White-Rodgers 11B18-101 Control

The White-Rodgers 11B18-101 is a professional-grade well immersion control designed for precise hydronic temperature regulation in residential and commercial boiler systems. This SPST immersion control is specifically engineered to open on rise, making it a reliable high limit safety control or operating control for high-temperature applications. It features a flexible operating range of 100°F to 240°F (38°C to 116°C) and an adjustable differential from 5°F to 45°F, allowing technicians to fine-tune system cycles for peak efficiency and preventing rapid short-cycling. The unit is built for versatility with a convertible mount for horizontal or vertical installations at the boiler tapping.

Equipped with a 1/2" NPT standard shank well, this White-Rodgers immersion thermostat ensures rapid thermal response and robust performance under high-pressure conditions. The electrical ratings are substantial, handling up to 14A at 120VAC or 7A at 240VAC, accommodating a wide variety of circulator pumps and burner circuits. Its rugged gray finish and UL-listed/CSA-approved construction meet the strict requirements of field contractors looking for a durable replacement for older 11B18 series units or competitive aquastat controls.

• Precise Temperature Range: Supports settings from 100°F to 240°F, ideal for diverse hydronic heating requirements.
• Adjustable Differential: Field-adjustable 5°F to 45°F range provides granular control over system staging.
• Dual Mounting Orientation: Innovative design permits either horizontal or vertical installation for better fit in tight boiler rooms.
• Standard Shank Well Included: Comes with a 1/2" NPT well to protect the sensing bulb and ensure accurate heat transfer.
• Rugged Electrical Capacity: Rated for line voltage applications, simplifying wiring for standard heating systems.

Can the 11B18-101 be used as a circulator controller?
This model is designed to open on rise, meaning it breaks the circuit when the temperature reaches the setpoint. It is typically used as a high-limit or boiler operating control rather than as a circulator control (close-on-rise).

Is the mounting orientation fixed?
No, the unit features a convertible design that allows for mounting in either a vertical or horizontal position to accommodate the specific piping layout of the boiler.

What is the maximum electrical load for this control?
The SPST switch is rated for 14.0 Amps at 120V AC and 7.0 Amps at 240V AC, which is sufficient for most standard residential hydronic system components.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.