The drain at the bottom gets plugged with sediment from the water. There is really nothing to be done to unplug it. Depending on your water quality, there could be a foot of rust in the bottom of the tank.
If it is more than 3-4 years since you last drained it then grungy rust and muck will be covering the drain. It is often necessary to fit a garden hose to the incoming pipe and try to blow it out.
If electric shut off the current to the elements, if gas shut off the gas valve. Open a hot water faucet to give it air, open the drain valve on the bottom of the heater.
If water is dripping out of the heater core it is about to go.
Yes
The water heater may be rusting out. Try flushing it. This involves hooking a hose to the faucet on the bottom of the water heater, opening the valve for a few minutes, and then closing it. Have the hose discharge into a bucket or a drum to see if there is a large amount of rust. If so, you should replace the water heater. == Answer== It sounds like they used a black nipple on tub spout. you need to change to galv. or brass. hope this helps.
If you have an instantaneous hot water heater, and your faucet doesn't flow enough water it won't turn on the water heater. Thus requiring another faucet to be turned on.
If water is only drawn from the cold faucet, then no, the water heater is not involved. However, if water is drawn from the hot faucet- even for a few seconds- hot water IS withdrawn from the heater, and fresh cold water drawn in to be heated- even if the hot water did not make it all the way through the pipe to the faucet- and the water heater will work to heat that fresh cold water.
Water is coming down from upstairs or it is back pressure from the water heater. If it is the water heater, it can come out of either side of the faucet.
your heater core is going bad
When you want to know when your hot water heater is broken, simply run your faucet and test the water. If it's cold, the heater is broken.
the heater core or heater core hose is leaking engine coolant
Possibly ruptured heater core. if you are losing coolant-check it out.
It's probably the heater core that's sprung a leak.