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shut off water,gas or power Then drain about half of the water from the heater. The pop off valve unscrews from the tank. Some times its rusted really bad and will break off because its soft bras. If that happens then get a inside the pipe pipe wrench and try remove the broken valve. If that fails then you need a new water heater. There are a few types of valves some are lomger than others and some have a 90 degree turn. best thing is to get your old one out(if posible) before you buy the new one so you get the right one. Good luck
Question is unclear. What is a vacuum valve? You posted under electric water heater. Water heaters are associated with TP or 'safety overflow' valve, water shut-off valve, tank drain valve, pressure-regulating valve, mixing valve and possibly a few other plumbing valves. Vacuum valve implies that a compressor is creating pressure on one line while creating vacuum on another line. I don't know of a water heater that uses air compressor. Open following link to help troubleshoot leaking water heater: http://waterheatertimer.org/Leaking-water-heater.html
Valve is not identified. Cold water shut-off valve, TP valve, check valve, mixing valve, drain valve are the usual suspects associated with electric water heater. Gas water heater has additional valves: gas shut off valve and gas control valve thermostat. Check valve, TP valve and mixing valve probably need replacement. If drain valve is leaking, put garden hose cap over end. Shut off valve probably has a bit of blockage, or is not completely open. Try closing and then opening shut-off valve all the way, and if problem persists, replace or clean out valve.
What kind of noise? Are you sure the noise is from a valve or is it inside the tank caused by sediment build-up inside of tank?
Make sure that the water is not coming from the drain valve, the relief valve or some top fitting and running down the insulation inside the visible outer skin of the heater.
If it is truly a bottom leak, which is common when the heater fails, if the leak is getting on the flame or pilot, you should shut it off. If the water creates an unacceptable situation, for example, leaking on a finished floor, shut the water off.
If the water is leaking slowly and the flame is not being wet down, you can call a plumber and use the tank on an emergency basis.
It sounds like two problems. Problem 1) Clog inside faucet or clog inside pipes at faucet Remove supply tubes leading to faucet and see if problem is inside pipes or inside faucet. My bet is clog inside faucet.
Problem 2) Water heater leak ... you say tank valve is leaking? Is that cold-water shut-off valve? Or tank drain valve? Or TP valve?
If cold water shut-off is leaking, then replace shut off.
If tank drain valve is leaking, then check if plastic valve is cracked. If drain valve is cracked, then replace with a brass valve from Home Depot. If plastic valve breaks off, then use hammer and screwdriver to gently chip out the broken plastic valve. New valve threads need teflon tape to seal pipe. If valve is just dripping, then put garden-hose cap over end of valve and screw down tight.
If TP valve is leaking, then replace with same temperature and pressure rating. New TP valve threads need teflon tape to seal pipe. Problem 3) If pressure is low all over house: Buy pressure gauge at hardware store that screws onto hose connection.
Test pressure on outdoor spigot. Open faucet and check if pressure drops. This says if problem is inside pipes that enter house.
Test pressure on water heater drain valve. This says if pressure problem is before -or- after water heater.
If problem is before the water heater, then shut-off valve located on cold water line is suspect. If problem is after water heater, it could be in hot water outflow pipe on top of water heater, or a nearby elbow. Remove hot water line leading from water heater and check pressure. This says if problem is where hot water leaves tank. Read articles above about clogs inside water lines.
possible problems not knowing age of unit the
control valve could be sticking open allowing gas to continue to flow until high limit is reached and shuts down valve another possible problem with the newer style back flow preventer being install by water companys the rapid heating and expansion of the water over pressures the water system causing releif valve to pop open and reclose most water heater manufacters are recommending instalation of an expansion tank to allow the growth in volume of water somewhere to go is valve constantly leaking or only during heating cycle if you could supply additional information does unit only leak when heating
or is steam expelled when releif valve opens
t-stat not opening gas valve sticking partially open
bad high limit bad pressure releif valve no expansion tank to allow for thermal expansion if steam is present and unit is boiling water inside replacement of water heater for safety concerns,would be reccomended if only water and pops couple of times water temp not over 140 degrees after most hot water has been used out of tank and is reheating most of capacity probably lack of expansion tank as the releif valve is the final safety device on a water heater is of great concern
the temp control gas valve or high limit are supposed to shut unit done long before the safety limit of releif valve is reached
CHECK TO MAKE SURE THE WATER TEMP IS AT THE NORMAL OPERATING RANGE. USUALLY AROUND 120-130 DEGREES. IF IT IS, CHANGE OUT THE PRESSURE RELIEF VALVE. IF THE TEMP IS OUT OF SCALE, CHANGE OUT THE ECO AND TSTAT.
If it is your pop off valve (also known as a temp and pressure valve) it will most likely be due to a over pressure situation, whether it is due to excessive temp, or high street pressure, I'm not sure. There is also usually a vacuum breaker on the cold side of the hot water tank, this will on occasion spit out a little water, but unless it is defective, it should never be so much as that you would notice a "leak".
Another thing, if it is the T & P Valve, there should be no shut off installed on the piping. There should be a pipe that terminates with 18" of the floor, and it is not normal for this valve to discharge unless there is a problem with the temp or the pressure inside the tank.
Hope this helps