The answer to 'sewer line no hot water' is that the issue is likely not related to the sewer line, but rather to the hot water heater or the plumbing system that supplies hot water. Common causes include a malfunctioning water heater, a clogged or damaged hot water line, or a problem with the water supply.
If you have no hot water at all, the issue is most likely with the water heater itself, such as a thermostat or heating element failure. If the hot water is only affected in certain fixtures or areas of the home, the problem is more likely in the hot water distribution system, such as a clogged or damaged pipe. In either case, it's best to have a professional plumber diagnose and repair the issue to ensure proper and safe hot water function.