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There are now more than 200,000 solar water heating systems installed and working in Europe. However, until recently, very little has been known about the performance of these systems, since few of them have been monitored. In this report, a compilation of the performance results obtained from 28 monitored systems within the European Community is presented for the first time. By pooling information together in this way it is possible to identify common trends in system performance, and to present some of the knowledge now gained about the operational characteristics of solar water heating systems. By this means, better systems may be designed in the future. Topics covered include climate; building types; solar collectors; heat storage; technical factors; monthly performance; annual performance; and system costs.