Heat accumulator Pellaqua


The Pellaqua cylinder range developed by ÖkoFEN is the optimum interface between your pellet boiler and the solar collectors. With their various layout options, the three different types of cylinder provide the optimum solution for your heating system.

The system cylinder is the absolutely versatile and powerful complete solution for your boiler room.


Cylinder sizes

  • 600 litres
  • 800 litres
  • 1000 litres
  • 1500 litres*
  • 2,000 litres*


* Only as buffer cylinder with no DHW heating or heating circuit assemblies


To online product advisor

A buffer cylinder ensures maximum efficiency from your pellet heating system

The Pellaqua system cylinder:

It perfectly unites domestic hot water heating and central heating using pellets and solar.


Standard equipment

  • Buffer cylinder made of high-grade steel
  • Return stratification conduit in all models
  • 8 coupling sleeves with 1½“ female thread
  • Connections arranged at 90°
  • 4 sensor couplings for ½“ sensor well
  • 5 sensor holders for contact sensors
  • 1x ventilation 1½“ female
  • Floor insulation
  • 100 mm fleece insulation
  • 4x connector insulation
  • Operating pressure: 3 bar
  • Max. operating temperature: 95 °C



  • Stainless steel corrugated-pipe heat exchanger
  • Fresh water module
  • Up to two heating circuit assemblies
with stainless steel corrugated-pipe heat exchanger

with stainless steel corrugated-pipe heat exchanger

100 mm fleece insulation

100 mm fleece insulation

for lower heat loss
Heating circuit assembly

Heating circuit assembly

including insulation
Solar heating coil

Solar heating coil

Solar loading group

Solar loading group

Return stratification conduit

Return stratification conduit

for better stratification
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