Why is there a knocking noise coming from my natural gas hot water heater?

by Water Heaters on August 19, 2010

It is 9 years old. Does that mean it’s time for a new one? Thank you in advance.


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    { 4 comments… read them below or add one }

    alvarz August 19, 2010 at 9:38 am

    you have a mineral build up at the bottom of the tank. When it gets to this stage the next thing is the tank will wear a hole in the bottom and start to leak. So from my experience working as a plumber I would advise you to replace the tank.

    diva2456 August 19, 2010 at 9:38 am

    I just had the same thing and had the repairman out. He said that there is sediment in there. He told me to try and drain it and see if I can get some out, but sometimes when you release the drain valve you have to cap it off or it will leak all the time. I haven’t done it yet because it sounds like a pain. If it doesn’t work he told me that it’s time for a new one.

    FormerFarmBoy August 19, 2010 at 9:38 am

    Yes. I would start watching for one to go on sale. 9 years is a good life span for a heater. It is usually better to replace it on your scheduled time rather than on it’s schedule. It would probably last for a long time, longer than if it was an electric. You are losing efficiency, it takes more energy to heat the mineral deposits and the water than just the water. Most likely the sediment is solid chunks on minerals, mostly calcium, and you will not be able to flush them out by draining.

    It isn’t too difficult of a job, but it can be a pain. Just buy everything you might need in advance and then return what you don’t use.

    Good Luck,

    Jason

    Streetglide August 19, 2010 at 9:38 am

    It means you have sedimentary build up most likely, you have a drain valve near the bottom of the unit that has a hose attachment, connect a hose to go away from you and drain the sediment. A few gallons a year should be drained from the tank

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