A hot water and steam generator includes a base, a first seal plate mounted on the base, a container mounted on a side of the first seal plate, a second seal plate mounted on the base, a mounting ring mounted between and sealed by the first seal plate and the second seal plate, and a rotation wheel rotatably mounted in the mounting ring. Thus, the hot water and steam generator increases the water temperature rapidly due to collision and friction of water molecules by rotation of the rotation wheel so as to produce hot water and steam easily, rapidly and conveniently.