Apricus have been installing evacuated tube systems in Australia for over 10 years. The pump that is used is a high quality pump designed for solar and manufactured by Grundfos. Having a controller provides added functionality such as real time temperature read outs, data logging, over temperature control and makes troubleshooting and future servicing much faster.The controller is made in Germany by a company called Resol – who have been manufacturing and supplying controllers throughout Europe and the world for many years.