Leaking drain valve

Clogged cold water nipple or clogged hot water nipple.
Is water hot at drain valve?
http://waterheatertimer.org/Low-hot-water-pressure.html

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See item # 9 ( 93844 ) at this link. Most RV places should stock the valve.
http://www.atwoodmobile.com/manuals/waterheaters/MPD%2093050%20PS%204.9.09.pdf

is this an area w/a threaded fitting?if so ,you turn off waterheater,drain,disconnect existing fitting,clean and rewrap with new teflon tape ,and retighten down.i only say to drain,because i am not sure if it is hanging and would not want to fall on you.teflon tape and rewrenching down should fix,unless soldered.then call your plumber.also if under warr.from installer ,less than 1 yr.,call them and tell them to fix it for free.i have over 13yrs in sheetmetal install,both in hvy.industrial down to many other types of home install of furnaces,a/c units,retrofits in /new and existing homes,waterheaters,garbage disp,refrig.water lines,gas etc

you can try opening it into a bucket most of them are threaded to hook a hose to it. opening it and closing it might fix the leak but if not just turn the power and water coming in and take a wrench and turn the old one out. and get a new one at your local hardware store or home supply store like a do it best store or lowes or home depot.

If you mean the drain valve, then buy garden hose cap at home center.
Cap will have rubber washer that seals tank.
If drain valve is plastic, the cap may not thread on without sanding down end of plastic drain valve.
Otherwise replace drain valve, which is simple if drain valve is brass, but can be difficult if drain valve is plastic.
Turn off power to water heater: Electric: turn off circuit breaker. Gas: turn knob to pilot.
Turn off water, open bathtub spigot on Hot side, drain water heater, remove drain valve with wrench.
If plastic drain valve breaks while being removed, then 'gently' break out broken part using hammer and big screwdriver.
Buy new drain valve at box store in water heater department.
Put teflon tape on new drain valve threads.
http://waterheatertimer.org/Water-heater-is-leaking.html
http://waterheatertimer.org/Water-heater-will-not-drain.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

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If it is plastic I would change it out and replace it with a brass drain valve. Some may call it a boiler drain valve. Depending on condition of the valve you currently have will determine if it is repairable.
You have to drain it down to repair and it would just be as easy to replace it since you drained it.
Most hardware stores should carry this valve
Below is a link with some information about upgrading the drain on the heater to avoid problems.

http://ezinearticles.com/?Avoid-Leaks-At-The-Bottom-Of-Your-Water-Heater:-Upgrade-Your-Drain-Valve&id=267639

Replace valve or if it has the usual diaphragm inside remove valve and replace washer/diaphragm
To prevent water draining from the whole system, turn off the taps on the heating pipes located just below the boiler AND the cold mains inlet

The 'overlflow line" is actually the discharge pipe from a safety valve. You should call a plumber to check it out. It could be simply the safety valve going bad but there could be other problems causing the problem. What ever you do, DO NOT plug the line because this could cause the water heater to explode.

It is possible that the water heater has a leak at the bottom. They eventually rust out. The valve should be removed if it is leaking and you should replace it. They are cheap. Be sure to use teflon tape to seal it back up

Nothing wrong with waterheater. Did you perhaps reverse hot/supply lines on new shut off valves?? try reversing lines. Maybe

Please rate. Thanks jj505