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The water heater is likely the least of the issues. Changing the cold inlet and hot outlet, as well as the black iron gas supply are no big deal. The question is whether or not the unit can still be properly vented. There are limitations on the length of flue while maintaining proper pitch. Exceed them and you can have CO discharge into the dwelling or stratification of gases in the chimney, acidic condensation formation, and flue deterioration.
Moving the furnace carries these issues, also. In addition, as observed above, the lineset can be extended, but I do my best to avoid the practice. You still must provide for a means of condensate drainage from the evaporator, and the system will need to be rebalanced to provide proper discharge and return flows. You can't just hook up the ductwork and assume it to be smooth and groovy.
Have your proposed plans evaluated by a qualified mechanical contractor to ensure that the system will function in a safe and efficient manner.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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