Honeywell TK300-30 Sparco-Trol Ex

The Honeywell TK300-30 Sparco-Trol is a high-performance hydronic expansion tank designed to maintain system pressure in closed-loop heating and cooling applications. With a 4.4-gallon tank capacity and a 1/2" NPT connection, this steel expansion tank effectively manages the thermal expansion of water to prevent relief valve discharge and piping stress. Field technicians recognize the TK300-30 as the direct ET-30 replacement, offering a seamless swap for existing Amtrol or legacy Sparco installations. The internal heavy-duty butyl diaphragm ensures the permanent separation of air and system water, maintaining the 12 PSI factory pre-charge and preventing waterlogging. Rated for a maximum operating temperature of 240?F and a maximum pressure of 100 PSI, this tank is engineered for durability in demanding residential and light commercial hot water heating systems. Its compact design allows for easy mounting between joists, providing reliable thermal expansion control while preventing oxygen ingress and system corrosion.

• Universal Compatibility: Serves as the standard HVAC expansion tank replacement for most residential hydronic boilers and is a drop-in for TK300-30 vs ET-30 comparisons.
• Heavy-Duty Construction: Features a deep-drawn steel shell and a durable butyl diaphragm for superior pressure retention.
• Reduced Maintenance: The sealed air chamber eliminates the need for manual air charging and prevents the "hammering" associated with waterlogged tanks.
• Efficient Installation: Standard 1/2 inch NPT connection facilitates quick integration into existing air purgers or inline piping.

What is the correct pre-charge for the TK300-30?
The tank comes with a 12 PSI factory pre-charge, which is standard for most two-story residential systems. Always verify that the air charge matches the system fill pressure while the tank is empty of water.

Can this tank be installed in potable water systems?
No, the Honeywell TK300-30 is specifically designed for closed-loop hydronic heating systems. Using this model for domestic hot water may lead to tank failure due to different material requirements.

Where is the best location to install a Sparco-Trol expansion tank?
For optimal performance, install the tank on the suction side of the circulator pump at the "point of no pressure change" to ensure stable system operation and prevent cavitation.

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.