A water heater takes 10 minutes to heat 2 kg of water at \(15^{\circ}\) to \(60^{\circ}\). Assuming that the input power was 1 watt, what is the efficiency of the water heater?

Submit your answer as x if your answer is x%

Assume the specific heat of water to be 1.

This problem is original and is inspired from the water heater in my bathroom.

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