Resideo by HoneyWell Expansion Tank

The Resideo by Honeywell expansion tank (also called a hydronic expansion tank or diaphragm expansion tank) is built for closed hot water heating systems. It absorbs the expansion of heated water, which helps keep system pressure stable and protects boilers, piping and components from pressure spikes.

Key Features:

• Diaphragm design with a heavy-duty butyl diaphragm. The diaphragm separates the air cushion from the system water, which prevents waterlogging.
• Steel shell construction.
• Factory precharged, with a 12 PSI precharge.
• Rated for up to 100 PSI maximum operating pressure.
• Rated for up to 240°F maximum operating temperature.
• Female NPT system connection.
• Vertical-style tank that takes up little space for the volume it handles.

These tanks are intended for closed heating and solar loop applications in larger installations. They are not for potable water use. Resideo's installation instructions recommend mounting the tank on an air eliminator or air purger connection, which lets air vent automatically while the system keeps circulating.