{"product_id":"mcdonnell-miller-149500-67-lqhu-mechanical-low-water-cut-off","title":"McDonnell \u0026 Miller 149500 67-LQHU Mechanical Low Water Cut-Off","description":"\u003cp\u003eEnsure consistent boiler protection with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 149500\u003c\/strong\u003e, a high-performance mechanical low water cut-off designed for steam boilers. The \u003cstrong\u003e67-LQHU\u003c\/strong\u003e model provides a reliable safety mechanism to prevent burner operation when water levels drop below the required threshold, effectively mitigating the risk of dry firing and overheating.\u003c\/p\u003e\u003cp\u003eThis device functions through a precision-engineered float assembly that moves in response to the boiler water level. When the float reaches a critically low point, it triggers a switch that breaks the burner circuit, providing an essential layer of safety for commercial and residential hydronic systems.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Protection:\u003c\/strong\u003e Prevents dry-firing conditions by automatically interrupting the burner circuit during low-water events.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Construction:\u003c\/strong\u003e Engineered with durable materials to withstand the demanding pressures and temperatures of steam heating environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable Operation:\u003c\/strong\u003e Mechanical design offers proven, consistent performance without the need for complex electronic sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for steam boilers in commercial, industrial, and residential heating applications requiring dependable, heavy-duty low water protection.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43125827010654,"sku":"149500","price":458.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/149500_image_a47e751d-812f-4596-9ccb-2baa09226d41.png?v=1786039116","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-149500-67-lqhu-mechanical-low-water-cut-off","provider":"National Boiler Supply","version":"1.0","type":"link"}