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Is the outlet it's connected to controlled in any way? It looks to me like a way to auto-shutoff the supply to the heater if a leak is detected.


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It might be a small leak or several very small leaks. I had a leak in my Philadelphia home for years and had no clue. During remodel, I replaced the gas pipes (same appliances), and my gas bill unexpectedly went down by $50 for the summer months. A bubble test will not do. Obtain a real gas leak tester, and thoroughly and methodically test each joint.


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I agree it's a little unclear what the right way is. Why don't you try a test. One evening push all the pins one way, run the hot water for a bit to flush some water, then leave it overnight. In the morning if you still have hot water then the heater was on overnight. If you aren't confidant, repeat the same the next night with the pins the other way.


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I'll agree that it's difficult to tell from the image what in and out are. If you had an ammeter, you could test for current flow to determine if the heater was on or off. You'd wait until the timer says the heater was off, go to the heater and clamp the ammeter on the ungrounded (hot) conductor. If the meter shows a reading, it means the heater is on. ...


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Municipal Water systems require a Pressure Reducing Valve (PRV). It is not recommended to have the house psi above 90. 70 is the norm in most municipal systems. An expansion tank is needed if there is a check valve installed on the in line. If there is a water meter, there is an excellent chance of one being installed. Many water utilities mandate check ...


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A thermocouple makes 30 mv power by a temperature differential across the tip of the thermocouple which contains 2 dissimilar metals. If the entire tip is hot,there is no temperature differential thus no power made or not enough power will be made.A thousand millivolts = 1 volt,so a thermocouple's 30 mv is about 1/33 of 1 volt,a AA battery has 1.5 volts ...


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A thermocouple makes 30 mv power by a temperature differential across the tip of the thermocouple which contains 2 dissimilar metals. If the entire tip is hot,there is no temperature differential thus no power made or not enough power will be made.A thousand millivolts = 1 volt,so a thermocouple's 30 mv is about 1/33 of 1 volt,a AA battery has 1.5 volts ...


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Water heaters have a safety device called a T & P valve, T is Temperature, P is for pressure. it sits atop or near the top of the unit and is designed to "pop off" or open in cases where the temperature or pressure is high.These can go bad by themselves or after being bled by a well meaning or curious person. See if the temperature setting is maxed out, ...



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