I know that AQUA-HOT systems and the fresh water system are independent of each another. What I want to know is, could the AQUA-HOT system become damaged if the Aqua-Hot breaker is turned on activating the AQUA-HOT when there is no fresh water in the tank?
It will not damage your Aqua-Hot to run it with no fresh water in the fresh water heating loop. You can also run the Aqua-Hot with your system is 'Winterized'.