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AN INTRODUCTION TO HYDRONIC UNDERFLOOR HEATING
www.centralheating.co.nzA typical solar hot water system produces only about half an average hot water load in the winter - approximately 5kWh a day. Given that a typical winter heat load can be 50kWh to 100kWh a day or more, a large number of solar collectors will be needed with sufficient heat storage to last through the nights and the days with no sun.