Honeywell L4006A Aquastat Immersion Temperature Control 100–240°F

This Honeywell (Resideo) L4006A Aquastat Immersion Temperature Controller is a professional-grade control designed to regulate or limit liquid temperatures in commercial and industrial heating systems.

Commonly used in propane, LP gas, and natural gas-fired boilers, this immersion-type aquastat provides precise temperature sensing by inserting the 3/8″ x 3″ bulb directly into an immersion well (well not included on this model).

Key Features & Benefits:

• Controls water or liquid temperature in boilers and storage tanks

• Open-on-rise switching action for reliable system protection

• Adjustable 5°F–30°F differential for flexible system tuning

• Wide operating range: 100°F to 240°F

• Ideal for hydronic heating systems, circulator control, and high/low limit applications

• Durable metal enclosure built for industrial environments

Electrical Ratings:

• 8 Amps @ 120V

• 1.3 Amps @ 240V

This aquastat is commonly paired with gas-fired heating equipment and is trusted by HVAC professionals for dependable temperature regulation in demanding applications.

Important Notice – Propane Parts, Accessories, and Regulators

This product, including but not limited to propane parts, accessories, fittings, hoses, valves, and regulators, must be installed and serviced by a licensed professional in accordance with all applicable local, state, and federal codes, regulations, and standards.

The seller assumes no responsibility for the installation, inspection, application, maintenance, or use of this product.

It is the sole responsibility of the buyer to ensure the product is appropriate for their intended application and that it is installed correctly by a qualified individual.

Improper installation, maintenance, or use of propane products may result in serious injury, death, fire, explosion, or property damage.

The buyer accepts all risks, liabilities, and potential consequences associated with the use of this product.

By purchasing this item, the buyer acknowledges that they have read, understood, and agreed to these terms and confirm that installation and use will be conducted by a properly licensed and qualified professional.