What to do before the shtf is to buy spare parts. For instance my diesel Yamaha generator has an automatic voltage regulator, if that goes it’s dead. I bought one off amazon. We’ll have hot water as long as my gen runs. It’s grounded with a 8 foot pole and has a steel cabinet. Emp proof who knows. If I have to bug out it will sit nicely in my diesel pickup bed next to a 100 gal transfer tank. Another idea I had was to buy a new 100 gal aluminum tank just for short term water storage. Showers and power, the two necessities.