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At Solar is Hot we use primarily SunEarth controllers designed and manufactured by Steca.  They are reliable and have a proven control logic incorporated into each model.

For many applications their 300 Series controller is affordable and applicable.  For some applications, their 500 Series is more appropriate.  The 500 Series allows measuring and logging of performance, control of additional outputs (for example pumps of valves), the reading of additional temperature sensors and the option to monitor a flow meter and/or a pressure sensor.

Steca 503 controller

Steca 301 controller