The AD-HST 35 SO is a cascaded electric heating element for use in domestic hot water or heating water storage tanks to heat the water. The three different heating coils (500W, 1000W and 2000W) can be controlled in steps of 500W up to a maximum value of 3.5 kW (star connection) by means of three relays. Due to the electrically insulated design and the high quality metal alloy of the heating elements, corrosion damage is to be expected in water storage tanks. The AD-HST 35 SO is therefore perfectly suited for PV self-consumption optimization in combination with Adamczewski photovoltaic optimizers.The screw-in heating element is supplied with connection housing and a controller/limiter combination.

The AD-HST 35 SO is a commercial product of the company Türk+Hillinger Elektrowärme GmbH (Türk+Hillinger Art-Nr. 1105405).



Heating of domestic or heating water with PV surplus power

Caution: In the case of calciferous water, check for possible limescale buildup after three months at the latest, decalcify the radiator and redefine the maintenance interval.

Specific characteristics

  • three heating coils
  • 500W, 1000W and 2000W
  • 3,5 kW maximum power
  • suitable for 1,5" screw-in connections
  • integrated temperature controller
  • integrated STL (safety temperature limiter)
  • electrically insulated heating elements


Data sheet pdf en-hst35so.pdf (144 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Wiring data
Voltage 230 VAC / 400 VAC
Power total 3,5 kW
Number of pipe heaters 3
Power L1 500 W
Power L2 1000 W
Power L3 2000 W
Connection design Screw connection M20x1,5
Internal wiring Three-phase - star wiring
Surface load
Pipe heater 1 500 W - 2,8 W/cm²
Pipe heater 2 1000 W - 5,3 W/cm²
Pipe heater 3 2000 W - 10 W/cm²
Mechanical data
Immersion depth L 480 mm
Unheated zone (LU) 100 mm
Unheated length from sealing flange 100 mm
Max. water pressure 10 bar
Material screw head MS 58
Werstoff housing Polycarbonat
Material pipe radiator 2.4858
Protection level IP64
Mounting position Horizontal
Screw head G 1 1/2 DIN ISO 228
Wrench size SW 60
Temperature control
Setting range controller 5°C bis 85°C
Shutdown temperature STB 110°C - 8K



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