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I recently noticed my drip pan had about a half-inch of water in it. I could find no water leaks around the fittings or valves.

The water is slowly evaporating--very dry climate area--and the water in the pan is almost gone.

The heater works well and we have plenty of hot water, could there be an intermittent leak?

  • Do you have an expansion tank (small metal bottle attached to the plumbing near the heater)? What is the temperature setting on the heater? – Tester101 Mar 27 '15 at 0:02
  • No, there is not an expansion bottle. The temp setting is 130 – Zevkat Mar 27 '15 at 0:04
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    Is there a check valve on the main water supply? – Tester101 Mar 27 '15 at 0:11
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    @SomeGuy In cold climates, it's common for the meter to be in the building's basement, to protect it from freezing. It's also possible that the installation predates the requirement for a check valve, and it has not yet been updated to include one. – Tester101 Mar 27 '15 at 1:16
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    Removed the insulating blanket and there was a 4 inch split in the seam about halfway up the side on the back of the unit. It was not leaking water though. Had a plumber check it out and he stated that unit had just rusted thru at that point but he could not explain why it only leaked the one time and still worked. Thanks for all the help from the forum – Zevkat Mar 28 '15 at 2:33
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My thermostat stopped working, my electric water heater got too hot, and water boiled out of the T&P valve. I just had to replace the thermostat. Have it looked at by a plumber. So yes, this can be an intermittent thing.

And yes, there could be a slow leak somewhere else.

What type of WH is it? Gas, electric? Please add this answer to the bottom of your post.

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