hissing water heater

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    • #274226
      Anonymous

      our hot water heater is hissing, just like when a pot of water is boiling over, and little droplets of water are hitting the stove elements. The sound seems to be coming from the base of the heater, yet, when I remove the plate by the pilot lite, there is no water evident. And with this occurance we only seem to have luke warm water now… Any ideas? And while attempting to trace this problem, I also noticed a noise coming from our toilet, like air escaping? Could this be related? We only bought the house 4 months ago and do not know the house or its characteristics all that well as yet. The house is an older house, but the hot water heater is fairly new. It is also natural gas. And winter is setting in. Any chance of cold weather imposing this issue? We are on city water and our pipes run under the house in the crawl space. Although there is also a furnace down there, so the area stays pretty warm… Any recommendations, suggestions or ideas would be greatly appreciated!

    • #289399

      Get the attention of the occupants to tell them you are going to make a test of the water system, so they do not rush everywhere to open every tap in the house, but remain away from the taps.

      Close the main water valve to the house. Open the highest tap in the house. When the water heater gas shuts off because the tank has made enough water, listen everywhere for the hissing sound.
      If the hissing sound is not there, the water pressure is not forcing water through a restricted space making a hissing sound. Turn the water back on and close the top tap. Listen for the hissing sound. If the sound comes back while the gas burner to the water heater is off, listen for ites location. Isolate the sounds in this manner.

      When the water heater burner comes on and you hear a hiss, it may then be steam being made in dirt inside the water heater. If this is the cause, flushing the bottom of the water heater might help, or might not. If you can’t find the cause of these problems, call an experienced plumber.

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