Aquastat Hi/Lo Limit Controller

NBK-21048 – Aquastat Hi/Lo Limit Controller | Replaces Honeywell L6006A1145The NBK-21048 Aquastat Hi/Lo Limit Controller is a precision temperature control device engineered for outdoor wood boilers, hydronic heating systems, and hot water heating applications. With independently adjustable high- and low-temperature setpoints, it automatically protects your system from overheating and maintains safe, efficient operation — giving you reliable heat control season after season.Key FeaturesDual Hi/Lo Setpoints – Independently adjustable high and low temperature thresholds for precise hydronic system controlAutomatic Safety Shutoff – Cuts burner or circulator operation the moment temperature limits are exceededAdjustable Differential – Fine-tune cycle characteristics to reduce short-cycling and maximize system efficiencyVersatile Compatibility – Suitable for outdoor wood boilers, hydronic baseboard, radiant floor, and hot water tank applicationsDirect OEM Replacement – Drop-in replacement for Honeywell L6006A1145 with no modifications requiredSpecificationsSKU: NBK-21048Part Number: 21048-NBKType: Aquastat Hi/Lo Limit ControllerApplication: Outdoor wood boilers, hydronic heating, radiant floor heating, hot water tanksReplaces / Cross-ReferenceHoneywell: L6006A1145Common ApplicationsOutdoor wood boilers and biomass boilersHydronic baseboard and radiant floor heating systemsHot water storage tanks requiring dependable high/low limit controlHeating loops requiring reliable high-limit protectionWhy Choose the NBK-21048?When your heating system needs dependable temperature protection, the NBK-21048 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 L6006A1145.