The answer to 'toilet no hot water' is that the issue is likely with the water heater or the plumbing connections, not the toilet itself. A common cause is a problem with the water heater, such as a malfunctioning heating element or thermostat. Another possible issue is a blockage or leak in the pipes supplying hot water to the toilet.
If the toilet is the only fixture in the home without hot water, the problem is likely isolated to that location. However, if other fixtures also lack hot water, the issue is more likely with the central water heater. In that case, you may need to call a professional plumber to diagnose and repair the water heater.