220v outlets

I've ordered my first Tesla (MY) and in preparation for its delivery I'm debating on whether or not this charging solution I have in my mind is... just crazy or actually feasible? We're lucky enough to only live 1.5 miles away from a bank of gen 3 super chargers set to go live any week now so...

I've got a friend who is looking at a M3 and doesn't have any affordable/easy way to add 220V charging in his garage. His water heater is in the garage and is set to run on a timer. Charging 110V is out of the question since his commute is about 75 miles. What do you guys think of the idea of...