Hydrolevel 1/2″ MPT Brass Hydrostat Insertion Well Boiler Aquastat

This Hydrolevel 1/2″ MPT Standard Insertion “Hydrostat” Well (MFG# 48-221) is designed for use with boiler-mounted aquastats and Hydrostat temperature controls in hydronic heating systems.

Manufactured from high-quality brass with a copper insertion well, this component provides reliable heat transfer for accurate temperature sensing while offering excellent corrosion resistance. The 1/2″ male NPT threaded connectionallows for easy installation into standard boiler tapping ports.

This insertion well is commonly used in gas-fired boiler systems, including propane (LP) and natural gas applications, where precise temperature monitoring is critical for safe and efficient operation.

Key Benefits:

• Compatible with Hydrolevel Hydrostat & standard Aquastat controls

• Brass construction ensures durability and long service life

• Copper well provides efficient thermal conductivity

• Ideal for hydronic, residential, and light commercial boiler systems

A must-have replacement or new-install component for HVAC professionals, maintenance technicians, and boiler service contractors.

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.