{"product_id":"21189","title":"Aquastat Hi\/Lo Limit Controller | Replaces Honeywell L6006C1018\/U | NBK-21189","description":"\u003ch2\u003e\u003cstrong\u003eNBK-21189 – Aquastat Hi\/Lo Limit Controller | Replaces Honeywell L6006C1018\/U\u003c\/strong\u003e\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eNBK-21189 Aquastat Hi\/Lo Limit Controller\u003c\/strong\u003e is a precision temperature control device engineered for hydronic heating systems, outdoor wood boilers, and hot water heating applications. With dual high- and low-temperature setpoints, it automatically protects your system from overheating and maintains safe, efficient operation — giving you peace of mind season after season.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Hi\/Lo Setpoints\u003c\/strong\u003e – Independently adjustable high and low temperature thresholds for precise system control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Safety Shutoff\u003c\/strong\u003e – Cuts burner or circulator operation the moment temperature limits are exceeded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Differential\u003c\/strong\u003e – Fine-tune cycle characteristics to maximize system efficiency and reduce short-cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Compatibility\u003c\/strong\u003e – Suitable for outdoor wood boilers, hydronic baseboard, and radiant heating systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect OEM Replacement\u003c\/strong\u003e – Drop-in replacement for Honeywell L6006C1018\/U with no modifications required\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-21189\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 21189-NBK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Aquastat Hi\/Lo Limit Controller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Outdoor wood boilers, hydronic heating, hot water heating systems\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 L6006C1018\/U\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\u003eHot water storage tanks requiring dependable high\/low limit control\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhy Choose the NBK-21189?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWhen your heating system needs reliable temperature protection, the \u003cstrong\u003eNBK-21189\u003c\/strong\u003e delivers. Its dual-setpoint design and automatic shutoff safeguard your boiler and circulator from thermal damage, while the adjustable differential keeps your system running at peak efficiency. A trusted, cost-effective replacement for Honeywell L6006C1018\/U.\u003c\/p\u003e","brand":"NBK","offers":[{"title":"Default Title","offer_id":56929223246164,"sku":"SO-21189","price":259.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1067\/7698\/5940\/files\/21189-L6006C1018-U-scaled.jpg?v=1787841421","url":"https:\/\/total-hearth.shop\/products\/21189","provider":"total-hearth.shop","version":"1.0","type":"link"}