{"product_id":"mcdonnell-miller-149400-67-mechanical-low-water-cut-off","title":"McDonnell \u0026 Miller 149400 67 Mechanical Low Water Cut Off","description":"\u003cp\u003eEnsure the longevity and safety of your steam boiler system with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 149400\u003c\/strong\u003e, a high-performance \u003cstrong\u003eModel 67\u003c\/strong\u003e mechanical low water cut-off. Designed to provide dependable protection against dry firing, this essential safety control monitors water levels and automatically shuts down the burner circuit if the level drops below a critical threshold.\u003c\/p\u003e\u003cp\u003eThis device utilizes a float-actuated mechanical design that is proven to withstand the rigorous demands of commercial and residential steam heating environments. The internal switch mechanism ensures reliable interruption of power, preventing costly boiler damage and maintaining optimal system performance through simple, gravity-fed operation.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBurner Safety:\u003c\/strong\u003e Reliable shut-off during low water events to prevent boiler dry-firing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Construction:\u003c\/strong\u003e Engineered for durability in high-pressure and high-temperature steam boiler applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Response:\u003c\/strong\u003e Mechanical float action provides an immediate signal to system controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Maintenance:\u003c\/strong\u003e Designed for straightforward inspection and component accessibility.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for steam boilers requiring mandatory low-water fuel cut-off protection, including retrofits, boiler room safety upgrades, and replacement of older mechanical float controls.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43125826945118,"sku":"149400","price":596.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/149400_image_b648317d-441c-4107-8a62-7df5893caf8d.png?v=1786039087","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-149400-67-mechanical-low-water-cut-off","provider":"National Boiler Supply","version":"1.0","type":"link"}