Just a note, electrical fires are the number one cause of boat fires. Not fuel, not propane, not the galley...... electrical.
If you are going to live aboard for any length of time, but do have frequent access to a marina, then I would use an electric tank heater that also heated off the engine coolant. You either run a genset when at anchor or the engine to top the batts anyway, so it will make hot water then.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.