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The black soot is in the area where burner is. I had left the access panel open and soot was coming out of that door. It makes sense that may be there was not enough air. I live in a townhouse and the water heater is installed in a closet. I used to keep the closet door closed. All other...

He ran couple of tests with a small meter (similar to one used for code reading in cars) and everything was normal.

Hi, I have a Lochinvar natural gas water heater, 40 gallon, appx. 10 years old. It starting throwing out soot for few days and then stopped. I called a plumber who couldn't find any thing. He said that the exhaust vent pipe (that goes to outside) may have been blocked with a bird or something...