Conventional hot-water heaters consist of a tank of water maintained at a fixed

Question

Conventional hot-water heaters consist of a tank of water maintained at a fixed temperature. The hot water is to be used when needed. The drawback is that energy is wasted because the tank loses heat when it is not in use, and you can run out of hot water if you use too much. Some utility companies are encouraging the use of on-demand water heaters (also known as flash heaters), which consist of heating units to heat the water as you use it. No water tank is involved, so no heat is wasted. A typical household shower flow rate is 5.98

Explanation / Answer

Rate = m * Cp * T2-T1

= 9.47/60 * 4.186 * (50.6 - 10)

= 26.824 kW

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