Instead of using a conventional water heater, which stores hot water in a tank for later use, people are switching to using flash water heaters, which heat the water quickly as it's being delivered to the shower, rather than store hot water. If a typical shower uses 4L/min of water, and the water needs to be heated from 10°to 49°C, what must be the power output of the flash heater to maintain a supply of hot water? Note that the specific heat of water is 4.184 kJ/kgK.
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