Why not pour a kettle full of water if you need to boil water in it?

When heated, the liquid expands, its volume increases according to the formula: V2 = V1 * (1 + β * Δt). Where V2 is the volume of liquid at t2, V1 is the volume of liquid at t1, β is the coefficient of volumetric expansion, Δt = t2 – t1 is the temperature change.
If the kettle is poured to the top with water, then when heated, the water from the kettle will pour out. Also, during boiling, there is intense evaporation from the entire volume of liquid, which will lead to pouring out of water from the kettle.