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Wood and sun for modern heating

Our universal buffer storage with integrated solar register. Beside the known product highlights of Akku-ESP the Akku Solar disposes of two different heating circuits: One is heated by the boiler, the other one by the sun.

The solar buffer storage makes the Akku-Solar to the optimal upgrading of the multifunctional buffer storage Biosolar. The additional solar register enlarges the heat exchanger surface for integration of solar thermal systems and increases their efficiency.

Dimensions: Akku-solar 500, Akku-solar 850, Akku-solar 1000, Akku-solar 1500

your great benefit:
  • + optimal combinable with different heat sources (oil-, gas-, biomass boilers etc.)
  • + expandable by parallel connection for higher buffer volumes
  • + perfect combinable with the fresh water module EFM-30 for warm water heating
  • + connections for the integration of solar energy by solar battery chargers with plate heat exchangers
  • + installation option for totally 5 temperature measurement points with standard immersion pocket and thus high flexiblity: depending on the immersion pocket resp. more than one temperature sensors per measurement point are possible.
  • +

  1. Solar buffer storage
  2. fittings for flow direction
  3. coating construction to integrate the return flow at the right temperature level
  4. extra strong flexible foam insulation with synthetic coating for optimal thermal insulation
  5. heat exchangers for optimum utilisation


  1. from the boiler
  2. to the heating manifold
  3. from the heating manifold
  4. to the boiler
  5. differential control Lago SD1
  6. solar expansion vessel Elko-flex EDER solar
  7. Elko-flex EDER maintenance unit

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