Those early starts the holiday season and the later it ends, you know that these cold periods and the water in the sink just icy. But if the sink is plastic, it is very hot water poured into it is dangerous— capacity can warp.
I suggest to embed into the sink (or just omit it as in a tea Cup) low-power ordinary household kettle, which can be activated when needed, and a little warm water.
V. GOLOVASHIN, Rybnoe, Ryazan region.