{"product_id":"20929k","title":"Aquastat Immersion Well 1\/2 Inch with Clamp | Replaces Honeywell 121371A | NBK-20929K","description":"\u003ch2\u003e\u003cstrong\u003eNBK-20929K – Aquastat Immersion Well 1\/2 Inch with Clamp | Replaces Honeywell 121371A\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eNBK-20929K Aquastat Well Assembly\u003c\/strong\u003e is a precision 1\/2 inch immersion well complete with a securing clamp, engineered to house aquastat sensor bulbs for accurate temperature measurement in outdoor wood boilers, hydronic heating systems, and hot water tanks. Proper thermal coupling between the sensor and the water means your aquastat controller reads true temperatures — keeping your system safe, efficient, and running exactly as designed.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2 Inch Immersion Well\u003c\/strong\u003e – Standard size fits most aquastat sensor bulbs for accurate, reliable temperature sensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClamp Included\u003c\/strong\u003e – Secures the sensor bulb firmly in place, eliminating movement that causes erratic readings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Resistant Construction\u003c\/strong\u003e – Built to withstand system pressure and moisture for long-term, dependable service\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect OEM Replacement\u003c\/strong\u003e – Drop-in replacement for Honeywell 121371A and Grainger 50PL45\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad Compatibility\u003c\/strong\u003e – Works with most standard aquastat controllers used in outdoor boiler and hydronic heating applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e NBK-20929K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 20929K-NBK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWell Size:\u003c\/strong\u003e 1\/2 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Immersion well and clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Outdoor wood boilers, hydronic heating, hot water tanks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eReplaces \/ Cross-Reference\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHoneywell:\u003c\/strong\u003e 121371A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrainger:\u003c\/strong\u003e 50PL45\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCommon Applications\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor wood boilers and biomass boilers\u003c\/li\u003e\n\u003cli\u003eHydronic baseboard and radiant floor heating systems\u003c\/li\u003e\n\u003cli\u003eHot water storage tanks using immersion aquastat controls\u003c\/li\u003e\n\u003cli\u003eAny system requiring stable, accurate aquastat temperature sensing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhy Choose the NBK-20929K?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA loose or poorly fitted aquastat well leads to inaccurate temperature readings and inefficient system cycling. The \u003cstrong\u003eNBK-20929K\u003c\/strong\u003e solves that with a snug-fitting 1\/2 inch well and a positive-locking clamp that holds the sensor bulb securely in thermal contact with the water. It's a straightforward, cost-effective replacement for Honeywell 121371A and Grainger 50PL45 that restores accurate control to your heating system.\u003c\/p\u003e","brand":"NBK","offers":[{"title":"Default Title","offer_id":56929226391892,"sku":"SO-20929K","price":19.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1067\/7698\/5940\/files\/20929K-121371A.webp?v=1787841422","url":"https:\/\/total-hearth.shop\/products\/20929k","provider":"total-hearth.shop","version":"1.0","type":"link"}