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Posted on Aug 16, 2010
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I have an intermittant discharge from the overflow valve. The valve can be operated manually however every now & then there is water coming from the system.

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  • Posted on Aug 16, 2010
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You need to change the t&p valve (temperature and pressure) most of the time this will solve the problem.

have you checked the water pressure?
have you checked the temperature of the water?

more than likely it is just the valve, these are common and can be picked up in any hardware store. be sure to check yours. there are 2 different models, one for a regular water heater, and one for a water heater with 2 inch foam. this one has a little longer stem, but will also work with the regular heater.

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Related Questions:

0helpful
2answers

How do I stop hot water coming out of the overflow pipe. For a week the heater was off. Upon turning the water heater on and after the water was heated it began to run out of the overflow pipe.
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.
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Feb 03, 2019 • Water Water Heaters
1helpful
1answer

How do I fix this problem? Tank is continually filling with water, therefore comes straight out of the overflow pipe - so we get cold water.
most certainly is
if the overflow is connected to a valve externally where there is a small lever that you can over ride the valve and let air/ water out replace that
they are non repairable as they are a safety valve and preset and will be in the vicinity or $90.00 aud to replace
if it is different call a plumber
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May 13, 2016 • Water Water Heaters
0helpful
1answer

Overflow high pressure valve leaking
Replace the relief valve & add an expansion tank.
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Apr 06, 2014 • Rheem 40 GAL ELEC TALL Water Heater 6YR SC...
1helpful
1answer

Rheem 71 30d
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
Read full answer
Oct 10, 2013 • Rheem Tankless Hot Water Heater...
1helpful
1answer

No hot water comes into the house
1) Copy following link:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#no
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Low-hot-water-pressure.html

2) One pipe on top of heater is warm??? >> breaker is ON >>> this indicates that electric water heater has hot water.
When you opened the TP valve, did hot water come out???

3) Feb 2013 >> add a comment.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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Feb 24, 2013 • Rheem 50 GAL ELEC TALL Water Heater 6YR SC...
0helpful
1answer

Wickes 102 combi boiler constantly loosing water pressure
It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

"this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?
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Feb 02, 2013 • Water Heaters
0helpful
1answer

After water is sufficiently heated up, water flow out of the overflow pipe for about 2-3 minutes. Is it normal?
No.
Water should not leak out of water heater.
Water should only come out of the TP valve and down the overflow pipe if water is too hot, or if TP valve is bad, or if you have stacking condition.
http://waterheatertimer.org/How-to-replace-TP-valve.html
http://waterheatertimer.org/Stacking.html
http://waterheatertimer.org/Leaking-water-heater.html
Read full answer
Jul 14, 2011 • Rheem 81VP6S/430126 Water Heater
0helpful
1answer

Water came out on the overflow pipe and kept running.
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.
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Feb 11, 2011 • Rheem 40 Gallon FVR NATGAS Low WATER...
1helpful
1answer

Worcester 350 boiler pressure low - warning light comes on so i top it up with water half an hour later the pressure drops again. Have checked rads and pipes no obvious leaks. Water seems to be coming out...
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
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Oct 15, 2009 • Water Heaters
1helpful
1answer

Hotpoint waterheater leak
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.
Read full answer
Jun 11, 2009 • Water Heaters
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How do I stop hot water coming out of the overflow pipe. For a week the heater was off. Upon turning the water heater on and after the water was heated it began to run out of the overflow pipe.

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