{"product_id":"mcdonnell-miller-126400-model-21-make-up-water-feeder","title":"McDonnell \u0026 Miller 126400 Model 21 Make-Up Water Feeder","description":"\u003cp\u003eMaintain consistent boiler water levels and prevent low-water damage with the reliable \u003cstrong\u003e126400\u003c\/strong\u003e McDonnell \u0026amp; Miller \u003cstrong\u003eModel 21\u003c\/strong\u003e make-up water feeder. This essential component is engineered to automatically replenish water supply in steam and hot water boilers, ensuring your hydronic system operates at optimal efficiency without the need for manual intervention.\u003c\/p\u003e\u003cp\u003eThe unit utilizes a precision-engineered float mechanism that monitors the fluid level within the boiler. When levels drop below the threshold, the valve assembly opens to introduce make-up water, closing automatically once the required set point is reached to prevent overfilling and potential pressure issues.\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 line levels for peak boiler efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Engineering:\u003c\/strong\u003e Designed for long-term durability in high-cycle hydronic environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless Integration:\u003c\/strong\u003e Engineered to provide reliable mechanical fluid control across diverse boiler configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Recommended for use in residential and commercial steam or hot water heating boilers where automatic, mechanical level control is required for system safety and consistent pressure management.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43124880441438,"sku":"126400","price":957.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/126400_image_88e95302-bb2f-4c01-9f57-0aa315388b90.png?v=1786035404","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-126400-model-21-make-up-water-feeder","provider":"National Boiler Supply","version":"1.0","type":"link"}