An immersion heater operating at \(1000 \mathrm{~W}\) is in the form of a rectangular solid with dimensions of \(16 \mathrm{~cm}\) by \(10 \mathrm{~cm}\) by \(1 \mathrm{~cm}\). Determine the heat transfer coefficient and the surface temperature of the heater if it is oriented with the \(16-\mathrm{cm}\) dimension vertical and immersed in water at \(295 \mathrm{~K}\). Assume natural convection heat transfer.