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Watts Non-Potable Water Expansion Tank, 1 In FNPT Connection, Tank Volume 20.0 Gallons, Free Standing

SKU: 0066610

$649.00

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Product Details

Watts 0066610

This non-potable water expansion tank is designed for use in commercial and residential closed loop hydronic heating system piping to control thermal expansion of hot water and maintain system pressure below the relief setting of the relief valve. This carbon steel tank is pre-charged at 12 psi, tank volume is 20.0 gallons and features a durable expansion membrane that prevents contact of the water with the air in the tank. This rugged butyl diaphragm minimizes loss of the air change and ensures long and trouble-free life for the system. This tank is made of carbon steel with epoxy finish, free-standing, 1'' FNPT system connection and a 0.302-32'' charging valve connection (standard tire valve) to facilitate on-site charging of the tank to meet system requirements. The maximum working pressure is 75 psi (5.3 bar).


  • Finish Gray
  • UPC 098268219494
  • Online Product ID 9687856
  • Diameter 16"
  • Air Precharge 12 psi
  • Air Valve yes
  • Bladder Material Butyl
  • Inlet Connection Size 1''
  • Inlet Connection Size Metric 25 mm
  • Inlet Connection Type Female Threaded
  • Inlet Thread Type NPT
  • Maximum Operating Temperature Deg F 220
  • Maximum Working Pressure Psi 100
  • Mount Type Free Standing
  • Orientation Vertical
  • Series ETX
  • Stand Included yes
  • Tank Acceptance 8 gal
  • Tank Height 28.81''
  • Tank Material Carbon Steel
  • Tank Volume 20 gal

Additional information

  • Inline and free standing models
  • Precharged to 12 psi
  • Steel construction
  • Rugged flexible butyl diaphragm

About This Brand

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