In this case, it could be that your water system suffers from an intermittent or periodic increase in pressure. If your water pressure is closer 80 PSI, your relief valve can still be releasing water. Testing for intermittent pressure increase But if it’s more than 80 PSI, then you’ve got a problem. If the pressure is less than 80 PSI, it’s all well and good. Double-check the reading by attaching the pressure gauge to another hose bib and test the water pressure there. Normal water pressure falls between 40-80 PSI with no other taps running. The cold or hot water tap in the laundry room is a good place to start. Once you have the pressure gauge, simply attach it to a hose bib around the house. These are usually accurate enough for our purposes here. To do this, simply go to your local plumbing store and buy a threaded pressure gauge. Using a water pressure gauge is a simple method of determining whether excessive pressure is causing the relief valve to discharge water. Excessive Pressure Using a water pressure gauge If your water temperature is 210 ☏ or higher, then it’s likely that your relief valve is discharging water due to the water overheating.īut if the water temperature is below 210 ☏, then there might probably be a problem with the water pressure or the relief valve itself. To do this, simply let the heater run and open a hot water tap anywhere in the house for a good 2 to 3 minutes.Īfter this, place a thermometer in the running water for 10 to 20 seconds and read the temperature. The very first test you should be doing is of the water temperature. Excessive Temperature Testing the temperature with a thermometer Here are some of the ways you can test what’s causing the relief valve to discharge water:ĭiagnosing the cause of relief valve leakĪs we mentioned earlier, there can be three reasons for this. In that case, you will need to replace the relief valve completely, Sometimes, there’s a third reason why water discharges from the relief valve, and that is that if your relief valve is faulty or not properly sealed. When either of these takes place, the relief valve is activated, and the excess hot water flows out the relief valve.īut this is not always the case. This purpose of the relief valve is to discharge water in two cases: Most standard indoor water heaters have a relief valve. Reasons why a heater’s relief valve discharges water How do you fix a leaking temperature and pressure relief valve?.
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How to know if your pressure relief valve is faulty?.Why does my expansion tank keep filling up with water?.Why does the relief valve overflow when discharging water?.Testing for intermittent pressure increase.Testing the temperature with a thermometer.Diagnosing the cause of relief valve leak.Reasons why a heater’s relief valve discharges water.
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