There should be a pressure relief valve that prevents any kind of dangerous levels of pressure buildup. The result is that they spill water all over the floor and make a mess but there should never be any kind of high pressure. This is really important because hot water heaters can trigger an extremely violent explosion otherwise.
Hopefully the deformation in your picture was just warping due to heat or something rather than pressure.
There should be a pressure relief valve that prevents any kind of dangerous levels of pressure buildup. The result is that they spill water all over the floor and make a mess but there should never be any kind of high pressure. This is really important because hot water heaters can trigger an extremely violent explosion otherwise.
Hopefully the deformation in your picture was just warping due to heat or something rather than pressure.
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