The answer to 'why is my bathtub frozen' is that the pipes supplying water to your bathtub have likely frozen. This can happen when the temperature drops below freezing and the water inside the pipes freezes, preventing water from flowing. Common causes include inadequate insulation, drafts, or a malfunctioning heating system.
Signs your bathtub is frozen include no water flow, a frozen faucet, and potentially a cracked or burst pipe. To fix a frozen bathtub, you'll need to thaw the pipes. This may involve using a space heater, hair dryer, or other heating source to gradually warm the pipes. However, attempting to thaw frozen pipes yourself can be dangerous and may cause further damage. It's generally best to call a professional plumber to safely and effectively address the issue.