{"product_id":"mcdonnell-miller-140100-model-61-mechanical-low-water-cut-off","title":"McDonnell \u0026 Miller 140100 Model 61 Mechanical Low Water Cut-Off","description":"\u003cp\u003eEnsure the longevity and safety of your boiler system with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 140100\u003c\/strong\u003e mechanical low water cut-off. This essential safety device, model \u003cstrong\u003e61\u003c\/strong\u003e, is designed to monitor water levels accurately, automatically interrupting the burner circuit if levels drop below a safe operating threshold to prevent catastrophic dry-firing damage.\u003c\/p\u003e\u003cp\u003eThe unit utilizes a precision-engineered float mechanism that responds to fluctuating water levels within the boiler. When the water level decreases, the internal float drops, mechanically breaking the electrical contact to shut down the heating element or burner, providing an immediate and reliable fail-safe for residential and commercial hydronic installations.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Shutdown:\u003c\/strong\u003e Prevents dry-firing and boiler burnout during low-water events.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Mechanical Design:\u003c\/strong\u003e Proven float-activated technology for long-term operational reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Safety Compliance:\u003c\/strong\u003e Engineered to meet stringent industry standards for boiler control and safety management.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for steam and hot water boilers where reliable water level monitoring is required to maintain system integrity and prevent costly repairs.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43125823438942,"sku":"140100","price":648.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/140100_image_f0739cf1-3f46-4676-82b7-f562be3e887d.png?v=1786038929","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-140100-model-61-mechanical-low-water-cut-off","provider":"National Boiler Supply","version":"1.0","type":"link"}