{"product_id":"20930k","title":"Aquastat Immersion Well 3\/4 Inch with Clamp | Replaces Honeywell 121371B | NBK-20930K","description":"\u003ch2\u003e\u003cstrong\u003eNBK-20930K – Aquastat Immersion Well 3\/4 Inch with Clamp | Replaces Honeywell 121371B\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eNBK-20930K Aquastat Well Assembly\u003c\/strong\u003e is a precision 3\/4 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. Secure thermal contact 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\u003e3\/4 Inch Immersion Well\u003c\/strong\u003e – Larger standard size fits most 3\/4\" 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 temperature 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 121371B and Grainger 3XK90\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-20930K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 20930K-NBK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWell Size:\u003c\/strong\u003e 3\/4 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 121371B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrainger:\u003c\/strong\u003e 3XK90\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\u003eCommercial or residential hot water loops requiring 3\/4\" well sizing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhy Choose the NBK-20930K?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWhen your system requires a 3\/4 inch immersion well, the \u003cstrong\u003eNBK-20930K\u003c\/strong\u003e delivers the same reliable thermal coupling as the Honeywell 121371B and Grainger 3XK90 it replaces. The included positive-locking clamp holds the sensor bulb in firm contact with the water, ensuring accurate readings, efficient cycling, and long-term system protection.\u003c\/p\u003e","brand":"NBK","offers":[{"title":"Default Title","offer_id":56929226686804,"sku":"SO-20930K","price":19.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1067\/7698\/5940\/files\/20930K-121371B-scaled.jpg?v=1787841423","url":"https:\/\/total-hearth.shop\/products\/20930k","provider":"total-hearth.shop","version":"1.0","type":"link"}