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Protect Water Heating Systems with Expansion TanksWater has a tendency to expand when it is heated and it becomes nearly incompressible. These two things create a powerful force in a water heater. For example, the water in a standard 80-gallon storage tank may expand by as much as 2.5 gallons as it is heated, and this thermal expansion will cause a significant increase in the pressure in the plumbing system unless the extra fluid volume is adjusted.Bell & Gossett Potable Water Diaphrag …