RESOL DeltaSol® BS/4 to suit Apricus solar hot water systems (1-3 sensors)


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RESOL DeltaSol® BS/4 to suit Apricus solar hot water systems (1-3 sensors)

Solar Hot Water Parts includes heat transfer paste and joiners with this controller. We are also trialling free 5ml silicone tubes to help make replacement even easier.

The RESOL DeltaSol® BS/4 controller provides a clear operating concept and is equipped with the illuminated combined display with system-monitoring. Flashing symbols for sensors, pumps and valves enable an immediate allocation of temperatures, temperature differences and active actuators. This makes adjusting and monitoring the solar system quick and easy. The RESOL DeltaSol® BS controller is available from in 2 versions, depending on the demands. Details concerning the number of the relays as well as additional functions are shown in the technical data.


The RESOL DeltaSol BS/4 (1-3) comes with:

  • 1 x 20m roof sensor
  • 1 x 2.5m tank sensor
  • 1 x 2.5m upper tank sensor
  • Australian power supply (fitted)
  • Female pump lead (fitted)

Technical Specifications - RESOL DeltaSol® BS/4 Solar Controller 

    RESOL DeltaSol® BS/4 controller has 3 basic system layouts to choose from

    Drainback option

    Heat quantity measurement

    Tube collector function, thermal disinfection function

    Commissioning menu

    Unit ºF and ºC selectable

    HE pump control via adapter

    Aux relay for hot water system element can be easily added to this model.

Take a moment browse our site. We stock a range of accessories to suit the RESOL DeltaSol BS/4 controller. Accessories are easy to connect simply to the VBus on the controller. It is as easy as adding a sensor. The RESOL DeltaSol BS/4 controller is used in the Apricus and Thermann solar hot water systems.

The RESOL DeltaSol BS/4 controller has an IP rating of 20, which is fine for indoor use. If using outside, we recommend using a moisture-proof housing. We do sell a version of this controller which includes a moisture-proof housing.  Take a moment to browse our Pump Station section in Parts for more information. 

Moisture proof housing to suit RESOL controllers