I had our hot water heater replaced this morning. It wasn't dead, but it had been acting up ... and it's 22 years old. I'm much happier replacing it before it died instead of going 1 to 2 weeks without hot water if we replace it after it dies.
We had our well pump replaced last April, and the team installed a new water filter. But the unit doesn't have a built-in cut-off switch, and they didn't install one in the line between the pump and the house.
While the plumbers were here, I had them install a switch. So now I turn off the switch on the house side of the pressure tank, turn off the switch between the filter and the house, and swap filters in 30 seconds.
Folks on city/municipal water miss all this type of fun stuff!!!