Overflow high pressure valve leaking

Without knowing the make and model of the water heater, the overflow pipe would be assumed to be a pressure relief valve. There should be no water coming out of this unless the pressure in the system is too high, the valve is bad or it has been activated and wont seal.

The valves are the same specs. Is it possible that a new valve leaks, yew. However if both valve leak then there are other problems. Does the valve only leak when hot water is called for? Then check temperature setting on heater. Does it lek all the time? The water pressure is to high ,

• Maximum Temperature Setting (Deg. F): 210
• Maximum Pressure Setting (psi): 150

Why the relief valve at the water heater is leaking and what to do about it

Does tankless water heater require pressure relief valve

Pressure relief valves open on high temperature as well as high pressure. They do go bad and are replaceable.

Consider calling the plumber. It is not very expensive part and the plumber can change it quickly.

If you just want to do it yourself:

1. Write down the make and model of the water heater.
2. Go to a real plumbing store and buy a new one.
3. Turn off the heat source (the gas or electricity)
4. Turn off the water inlet and open a hot water valve at any sink to take the pressure off the heater.
5. Remove the old relief valve. It may take a long handled wrench.
6. Install the new pressure relief.
7. Close the sink valve.
8. Turn on the water and check for leaks.
9. Turn on the heat source.

Good luck.

over heating possible bad gas control valve , relief valve bad or water pressure too high or overheating will cause it to leak also lack of thermal expansion tank

The releif valve will open if the water gets to hot to discharge hot water out or the relief valve is gone bad and needs to be replaced. the relief vlave protects the heater from high heat and build up of pressure from it over heating.

Hot water pressure relief valves serve two functions. The first is to remove high-pressure water from the hot water tank. The second function is to act as a high temperature valve to remove water that exceeds a predetermined point for the valve. Both of these relief settings are preset at the valve factory. Many pressure relief valves will come with a metal tag that identifies these release points. If you're attempting to remove the hot water heater pressure relief valve, pay careful attention to ensure that you replace with the correct valve.

Your hot water heater has a pressure relief valve safety mechanism. When pressure inside the water tank exceeds certain limitations, the valve opens up to allow the pressure to be released. A faulty pressure relief valve will not release excess pressure, which could cause extensive damage to your home. You should test the hot water heater pressure relief valve once every six months to ensure proper operation. If the pressure relief valve fails the test, replace the valve with a new one immediately

Locate the pressure relief valve on your hot water heater. The pressure relief valve has a lever handle on top with a drain pipe attached to it. The pressure relief valve is most often on the side of the water tank toward the top. Newer models of hot water heaters have the pressure relief valve on top of the water tank.

Inspect the area around the pressure relief valve for signs of leaking water. If there is leaking water near the relief valve connection, replace the relief valve. If no leaking is evident, proceed with testing the pressure valve.

3

Examine the area below the pressure relief valve drain pipe. Most water heater closets either have a drain in the floor below the pipe or the pipe is inserted into another pipe to direct the water out of the home. If the end of your drain pipe is not in another pipe or there is no drain in the floor, place a bucket under the drain pipe to catch water when you test the pressure relief valve.

4

Pull the lever handle on the top of the pressure relief valve up with your fingers. A working lever will lift up without difficulty.You should begin to hear water going through the drain pipe. Slowly release the lever to shut off the pressure relief valve. The pressure relief valve is good. If you did not hear water running through the drain pipe, lower the lever on the pressure relief valve and replace the valve. If the lever is difficult to raise, do not force the lever. Replace the pressure relief valve.

Now with all that said if you have a closed loop water supply system and you have a pressure vessal/expantion tank it may have gone bad and is making the TP valve leak. you can call your water provider to see if you have closed loop system.

This is not an "overflow". It is a Temperature/pressure relief valve. Sometimes they leak with age or build up solids in valve preventing them from closing completely. This is the single most important safety device on your water heater. If one of the thermostats is malfunctioning, the TPR valve will relieve. If the pressure rises too high, it will also relieve. You can replace the valve, but be sure it is the same temperature and pressure rating. You will need to turn the water off and drain some of the water prior to removing the valve. Don't forget to reinstall the down pipe that directs floor to floor or drain. If a new one leaks also, suspect your temperature control. Water heaters can be bombs if the safeties are not working properly

sounds like your pressure relief is leaking. Make sure your home water pressure isn't abnormally high (above 80 psi). As long as your water pressure is fine, you should replace the pressure relief.

Whining = pump bearings
Pressure reduction = pressure relief valve diaphragm either perished of gunged up - look for water coming out of the overflow pipe from the valve
leak in ch system look at all joints

That overflow is the Pressure Relief Valve.usually they are set at 3-3.5 bar but over time they can be gunged up inside and leak/allow water to flow out. Dismantle & clean or replace. Turn off mains water and ch pipes before removing - operate valve remove & allow for some water to leak from it