{"product_id":"weil-mclain-511-405-142","title":"Weil McLain 511-405-142 Cartridge Circulator","description":"\u003cp\u003eThe \u003cstrong\u003eWeil McLain 511-405-142 Cartridge Circulator\u003c\/strong\u003e is a replacement \u003cstrong\u003ecartridge-style circulator\u003c\/strong\u003e \u003cstrong\u003epump\u003c\/strong\u003e for \u003cstrong\u003eWeil-McLain\u003c\/strong\u003e \u003cstrong\u003ehydronic boiler\u003c\/strong\u003e heating systems. The \u003cstrong\u003ecirculator\u003c\/strong\u003e is the \u003cstrong\u003epump\u003c\/strong\u003e that pushes hot water from the \u003cstrong\u003eboiler\u003c\/strong\u003e out through the \u003cstrong\u003ebaseboard\u003c\/strong\u003e, \u003cstrong\u003eradiators\u003c\/strong\u003e or \u003cstrong\u003eradiant loops\u003c\/strong\u003e and carries it back to the \u003cstrong\u003eboiler\u003c\/strong\u003e, and when it quits you get the call every heating tech knows: the burner fires, the \u003cstrong\u003eboiler\u003c\/strong\u003e is hot and the house is cold. If you searched for \u003cstrong\u003e511-405-142\u003c\/strong\u003e, this is the \u003cstrong\u003eWeil McLain\u003c\/strong\u003e part number, listed as a \u003cstrong\u003eCartridge Circulator\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eA \u003cstrong\u003ecartridge circulator\u003c\/strong\u003e is built around a self-contained \u003cstrong\u003emotor\u003c\/strong\u003e and \u003cstrong\u003eimpeller\u003c\/strong\u003e assembly, so the parts that wear out are serviced as one unit instead of rebuilding the \u003cstrong\u003epump\u003c\/strong\u003e piece by piece. Before you condemn the \u003cstrong\u003epump\u003c\/strong\u003e, confirm the basics: line voltage at the \u003cstrong\u003ecirculator\u003c\/strong\u003e, a real call for heat from the \u003cstrong\u003ethermostat\u003c\/strong\u003e or \u003cstrong\u003ezone control\u003c\/strong\u003e, no trapped air in the loop, and a shaft that spins freely. A \u003cstrong\u003ecirculator\u003c\/strong\u003e that hums but does not turn, runs loud, or weeps at the \u003cstrong\u003eflange\u003c\/strong\u003e is a replacement candidate. Match the model, \u003cstrong\u003eflange\u003c\/strong\u003e arrangement and electrical rating on the old \u003cstrong\u003epump\u003c\/strong\u003e label before you order, because this listing does not publish a model cross-reference.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWeil-McLain\u003c\/strong\u003e uses a family of numbers in the \u003cstrong\u003e511-405\u003c\/strong\u003e range, and we list several of them as separate products, including \u003cstrong\u003e511-405-143\u003c\/strong\u003e and \u003cstrong\u003e511-405-153\u003c\/strong\u003e. They are separate part numbers and should not be swapped by guesswork, so order by the exact number on your parts list. Send us the \u003cstrong\u003eboiler\u003c\/strong\u003e model and serial number and our team will confirm the part before it ships.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eExact Part Number:\u003c\/strong\u003e \u003cstrong\u003e511-405-142\u003c\/strong\u003e is a specific \u003cstrong\u003eWeil McLain\u003c\/strong\u003e \u003cstrong\u003ecirculator\u003c\/strong\u003e, so the number on your parts list is the number to order.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCartridge Design:\u003c\/strong\u003e The \u003cstrong\u003emotor\u003c\/strong\u003e and \u003cstrong\u003eimpeller\u003c\/strong\u003e are one serviceable \u003cstrong\u003ecartridge circulator\u003c\/strong\u003e assembly, which keeps the repair to a single part.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHeating Loop Workhorse:\u003c\/strong\u003e A working \u003cstrong\u003ecirculator\u003c\/strong\u003e is what moves \u003cstrong\u003eboiler\u003c\/strong\u003e water through the \u003cstrong\u003ebaseboard\u003c\/strong\u003e, radiator or radiant zones, so this part decides whether the house actually gets heat.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFamily Cross-Reference:\u003c\/strong\u003e Sits in the same \u003cstrong\u003e511-405\u003c\/strong\u003e numbering family as the \u003cstrong\u003e511-405-143\u003c\/strong\u003e and \u003cstrong\u003e511-405-153\u003c\/strong\u003e circulators, which makes related \u003cstrong\u003eWeil McLain\u003c\/strong\u003e pumps easy to find.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhat is the Weil McLain 511-405-142?\u003c\/strong\u003e It is a \u003cstrong\u003eCartridge Circulator\u003c\/strong\u003e from \u003cstrong\u003eWeil-McLain\u003c\/strong\u003e, the \u003cstrong\u003epump\u003c\/strong\u003e that circulates hot water through a \u003cstrong\u003ehydronic boiler\u003c\/strong\u003e heating system. Order it by the exact number \u003cstrong\u003e511-405-142\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWill the 511-405-142 fit my boiler?\u003c\/strong\u003e Check the model, \u003cstrong\u003eflange\u003c\/strong\u003e arrangement and electrical rating on your existing \u003cstrong\u003ecirculator\u003c\/strong\u003e label and compare them to the part. Send us your \u003cstrong\u003eboiler\u003c\/strong\u003e model and serial number and we will confirm the fit before you buy.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHow do I know the circulator is the problem?\u003c\/strong\u003e If the \u003cstrong\u003eboiler\u003c\/strong\u003e reaches temperature but the loop stays cold, check for power and a call for heat first, then for air in the system. A \u003cstrong\u003ecirculator\u003c\/strong\u003e that hums without turning, makes grinding noise or leaks at the \u003cstrong\u003eflange\u003c\/strong\u003e is usually the culprit.\u003c\/li\u003e\n\u003c\/ul\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":"Weil McLain","offers":[{"title":"Default Title","offer_id":67972740546738,"sku":"511-405-142","price":333.0,"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-511-405-142","provider":"GSIstore","version":"1.0","type":"link"}