Minerals in the water are heavyer then the water, they settle to the bottom of the tank.
If the bottom of the tank is covered with hardened up minerals it's going to take longer to heat the water.
Your plumber is wrong.
If you have old steel pipes, or an old steel lined heater trying to drain the rust out would be useless.
If the bottom of the tank is covered with hardened up minerals it's going to take longer to heat the water.
Your plumber is wrong.
If you have old steel pipes, or an old steel lined heater trying to drain the rust out would be useless.