Drain wont stop leaking

Turn Off Power or gas to heater, shut off incoming water supply, open the hot water side of a nearby faucet, attach hose to bottom drain valve, open drain valve, drain tank. Opening faucet should stop it from becoming vapor locked.

Bosch Aquastar 125B Water Heater Repair Parts Pre January 2003

Bosch Aquastar 125B Repair Parts Selection Grid

This web site has Aquastar 125B parts. It appears your unit was manufactured 7/7/02, so that is what I pulled up for you. At least this will be a start for you to locate the part. I hope these links work.






Bosch Aquastar 125B Water Heater Repair Parts Post February 2003

If you mean the drain valve, the cheapest, easiest fix is to buy a hose cap at the hardware store and cap it off. If you mean the relief valve which is located on the top or upper half of the heater, you must replace the relief valve. Do Not cap the relief valve it is a safety feature. If it leaks again you may have further issues

Turn off water, turn off power, drain tank:
Copy following link for illustrations
http://waterheatertimer.org/Emergency-steps-for-leaking-water-heater.html

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There should be a valve on the water supply line just above the water heater. There may just be a drain spicket located at the bottom of the water heater that is leaking. You may just be able to put a cap on it or try to turn it tighter to stop leaking.

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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You can try to crack it open and get a little piece of crud out of there, I'm sure that is all it is, Just get a tray or something to catch the water, It should stop it, If it gets worse, turn the water off to the heater, then open the valve and hope the bigger piece of crud comes out. It is about all you can do, other than drain the whole thing and take the valve apart and replace the rubber in it. Check it out, Hope this helps.

Hello MONON You could try a BOILER DRAIN CAP just screw it on the end of the drain valve to stop the drip.It is brass & avail at any hardware store.

What is the leaking pvc pipe connected to? The T & P valve on the side (or top) of the tank? Or is it an incoming cold or outgoing hot water line? If you have just lit the water heater, the T & P valve may drip, but only for a little while and it will stop. The T & P (temperature and pressure relief) valve may be bad and need replaced. Turn off the incoming cold water valve and turn the gas valve to off position. Then drain the water heater using the T & P valve, it will stop draining when the water level is just below it. Remove the T&P valve and replace with new one. Use thread sealing tape on threads. Or call a plumber if not sure.

drain valve must have already been leaking, that's why someone put the cap on. It's ok to cap the drain but never the pressure/temp relief. If the water is coming out of the drain (not around it) you could either replace the cap or the drain valve to stop the leak - otherwise it's time for a new water heater.