tubra®-ÜSTA L/XL

Solar thermal energy

The solar transfer station for stratified loading

  • compact modular design
  • with high-efficiency pumps
  • maximum solar collector area 130 m²,
    expandable to 260 m² by cascading
  • including pre-programmed systems on SD card
Scheme ÜSTA L/XL
Memory loading ÜSTA XL

combination of tubra®-ÜSTA XL and ÜSTA stratification loading set 

  • ÜSTA stratification loading set:
    for buffer tank, assembly with 2x DN 25
    3-way switching valves as double switching incl. insulation
System ÜSTA XL
Nominal sizeDN 25DN 25
Nominal capacity (18 l/m2h),
max 7K log Diff. prim. 60-34 °C
sec. 27-53 °C
45 kW65 kW
max. collector surface / cascaded
(flate plate)
90 m²130 m²
Solar pump (primary side)Wilo Para 15/8 iPWM2Wilo Para15/9 iPWM2
Buffer load pump (secondary side)Wilo Para 15/7 iPWM2Wilo Para 15/8 iPWM2
Dimensions H x W x D865 x 525 x 280 mm865 x 525 x 280 mm
max. working pressure (primary)6 bar6 bar
max. working pressure (secondary)3 bar3 bar
max. working temperature
primary flow / return
140 / 120 °C140 / 120 °C
max. working temperature secondary110 °C110 °C
Connections (primary)G1 IGG1 IG
Connections (secondary)G1 IGG1 IG
Gravity brakes20 mbar 20 mbar

tubra® accessory selection

Product portfolio Solar thermal energy

Solar stations/transfer stations from tuxhorn are designed for solar loading of buffer storage tanks.

tubra-ÜSTA S / M

nominal power
10 / 25 kW

see product

tubra-PGS 01

nominal power 13 kW
max. collector area
low 43 m² / high 26 m²

see product

tubra-PGS XL

nominal power 58 kW
max. collector area
low 116 m² / high 70 m²

see product

Please note that due to the upcoming public holidays in May, our company will be closed on both 10.05.2024 and 31.05.2024.

We will be back at the usual times from the following Monday.

Your Tuxhorn Team