of the burners directed up into the sections instead of out into the boiler room. Weil-McLain's \u003cstrong\u003eEG parts list\u003c\/strong\u003e identifies the main pieces of the base as the \u003cstrong\u003efront base panel\u003c\/strong\u003e, the \u003cstrong\u003eback base panel\u003c\/strong\u003e, a \u003cstrong\u003efront base access panel with flame rollout switch bracket\u003c\/strong\u003e, the \u003cstrong\u003ebase side rail\u003c\/strong\u003e and the \u003cstrong\u003ebase insulation kit 510-811-660\u003c\/strong\u003e. The \u003cstrong\u003e381-800-856\u003c\/strong\u003e is the larger replacement base box for when the base itself is damaged, not one of those small panels.\u003c\/p\u003e\n\u003cp\u003eWeil-McLain numbers its \u003cstrong\u003eEG base box\u003c\/strong\u003e and \u003cstrong\u003ecollector hood\u003c\/strong\u003e kits in sequence by boiler size: the \u003cstrong\u003e381-800-853\u003c\/strong\u003e for the \u003cstrong\u003eEG-35\u003c\/strong\u003e, the \u003cstrong\u003e381-800-854\u003c\/strong\u003e for the \u003cstrong\u003eEG-40\u003c\/strong\u003e, the \u003cstrong\u003e381-800-855\u003c\/strong\u003e for the \u003cstrong\u003eEG-45\u003c\/strong\u003e, the \u003cstrong\u003e381-800-857\u003c\/strong\u003e for the \u003cstrong\u003eEG-55\u003c\/strong\u003e, the \u003cstrong\u003e381-800-858\u003c\/strong\u003e for the \u003cstrong\u003eEG-65\u003c\/strong\u003e and the \u003cstrong\u003e381-800-859\u003c\/strong\u003e for the \u003cstrong\u003eEG-75\u003c\/strong\u003e. The \u003cstrong\u003e381-800-856\u003c\/strong\u003e belongs to this same numbered run, between the \u003cstrong\u003eEG-45\u003c\/strong\u003e and \u003cstrong\u003eEG-55\u003c\/strong\u003e numbers. Box size scales with the boiler: the \u003cstrong\u003eEG-45\u003c\/strong\u003e kit measures about \u003cstrong\u003e24-1\/2 by 15 inches\u003c\/strong\u003e, the \u003cstrong\u003eEG-55\u003c\/strong\u003e kit about \u003cstrong\u003e27 by 20 inches\u003c\/strong\u003e, and the \u003cstrong\u003eEG-65\u003c\/strong\u003e and \u003cstrong\u003eEG-75\u003c\/strong\u003e kits about \u003cstrong\u003e35-1\/2 by 27 inches\u003c\/strong\u003e. That is why the correct number depends on the exact \u003cstrong\u003eEG model and series\u003c\/strong\u003e, and why you should \u003cstrong\u003econfirm the base box number against your boiler's model and serial number\u003c\/strong\u003e and Weil-McLain's parts list for that boiler before you order.\u003c\/p\u003e\n\u003cp\u003eBase box replacement is a major repair, and it is usually driven by one of four problems: \u003cstrong\u003ecorrosion\u003c\/strong\u003e of the base panels from chronic condensation or a leaking section or fitting above, \u003cstrong\u003ewarping or burn-through\u003c\/strong\u003e from flame rollout or overheating, \u003cstrong\u003ecrumbled or saturated base insulation\u003c\/strong\u003e, or a base that has \u003cstrong\u003elost its shape\u003c\/strong\u003e and no longer seats the sections squarely. Because the base surrounds the burners and carries the \u003cstrong\u003eflame rollout switch bracket\u003c\/strong\u003e, plan on disconnecting the gas train, burners and jacket components to reach it. While the base is open, inspect the \u003cstrong\u003eflame rollout switch\u003c\/strong\u003e, the \u003cstrong\u003eburner assembly\u003c\/strong\u003e and the \u003cstrong\u003ebase insulation\u003c\/strong\u003e, and correct whatever caused the damage so the new base is not destroyed the same way. Weil-McLain warns that these boilers contain \u003cstrong\u003eceramic fiber and fiberglass insulation\u003c\/strong\u003e, so follow the manufacturer's handling instructions and wear a \u003cstrong\u003erespirator, gloves and eye protection\u003c\/strong\u003e. After reassembly, \u003cstrong\u003eleak-test every gas connection\u003c\/strong\u003e, confirm a normal flame pattern and verify venting before putting the boiler back in service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Weil-McLain EG Series Base Box:\u003c\/strong\u003e The OEM \u003cstrong\u003e381-800-856\u003c\/strong\u003e base box, built to the same numbered run as the \u003cstrong\u003e381-800-855, 381-800-857, 381-800-858 and 381-800-859\u003c\/strong\u003e kits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRestores the Burner Compartment:\u003c\/strong\u003e Replaces a \u003cstrong\u003ecorroded, warped or fire-damaged base\u003c\/strong\u003e that can no longer hold insulation, support the sections or contain the burner area properly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupports Safe Operation:\u003c\/strong\u003e A sound base keeps the \u003cstrong\u003eflame rollout switch bracket\u003c\/strong\u003e, burner area and insulation where Weil-McLain designed them to be.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocumented Sibling Numbers:\u003c\/strong\u003e Every neighboring \u003cstrong\u003eEG base box\u003c\/strong\u003e number is named above, so you can compare against the number on your boiler's parts list.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhich EG boiler does the 381-800-856 fit?\u003c\/strong\u003e It belongs to Weil-McLain's \u003cstrong\u003eEG series base box\u003c\/strong\u003e numbering run, and the right number depends on the boiler's size and series. Confirm against your \u003cstrong\u003eEG model and serial number\u003c\/strong\u003e and the Weil-McLain parts list before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs it the same as the 381-800-855 or 381-800-857?\u003c\/strong\u003e No. Those are separate base box and collector hood kits for the \u003cstrong\u003eEG-45\u003c\/strong\u003e and \u003cstrong\u003eEG-55\u003c\/strong\u003e. Each number is sized to its own boiler.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre the base panels and insulation sold separately?\u003c\/strong\u003e Yes. Weil-McLain lists the \u003cstrong\u003efront base panel\u003c\/strong\u003e, \u003cstrong\u003eback base panel\u003c\/strong\u003e, \u003cstrong\u003ebase access panel\u003c\/strong\u003e, \u003cstrong\u003ebase side rail\u003c\/strong\u003e and \u003cstrong\u003ebase insulation kit 510-811-660\u003c\/strong\u003e as individual EG service parts, which is useful when only one component is damaged.\u003c\/li\u003e\n\u003c\/ul\u003e\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\n\u003ch2\u003e\n\u003cspan style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/span\u003e\u003cspan style=\"font-size: 10.0pt; font-family: 'Arial',sans-serif; color: red; background: white;\"\u003e\u003c\/span\u003e\n\u003c\/h2\u003e","brand":"Weil McLain","offers":[{"title":"Default Title","offer_id":67725030817970,"sku":"381-800-856","price":511.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/ac-parts-1000x1000_d8f6c0df-eeb5-4a7f-8ee2-4f92681ea310.webp?v=1755632728","url":"https:\/\/www.gsistore.com\/en-ca\/products\/weil-mclain-381-800-856","provider":"GSIstore","version":"1.0","type":"link"}