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This siphon effect relies on atmospheric pressure to allow the pressure and pressure potential energy to drop as the water travels upward inside the sealed pipe. But eventually the pressure of the rising water reaches zero and no further reductions in pressure and pressure potential energy are possible.
So, for reasons of safety, most plumbing codes require both residential and commercial plumbing systems have ways to accommodate water heater thermal expansion. WARNING: When water heater thermal expansion creates dangerously high water pressure, it can cause the top or bottom of the tank to bulge or rupture. A distorted water heater is quite dangerous and needs to be replaced.