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.