Steca Differential Temperature Controller

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TR 0301 U
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3.00 LBS
$14.95 (Fixed Shipping Cost)
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ETG Solar
Steca Differential Temperature Controller

Steca Solar Controller


Controls Solar Thermal System with 1 storage tank | 3 inputs, 1 output

The Steca TR 0301 U controller was specially developed for the North American market based on the Steca TR 0301 basic controller. With its special certification (ETL label) from a Nationally Recognized
Testing Laboratory (NRTL) in the US, the controller meets the safety standards and minimum requirements of the North American market.

A feature of the Steca TR 0301 series of controllers is the animated graphic display, which offers a complete visualisation of the solar energy system‘s operating status and solar circuit.

The clearly arranged display ensures easy operation using pictograms. The controller was jointly designed with an internationally renowned design centre. The controller is used for monitoring and controlling solar thermal systems with one collector array and one storage tank. In addition, the controller performs important system monitoring and safety functions to ensure safe and long-lasting operation of the entire system. The numerous additional functions of the Steca TR 0301 U also include a maximum storage tank temperature function, a tube collector function, an anti-freeze function, a holiday and storage recool function as well as a choice of temperature indications in either degrees Celsius (°C) or Fahrenheit (°F). The operational safety of the system is supported by a sophisticated
fault diagnosis. The multi-coloured LCD backlighting ensures quick and safe location of occurring errors and facilitates quick troubleshooting.

The Steca TR 0301 U controller is supplied with a pre-fitted US mains connection cable and a preinstalled, pluggable pump output.

Product features

  • Compact, multipart designer casing
  • Maximum storage tank temperature
  • High level of operational safety through fault diagnosis
  • Temperature display °C / °F
  • Collector overtemperature disconnection
  • Spring clamp terminals allow rapid and easy installation


  • Graphical LCD display with backlighting
  • Animated representation of the systems and operating states


  • Non-verbal menu navigation
  • Side switch for manual, auto, off


  • Holiday (storage tank recooling)
  • Interval / tube collector
  • Anti-freeze
  • Display storage tank top
System voltage 120 V AC, 60 Hz
optional 240 V AC, 60 Hz
Own consumption ≤ 1 W [≤ 0.001 HP]
Inputs 3
3 x temperature (Pt1000)
Output 1
1 x switch output relay (R1),
max. 400 W / 0.5 HP (120 V AC)
or 800 W / 1 HP (240 V AC)
Line cord 75 inch, 3 x 18 AWG at 221 °F
Turn-on temperature difference 16 F
Turn-off temperature difference 8 F
Ambient temperature 0 °C [+32 °F] ... +45 °C [+113 °F]
Degree of protection IP 20 / DIN 40050
Dimensions (X x Y x Z) 160 x 157 x 47 mm
[6.3 x 6.18 x 1.85 inch]
Weight 350 g [12.35 oz]
Temperature sensors 2 x Pt1000 1.5 m [59 inch]
silicone cable with bushing
(Measuring range up to + 180 °C [+356 °F])


Technical data subject to change without notice

Limited Warranty 2 Years