Aquastat Hi/Lo Limit Controller | NBK-21189

NBK-21189 – Aquastat Hi/Lo Limit Controller – Special Order

The NBK-21189 Aquastat Hi/Lo Limit Controller is designed to provide precise temperature regulation for hydronic heating systems, outdoor wood boilers, and similar applications. It accurately controls high and low temperature cut-offs to protect systems from overheating and ensures efficient, safe operation.

⚠️ SPECIAL ORDER NOTICE: This product is special ordered from NBK, which means it will incur an additional 1–2 business day processing time prior to shipping.

Key Features:
✅ Hi/Lo Temperature Control: Provides dual setpoints for high and low temperature regulation, maintaining consistent system performance
✅ Versatile Application: Suitable for outdoor wood boilers, hydronic heaters, and a range of heating system configurations
✅ Reliable Safety Shutoff: Automatically interrupts burner or circulator operation if the set temperature limits are exceeded
✅ Adjustable Differential: Allows fine-tuning to achieve desired system cycling characteristics

Specifications:
📌 SKU: 21189
📌 Category: Outdoor Boiler / Limit Controllers
📌 Type: Aquastat Hi/Lo Limit Controller
📌 Operating Range: Suitable for standard hot water heating systems

Equivalent To:

• Honeywell: L6006C1018/U

Typical Applications:

• Outdoor wood boilers

• Hydronic baseboard or radiant heating systems

• Hot water heater tanks requiring reliable limit control protection

Why Choose This Aquastat:
The NBK-21189 provides the dependable high and low limit temperature protection essential for safeguarding heating equipment. Its robust construction and proven design ensure consistent system operation and help extend the life of boilers and associated components.

Shipping & Availability:
🚚 As a special order item from NBK, please allow an additional 1–2 business days for processing prior to shipment.