Thermal expansion tank size.
Posted by John Frim on February 13, 2003 at 01:03:34:
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.


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