• Brand: Zilmet
Zilmet is the world's largest supplier of hydronic tanks, producing well over 4 million annually. With Zilmet's line of Cal Pro expansion tanks, Zilmet offers a full range hydronic expansion tanks. All of the tanks are diaphragm hydronic expansion tanks produced with an SBR diaphragm in accordance to CE norm 97/23 for non-potable heating systems. All of Zilmet's floor mounted Cal pro tanks have a side connection which allows for easier and quicker installation.
  • Features and More


  • Shorter, Wider Design Leads to Longer Life
  • Each Tank is Factory Leak Tested to Ensure Tank Integrity
  • Certified Synthetic SBR Rubber Diaphragm
  • All Diaphragms Designed to Maximize Drawdown
  • Mig Welding Eliminates Interior Rough Spots and Sharp Edges
  • Welded Side Outlet Allows Easy and Quick Installation
  • Low Profile Tank Design with Full Membrane Depth Eliminates Stretching of Diaphragm, Providing Increased Life Cycle
  • External Baked Epoxy-Polyester Coating Provides a Durable, Appliance Like Finish
  • Protected PreCharge Valve Eliminates Potential Leak Path
  • Side Connection (on Stand Models) Allows for Easier and Quicker Installation