What is more energy spent on heating water or an aluminum kettle, if their masses are the same?

The required amount of heat can be calculated using the formula:
Q = С * m * ∆t, where С is the specific heat capacity of the substance (J / (kg * K)), m is the mass of the substance (kg), ∆t is the change in the temperature of the substance (ºС).
The masses of the water and the kettle are equal, the temperature change is assumed to be equal for the water and the kettle.
Water:
Qw = Sv * m * ∆t (C = 4200 J / (kg * K)).
Aluminum kettle:
Qа = Ca * m * ∆t (C = 920 J / (kg * K)).
Since Qw> Qa, more energy must be spent on heating water.
Answer: More energy is needed to heat the water.