{"product_id":"mcdonnell-miller-134700-model-51-mechanical-water-feeder","title":"McDonnell \u0026 Miller 134700 Model 51 Mechanical Water Feeder","description":"\u003cp\u003eMaintaining precise water levels in your steam boiler is critical for system longevity and efficiency, and the \u003cb\u003e134700 McDonnell \u0026amp; Miller 51\u003c\/b\u003e mechanical water feeder is engineered to handle this task with precision. This robust valve assembly automatically replenishes water levels to prevent low-water cut-off conditions, ensuring your hydronic system operates continuously without manual intervention. By integrating the \u003cb\u003e134700\u003c\/b\u003e into your setup, you protect your boiler investment from the stresses of thermal cycling and potential dry firing.\u003c\/p\u003e\u003cp\u003eThe mechanism functions through a highly responsive float-operated valve system that detects drops in boiler water levels. As the water level falls, the mechanical linkage opens the feed valve, allowing make-up water to enter the system until the required level is restored. This simple, reliable design minimizes electrical dependency, providing a fail-safe approach to boiler maintenance in residential and commercial applications.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eAutomated Level Control:\u003c\/b\u003e Maintains consistent water levels to prevent burner dry-firing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMechanical Reliability:\u003c\/b\u003e Float-operated valve design ensures operation even during power interruptions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHeavy-Duty Construction:\u003c\/b\u003e Built to withstand the harsh internal environment of steam boiler systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for low-pressure steam boilers in light commercial settings, multi-family housing, and residential hydronic heating installations where consistent water monitoring is required.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43125816983646,"sku":"134700","price":1412.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/134700_image_a99562f3-c27d-4a69-8e84-6610d300e10c.png?v=1786038446","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-134700-model-51-mechanical-water-feeder","provider":"National Boiler Supply","version":"1.0","type":"link"}