Buffer Tank Sunsystem, Model PR 300, Capacity 300L, One heat exchanging coil


Availability: In stock

SKU: 0000000296

Saving energy and money is achieved using buffer vessels of the Sunsystem PR series in the central heating system.


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Product Description

The buffer tanks of series PR of the company SUNSYSTEM used for improving the performance and efficiency of heating, through the production and storage of hot water, which is used in the central space heating system. These specific buffer tanks allow the use of up to 2 external heat sources and optional kit for electric heating with nominal power  3kW, 4.5kW, 6kW or 7.5kW.

Accumulates the heat generated by boiler; recommended for each space-heating system.  Ensures optimum operating mode of biomass boiler, permitting its functioning at nominal power output even when the heating system does not need all the heat energy produced thereby.
Produced heat is accumulated and stored inside the buffer tank and can be used even when the boiler itself has cooled down.

Product Features

  • Range of volumes of 300-3000 liters
  • Upright storage tank made of steel S235JR
  • Primer coated on the outside
  • CFC free soft PU-foam insulation with thickness of 100 mm 
  • PVC coating in RAL 9006 or other colors on demand
  • All threads are internal
  • Option for installing a heating element as back-up source of heat
  • Compressive strength 3 bar

Energy efficiency Buffers

Energy Efficiency Directive 2010/30 /EU, 
Regulation 812/2013:

Class E - capacity from 300 to 500 Liters;
Class Е - capacity from 800 to 1000 Liters;

Buffer tank PR series

1. Aesthetic PVC jacket with color RAL 9006
2. Primer coated outer surface
3. Removable insulation
4. Water tank of low-carbon steel
5. Lower coil S1

Additional Information

2 Years

Weight (kg)

Country of Manufacture

Product Brand

Water capacity/content (L)

Heat exchanger coil
One heat exchanger coil

Free standing

Dimension Height (mm)

Height without insulation (mm)

Diameter (mm)

Diameter without insulation (mm)

Minimum vertical clearance (mm)

Insulation weight (kg)


Lower coil S1 heat exchanging surface (m²)

Lower coil S1 capacity (L)

Buffer operating pressure (bar)

Coil operating pressure (bar)

Maximum coil operating temperature (°C)

Maximum buffer operating temperature (°C)

Recommended size of the boiler connected to the buffer (kW)
6 - 10

Sensor sleeve A (mm)
G 1/2'' / 410

Electric heating element B (mm)
G 1 1/2'' / 760

Sensor sleeve C (mm)
G 1/2'' / 1060

Air vent sleeve D (mm)
G 1 1/2'' / 1410

Boiler heat carrier E (mm)
G 1 1/2'' / 1170

Sensor sleeve G (mm)
G 1/2'' / 1010

Boiler heat carrier H (mm)
G 1 1/2'' / 880

Boiler heat carrier J (mm)
G 1 1/2'' / 770

Heat carrier inlet L (mm)
G 1'' / 660

Boiler heat carrier M (mm)
G 1 1/2'' / 540

Sensor sleeve N (mm)
G 1/2'' / 420

Heat carrier outlet O (mm)
G 1'' / 260

Boiler heat carrier outlet P (mm)
G 1 1/2'' / 150


Files & Manuals

There are no available files to download. Please contact us if you need any further information.