For an electric water heater on alternating current, there is not 'positive' or 'negative'. There should be terminals labeled hot and neutral, though.
Wouldn't recommend.
ring a plumber up
Not really.
No way to fix that - your tank is scrap.
if an element is constantly expanding and contracting (if you keep switching the hot water heater off and on again) all the time it causes cracks and over time the water leaks into the element causing it to short which means you have to replace it.
In a gas water heater: The gas flame warms the water, exactly the same way as a gas stove burner does for a pan of water on the stove. In an electric water heater, an element - same as an electric range element, but a different shape - heats up from electrical current, and transfers that heat to the water.
gas water heater timer. save up to %30 on monthly water/heater/energy bill and its a 'green' solution.
no as it will burn out the element
Yes you can.
increase
Both. It is slightly negative from one side and slightly positive from the other.
If the water from the faucet is tepid or cold, it might be time to check the electric hot water heater element. Electric hot water heaters are equipped with two heater elements that heat water. They do so through an electrical current the goes through the element. The lower element does the hard work and is most likely to be the first that burns out. Turn off the electricity, and disconnect the wires at the heating element terminals. Set the multimeter to read resistance. Touch the clips on each terminal of the element. If the Ohmmeter doesn't budge, the element is shot.