Thanks to our fellow residents, I keep learning new things about shutting off the water with a tankless heater. Sorry for so many communiques about this, but this is info you need to know.
Gary has advised residents with tank less water heaters to:
1. Turn the tankless water heater unit off at the electric panel; there should be a dedicated breaker for the tankless water heater unit.
2. Make certain that before restoring the power to your tankless water heater unit that you "bleed" your water system to clear the lines of air when the water to the building has been restored. If this is not done the air will cause the tankless heating elements to overheat and break.
If anybody needs assistance in identifying the correct breaker, please contact Gary!