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Zilmet has over 50 years of experience in manufacturing high quality diaphragm expansion tanks The Zilmet Flat expansion tanks provide both space saving and a cleaner, more professional look for hydronic system expansion. The flat tanks, which come both in round and rectangular shapes, offer the following benefits:

  • They serve as the perfect compliment for wall hung condensing boilers as they allow you to keep all components on the wall with the boiler
  • A union with a dual service check is included with each tank which allows for easier installation in tight places
  • The flat design and mounting bracket allow for a less expensive and quicker installation
  • The unique design allows for easier servicing of the system with unencumbered access
  • Allows for contractors to pre-assemble tanks by mounting them onto control boards in advance of installation
  • Come with a full 5 year warranty

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Capacity (Gallons):


Height (Inches):


Diameter (Inches):


Connection Size:


Max Accepted Volume:

2.4 Gallons

Connection Type:


Max Pressure (PSI):

43.5 psi



Precharged PSI:

12 psi

Max Operating Temp:



5 Years

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