Re: Thermal expansion tank size.
Posted by hj on February 13, 2003 at 07:54:55:
In response to Re: Thermal expansion tank size.
In a water system, since water is essentially noncompressible, a miniscule amount of expansion will create a large pressure change, almost any volume of retained air will absorb the expansion.

: I have read several messages discussing the use of a thermal expansion tank on domestic hot water systems supplied from a pressure regulator or a back flow preventer. Is there a way of determining the volumetric size of the expansion tank? Is it based on the volume of the hot water tank (mine is 50 gal), or the hysteresis of the thermostat controlling the temperature? My guess is that both are involved, but perhaps there is a simple rule of thumb that is used. Thanks for the help.

: JF

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