Here are some key points about neuropathy. More detail and supporting information is in the main article. 1  Neuropathy is a common condition. 2  Neuropathy is a complication of a number of different medical conditions. 3  Three types of nerve can be involved; autonomic nerves, motor nerves and sensory nerves. 4  Sometimes single nerves, or nerve sets are affected.
If you never remove the scale from a water heater tank the clanking or cracking noise heard at the water heater during operation may eventually cease when the scale solidifies, no longer trapping hot water and interfering with its movement upwards in the water tank.
Most of the time a water heater makes a rumbling noise because it has a large build up of slush at the bottom of the tank. All water heaters have an Anode Rod. This rod is made up of zinc composites (normally) and its purpose is to react with the bad minerals in the water and neutralize them.