$${\Delta T = \frac{P \Delta t}{c_\text{Vesi} m_\text{vesi} } = \mathrm{\frac{(1,79\, W) (60\, s)}{(4200\, J/kg\cdot K) (0,2\, kg) }} = \underline{\underline{0,12\, \mathrm{K}}}}$$