Zilmet ZEP-1 Thermal Expansion Tank for Tankless Water Heaters



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ZEP-1 was designed to provide maximum protection to the heat exchanger and the piping system on tankless water heaters, relieving problems associated with excess pressure by absorbing any potential increase in pressure within the unit or piping system; this helps prevent potentially costly leaks and repairs.

  • UV resistant and approved for outdoor installation
  • Entire tank is constructed of 304 stainless steel
  • Air charge can be adjusted, and is serviceable
  • Tank has a 50 PSI factory precharge
  • NSF61 Certified

Technical Specifications


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