{"product_id":"mcdonnell-miller-135900-51-s-2-mechanical-water-feeder","title":"McDonnell \u0026 Miller 135900 51-S-2 Mechanical Water Feeder","description":"\u003cp\u003eMaintaining proper boiler water levels is essential for safe system operation, and the \u003cstrong\u003eMcDonnell \u0026amp; Miller 51-S-2\u003c\/strong\u003e mechanical water feeder provides dependable, automatic regulation. This unit, identified by part number \u003cstrong\u003e135900\u003c\/strong\u003e, is engineered to handle the demands of medium-pressure commercial and industrial steam boilers, ensuring consistent performance by automatically supplying makeup water as needed.\u003c\/p\u003e\u003cp\u003eThe feeder utilizes a float-operated valve mechanism that responds precisely to water level fluctuations within the boiler. As the water level drops, the internal float assembly descends, opening the valve to introduce a fresh supply of water until the required operating level is restored, effectively preventing dry firing and potential vessel damage.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Regulation:\u003c\/strong\u003e Maintains consistent water levels without constant manual intervention.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Construction:\u003c\/strong\u003e Built with high-grade components to withstand consistent boiler room temperature and pressure cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable Operation:\u003c\/strong\u003e Mechanical float design offers longevity and reduced maintenance requirements compared to electronic alternatives.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Recommended for use in commercial steam boilers, medium-pressure heating systems, and industrial hydronic applications where automatic, float-controlled water replenishment is critical for equipment longevity.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43125817966686,"sku":"135900","price":1728.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/135900_image_9f4710ec-af4e-41e0-b00b-5eb42804f1f1.png?v=1786038544","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-135900-51-s-2-mechanical-water-feeder","provider":"National Boiler Supply","version":"1.0","type":"link"}