Roger W. Norman wrote:

Yes there is. All water heaters have an active electrical connection
because no water heater would heat water without it.

I beg to differ based on experiences several years ago taking a hot
shower in a pitch dark house that had been without electricity for
3 days. I developed a little ritual that involved using the flash
light to get to the shower, then showering in total darkness, then
turning on the flashlight again once I was done.

- Logan