If the leak is from the tank itself and not a connection, it's time to replace it.
If it is water you have a plugged condensation drain line that needs to be cleaned out. If it is engine coolant you have a leaky heater core that needs to be replaced.
Inspect bottom of tank by looking through combustion chamber. If water marks or heavy rusting is noticed or if water is noticed setting in combustion chamber bottom, then the water heater needs to be replaced.
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Yes, if your hot water heater is leaking, you need to call a plumber. A leaky water heater can be very dangerous and needs to be taken care of as soon as possible.
At the home depot website you can search up water heater and they will give you some information for parts and if that doesn't help then you can look up water heater repair. Here is a good website. http://www.lowesforpros.com/should-that-water-heater-be-repaired-or-replaced
While it's highly difficult to do so, you can repair a hot water heater depending on where it's leaking at. It could be something as simple as a seal just needs to be replaced, or it could be more serious like the actual plumbing with the water heater that's bad.
Sounds like you have a leaky heater core. You will need to replace the heater core and give the cooling system a good flushing, it shouldn't be rusty.
If it is water, it could be a plugged condensation drain for the ac. If it is engine coolant, it could be a leaky heater core.
The thermostat is broken and needs to be replaced. You need to disconnect the water heater until you can get it repaired to prevent over heating and a possible fire.
Check the heating elements in the water heater. These may be bad and need replaced.
Is it water or coolant? If it's water, you probably have a leaky windshield seal. If it's coolant you could have a heater control valve leak.
Yes it can be repaired. Depending how badly it's burnt, it may need to be replaced.