It may be a very long run.
A friend of ours visited Israel and found that the water heater was on the roof and used some solar to keep the water hot. It also had to be turned on and off when it was going to be needed. She wasn’t told about that before the morning of her first shower. She found out the hard way.
Global Warming will make all the water always hot.
Until then, I have a stove to make tea.