{"product_id":"mcdonnell-miller-127100-25-a-hd-water-feeder-head-assembly","title":"McDonnell \u0026 Miller 127100 25-A-HD Water Feeder Head Assembly","description":"\u003cp\u003eMaintain consistent boiler water levels with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 127100 25-A-HD\u003c\/strong\u003e head assembly, engineered to ensure optimal performance of your automated water feeder system. This high-quality replacement component, identified by model \u003cstrong\u003e25-A-HD\u003c\/strong\u003e, serves as a direct functional restoration for units experiencing mechanical fatigue or internal component wear, restoring operational efficiency to your hydronic heating installation.\u003c\/p\u003e\u003cp\u003eThe head assembly utilizes a precision-engineered internal float-operated valve mechanism to detect water level fluctuations within the chamber. As the boiler water drops, the float action activates the assembly to replenish the system, providing a robust and reliable shut-off sequence that prevents dry-firing and maintains proper heat exchange efficiency throughout the hydronic loop.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Control:\u003c\/strong\u003e Maintains accurate water levels to prevent low-water boiler cut-off scenarios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless Integration:\u003c\/strong\u003e Designed for exact compatibility with 25-series water feeders for rapid field installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built to withstand the thermal and pressure stresses characteristic of steam and hydronic boiler environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Primarily utilized in commercial and industrial steam heating systems to automate make-up water requirements, ensuring continuous safe operation of heavy-duty boiler vessels.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43124884406366,"sku":"127100","price":1274.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/127100_image_c3ea0c04-ed33-46c6-9edf-0391e0985fe2.png?v=1786035432","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-127100-25-a-hd-water-feeder-head-assembly","provider":"National Boiler Supply","version":"1.0","type":"link"}