Preferred Construction Products

Tankless Potable Expansion Tank

BigGuyXpansionTanks® through Elbi offers a thermal expansion tank for a tankless water heater.


  • Designed to absorb thermal expansion and pressure surges from tankless water heater than have 2 gallons or less of water volumne
  • Pre-set factory pressure at 50 PSI
  • Constructed of 304 stainless steel
  • 1/2″ MPT connection
  • Maximum design pressure of 145 PSI
  • Maximum design temperature of 210°F
  • Tested and approved by IAPMO to NSF 61 standard for potable water

Item No.DescriptionConnection Max PSI Case Pack
BG-12-TWH-2Tankless Water Heater Tank w/ Air Valve 1/2"145 PSI 24