Solar and system controllers

Solar and system controllers Solar thermal systems are operated and controlled by solar controllers. RESOL differential temperature controllers are used in solar, heating and air-conditioning systems to initiate switching processes depending on thermal, hydraulic and environmental conditions. Apart from these basic functions, RESOL controllers offer a variety of options and functions for the optimum use of individual solar and heating systems.


ROSA, the RESOL Online System Assistant, helps you choose the right RESOL controller for your solar thermal and heating system.

RESOL Comparison

Pump stations & accessories

Pump stations & accessories Pump stations offer solutions for the efficient use of a system through harmonised components. They contain all units necessary for the operation of a solar system. Installation and initial operation of the stations are easy, because the components are already pre-assembled and ready to plug in.

Datalogger & VBus®-accessories

Datalogger & VBus<sup>®</sup>-accessories Data communication between different components takes place via the RESOL VBus®. The controllers are therefore able to communicate with additional modules, allowing the system to be analysed and adapted to the individual consumer and system.

Tools & HE accessories

Tools & HE accessories RESOL tools and HE accessories are indispensable tools for craftsmen, service technicians and lab workers alike – they facilitate the maintenance of solar thermal and heating systems and help increasing efficiency as well as reliability and yield stability.

Measuring instruments

Measuring instruments Thermostats, measuring instruments and calorimeters are important devices for the installer as well as for the end user. A thermostat is an electronic controller which compares the temperature detected by the sensor to the preset value and controls it using actuators, such as pumps and valves, to achieve that value. The purpose of variable controllers for circulation systems is to make warm water available without delay. Furthermore, the RESOL product range includes components such as measuring instruments and calorimeters which can be used separately.


Sensors Sensors are used to detect certain quantities such as temperature and irradiation. Platinum sensors, which change their electrical resistance proportionally to the temperature, are used for temperature measurements. The sensor type is indicated by the third letter “P”, for example: FKP or FRP. FK designates the sensor of the heat source (e.g. collector sensor) and FR the reference sensor (e.g. storage sensor). These sensor types have the same electrical features. They differ only in the connecting cable.

Spare parts & accessories

Spare parts & accessories Accessories such as remote controls, auxiliary relays or additional modules are used to add further functions to the solar or heating system. By means of a heating circuit module, an additional heating circuit can be controlled, other accessories enable the connection of further loads or the remote adjustment of the system. Spare parts for our appliances ensure a quick and professional maintenance and repair.