Our 45 series is a FLOW ACTIVATED water heater however, there is a minimum flow that is needed for the water heater to activate. We now have new updated software for our 45 series's computer board.
Replacing the computer is not as complicated as it seems. We have uploaded a video tutorial to aid in the replacement and to SHOW you the simplest way possible.
If you still have any questions, please feel free to contact us via live chat, email (email@example.com) or give us a call at 1-866-356-1992 (Mon-Fri 9am-8pm PM EST).