{"product_id":"20929-1","title":"Aquastat Well Clamp | Replaces Honeywell 121371AA | NBK-20929-1","description":"\u003ch2\u003e\u003cstrong\u003eNBK-20929-1 – Aquastat Well Clamp | Replaces Honeywell 121371AA\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eNBK-20929-1 Aquastat Well Clamp\u003c\/strong\u003e is engineered to firmly secure aquastat sensor bulbs inside immersion wells in outdoor wood boilers, hydronic heating systems, and water heaters. A loose sensor bulb means inaccurate temperature readings, erratic cycling, and wasted energy — the NBK-20929-1 eliminates that problem with a positive-locking clamp that holds the bulb in firm thermal contact with the well at all times.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive-Locking Clamp Design\u003c\/strong\u003e – Holds aquastat sensor bulbs tightly in place for accurate, stable temperature readings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Construction\u003c\/strong\u003e – Resists vibration and loosening under continuous heating system operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation\u003c\/strong\u003e – Simple clamp design fits common aquastat well sizes used in hydronic and boiler systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect OEM Replacement\u003c\/strong\u003e – Drop-in replacement for Honeywell 121371AA with no modifications required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad Compatibility\u003c\/strong\u003e – Works with most standard aquastat immersion wells 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-20929-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 20929-1-NBK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Secures aquastat sensor bulbs into immersion wells for stable temperature control\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eReplaces \/ Cross-Reference\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eHoneywell:\u003c\/strong\u003e 121371AA\u003c\/li\u003e\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\u003eResidential and commercial water heater installations\u003c\/li\u003e\n\u003cli\u003eAny system using aquastat immersion wells requiring secure sensor attachment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhy Choose the NBK-20929-1?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWhen an aquastat sensor bulb shifts or rattles loose inside its well, your heating system loses the accurate temperature feedback it needs to operate efficiently. The \u003cstrong\u003eNBK-20929-1\u003c\/strong\u003e restores that precision with a durable, vibration-resistant clamp that keeps the sensor locked in optimal thermal contact — a direct, cost-effective replacement for Honeywell 121371AA.\u003c\/p\u003e","brand":"NBK","offers":[{"title":"Default Title","offer_id":56929226785108,"sku":"SO-20929-1","price":6.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1067\/7698\/5940\/files\/20929-1-121371AA.webp?v=1787841424","url":"https:\/\/total-hearth.shop\/products\/20929-1","provider":"total-hearth.shop","version":"1.0","type":"link"}