This compact solar controller is designed for singlecollector, singletank thermal systems. It supports both conventional and HE pump control, provides precise temperature measurement, and controls circulation and backup heating through two relay outputs. The unit is sized for small to medium domestic solar hot water installations and compatible visualization systems. Key benefits Precise temperature control: Temperature measurements accurate to plus or minus 0.1 C for reliable pump and heating decisions. Flexible pump compatibility: Works with conventional or HE pumps to match existing system hardware. Simple, compact installation: Controller dimensions 178 mm x 120 mm x 43 mm fit standard control locations. Low power draw: Operates from AC 100240 V, 5060 Hz with power consumption up to 2.5 W. Complete sensor support: Three sensor inputs support one collector sensor and two tank sensors for accurate system monitoring. Backup heating support: Dedicated relay for a backup heater up to 500 W. Durable operating ranges: Collector and tank temperature sensor ranges and ambient limits cover typical solar thermal conditions. Basic protection: IP41 enclosure rating suitable for indoor installation in protected locations. Technical specifications Controller size: 178 mm x 120 mm x 43 mm Power supply: AC 100240 V, 5060 Hz Power consumption: up to 2.5 W Temperature measurement accuracy: plus or minus 0.1 C Collector temperature range: minus 10 C to 220 C Tank temperature range: 0 C to 110 C Maximum output load: 300 W Suitable backup heating power (HK): 1 piece 500 W Inputs: 3 sensor inputs 1 piece Pt1000 sensor for collector, rated to 500 C, silicone cable rated to 280 C 2 pieces NTC10K B3950 sensors for tank, rated to 135 C, PVC cable rated to 105 C Outputs: 2 relays for circulation pump and backup heating Ambient operating temperature: minus 10 C to 50 C Water protection grade: IP41 Application capacity Maximum number of collectors: 1 Maximum number of storage tanks: 1 Maximum number of relays: 2 Maximum number of sensors: 3 Maximum number of visualization application systems: 1 Practical use scenarios Solar domestic hot water system: Control a single flat plate or evacuated tube collector and one hot water storage tank. The controller operates the circulation pump based on accurate collector and tank temperature readings and enables a 500 W backup heater when required. System replacement or retrofit: an existing singlecollector controller in a small residential installation. Compatible with conventional or HE pumps and supports the supplied Pt1000 and NTC10K sensors. Monitoring with visualization: Integrate with one visualization application system to display collector and tank temperatures and relay status, helping with system monitoring and diagnostics. Compatibility and installation notes Requires three sensor connections: one Pt1000 collector sensor and two NTC10K tank sensors as specified. Input and cable ratings should match the sensor temperature ratings: silicone cable for collector temperatures and PVC cable for tank sensors. Designed for indoor or protected location installation given the IP41 rating and ambient limits. Power connection: AC 100240 V, 5060 Hz. This controller provides accurate temperature measurement and straightforward control for singlecollector, singletank solar thermal systems, supporting both pump types and a backup heater while maintaining compact size and low power consumption.