The answer to 'why is my bathtub frozen' is that a frozen bathtub is usually caused by cold temperatures in the bathroom or pipes leading to the bathtub. This can happen when the temperature drops below freezing, causing the water in the pipes or tub to freeze and expand. Common symptoms include the tub not draining properly, water not running, or the tub cracking.
To fix a frozen bathtub, you'll first need to thaw the pipes and tub. This can be done by applying heat, such as using a space heater or hair dryer, to the affected area. You can also try pouring hot water over the frozen section. Once thawed, you may need to call a plumber to inspect for any cracks or other damage. Preventing future freezing involves insulating pipes, keeping the bathroom warm, and letting faucets drip during extreme cold.