Solar Water Heater was a technology that used as a kettle by utilizing the thermal from solar energy. The media of heat storage in conventional SWH was water. Meanwhile, water had deficiency as heat storage which its energy density was low while it needs the larger volume. This research used phase changed material (PCM) as thermal storage as the solution of the problem. PCM that used was the mixture of paraffin wax and 10% copper powder which had high energy density. The aim of this research was to determine temperature evolution, absorption heat rate in PCM and water, and increased rate of PCM temperature and water in SWH tank with flux heat variation given that used charging method. Charging research conducted by using heater as a solar thermal simulator then the water was streamed by using pump inside of tank in heat flux variation by arranged regulator voltage in 190 volt, 201 volt, 220 volt, and 227 volt by using temperature. The data gathered in this research was direction recitation in every cross section in axial, vertical, and horizontal which would be process to determine the absorption rate of heat in PCM and water also the increasement of temperature rate in PCM and water. The result showed that there was temperature enhancement during charging process. The value of rate absorption which was got from paraffin wax and 10% copper powder in latent condition, it showed there was more received energy rather than rate absorption in sensible condition. The value of paraffin wax and 10% copper powder absorption was 180,96 joule/s in latent condition while in sensible condition the highest value of absorption was 44,26 joule/s. The absorption rate of our. The value of increasement heat rate of parrafin wax and 10% copper powder in latent condition was showed that the lower increasement was more accepted rather than sensible. The highest value of temperature increasement of paraffin wax and 10% copper powder was 13,05 latent condition while in sensible condition the highest increasement was heat flux then the absorption rate and enhancement also got higher.