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1000 - 2000 l
KOSTRZEWA Buffer W2 stratified storage tank with two coils and with 10 cm fleece insulation.

The buffer tanks for storage of heating water are used as a hydraulic separator or thermal storage. The tanks are compatible with the central heating boilers as thermal storage.
Product made in Austria
W2 Buffer
1000 l 1500 l 2000 l
W2 Buffer

Both the housing and the fleece insulation can be removed for easy installation and positioning (install in reverse order).


The thermal energy from the KOSTRZEWA storage tank is being stored in layers, so that the heat can be used on demand.


Combine the different heat generators based on the simple law of physics for best performance. Hot water is lighter than cold water and thus the energy is stored in layers.


The surplus of thermal energy can be stored for a long time without significant losses, and the heat can be used on demand.





Charging 30%capacity

bel2 (2)

Charging 60%capacity


Charging 100%capacity


Discharging 30% capacity


Discharging 60% capacity





Storage tank features:
  • fleece insulation 10 kg/m3
  • coefficient of thermal conductivity 0.042 W/m2
  • B2 fire rating
  • high quality J235JR steel sheet
  • four connectors (two heating devices, e.g. central heating boiler and hydronic fireplace)
  • bottom coil (for solar hot water system/heat pump)
  • top coil (for solar hot water system/heat pump)
  • 4 temperature sensors
  • warranty: 3 years
1000 l 1500 l 2000 l
Max. operating temperature °C 95 95 95
Max. operating pressure bar 3 32080 22003
Bottom coil surface area m2 2,8 3,5 4,2
Top coil surface area m2 2 2,4 2,6
Insulation thickness mm 100 100 100
Diameter with insulation mm 990 1200 1300
Diameter without insulation mm 790 1000 1100
Tank height mm 2090 2198 2420
Tilted dimension mm 2080 2200 2430
Tank weight kg 192 308 369