If the flow sensor is installed and you have a power outage, HUGO will stay in standby mode until the flow sensor receives a water flow signal. At that time, HUGO will start converting DC
to AC and allow your tankless to power up. When you're done using water and shut off all the taps, HUGO will stop sending power to your tankless after 5 minutes to preserve the battery for prolonged actual use of hot water. If your typical hot water use is one hour per day the HUGO deep cycle battery can provide adequate power for 3-7 days of regular operation (depending on the actual power consumption of your particular tankless water heater).