{"product_id":"mcdonnell-miller-172806-150s-m-combo-low-water-cut-off-and-pump-controller","title":"McDonnell \u0026 Miller 172806 150S-M Combo Low Water Cut-Off and Pump Controller","description":"\u003cp\u003eMaintain consistent boiler water levels and prevent critical equipment failure with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 172806\u003c\/strong\u003e 150S-M combo unit. Designed for steam boilers, this versatile assembly serves as both a primary low water cut-off and an automatic pump controller, ensuring that feedwater is supplied precisely when needed to protect the pressure vessel. By integrating these two essential functions, the \u003cstrong\u003e150S-M\u003c\/strong\u003e provides a robust safety solution that helps minimize downtime and extends the service life of commercial heating systems.\u003c\/p\u003e\u003cp\u003eThe unit operates using a high-precision internal switch mechanism that monitors the boiler water line. When the water level drops below the designated set point, the integrated pump controller activates the feedwater pump; if the level continues to fall below the critical safety threshold, the low water cut-off function automatically interrupts burner operation to prevent dry firing and heat exchanger damage.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Function Safety:\u003c\/strong\u003e Provides integrated pump control and low water shut-off in a single, compact housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Construction:\u003c\/strong\u003e Engineered to withstand the rigors of high-pressure commercial steam boiler environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable Switching:\u003c\/strong\u003e Features precise mechanical control for consistent water level regulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Compliance:\u003c\/strong\u003e Helps facilities meet code requirements for mandatory boiler water level supervision.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for light-to-medium commercial steam boilers, industrial processing steam systems, and building heating applications requiring redundant water management controls.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43126063726686,"sku":"172806","price":1257.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/172806_image_b01e17ae-6546-4d25-815c-96338991ad94.png?v=1786046303","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-172806-150s-m-combo-low-water-cut-off-and-pump-controller","provider":"National Boiler Supply","version":"1.0","type":"link"}