• Caleffi Solar Expansion Tank - 7 gallons - 259024

    - 3/4 inch straight thread connection

    Product ID • CAL259025000

  • $106.95
  • Quantity:
  • Free Shipping Eligible


Caleffi Solar Expansion Tank 7 gallons - 259024 is used for solar hot water heating systems using flat panels or Evacuated Tubes.

Modern solar heating systems can reach temperatures of up to 385°F during inactivity. The result is the vaporization of the solar liquid and extreme temperatures in the solar circuit, up to the solar station. This damages parts of the system, including pumps, connection joints and the diaphragm in the expansion tank. Furthermore, in the event of prolonged heat absorption, for example in the summer, when on vacation or if the electricity is out, the pressure of the solar systen can increase to the point of activating the safety relief valve. In order to support the highest possible inactivity temperatures, the special heat-resistant diaphragm in the Caleffi SolarPlus 259024 expansion tank can withstand temperatures up to 210°F.

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Technical Specs

Caleffi Solar Expansion Tank 7 gallons - 259024 Techs and Specs

  • Capacity
    7 gallons
  • Body
    Welded Steel
  • Connection
    3/4 inches Male Thread
  • Coating
    Epoxy paint
  • Diaphragm
  • Solutions Medium
    Water and/or glycol
  • Maximum percentage of glycol
  • System temperature range
    32 to 250°F
  • Maximum diaphragm temperature
  • Maximum working pressure
    150 psi
  • Pre-charged pressure
    35 psi
  • Weigth
    21 pounds

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