Quote:
Originally Posted by Brad-tv
Sounding hollow is ok but that’s only the first test.
The next step is to take a tire gauge and check the pressure in the tank and make sure it’s close to your house pressure. If the pressure is low or zero the tank needs to be replaced. There is a valve at the top of the tank underneath a cap and you can check the pressure.
If the tank is mounted so close to the ceiling that you can’t get the tire gauge on it then you can’t accurately determine if the tank is functional.
I have seen many hollow sounding tanks that had little or no pressure in them.
I have seen only a small percentage of tanks that tested good after 5 years. Keep in mind if the tank fails (and it will eventually )it can cause damage to your hot water tank, damage to your valves in plumbing fixtures, joints in supply pipes and major leaks.
Check those tanks and replace them if there old!!
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One of my homes has a 21 year old HW heater.
Never had an expansion tank.
Never had any issues you speak of in 21 years.