Bestank Solar expansion series tanks are being designed in order to control the expansion & contraction of the water due to exceed of heat in the closed circuit systems and thus to provide safety operating of the system and to make the system work in the most efficient way.


Tank Metal Body

  • Interchangable membrane due to screw connection flange cover at the bottom of the tank
  • Flange cover and water connector made of stainless steel material
  • Resistant up to 10/16/25 bars
  • Outer surface with epoxy powder paint
  • All tanks CE 97/23 Certified
  • Option: Flanges available in carbon steel upon request


  • Butly-Special Solar membranes suitable for high temperature applications
  • Suitable for use up to 100°C(allowing limited use up to 130°C)
  • Suitable for use with Ethylene-or Propylene-Glycolic mixtures
  • Very low gas permeability
  • DIN 4807-3 certified
  • Option: EPDM membranes available upon request

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