There are quite a few houses with 100 amp services that were made in the late 70's. That's pushing it. But a 150 Amp is only about 60 bucks if you look around. Also, if you want more than one of these beasts, a 300 amp may be a good idea. But that's a bit more money. Still a pittance by comparison to the miners themselves.
My house is all electric with 100amp service, but I was making the comparison between the stated spec and actual spec. If they had the power to run the machine on 120v then the actual machine usage difference on 240v isn't going to make a difference.
The biggest problem with 70s houses is aluminum wire. Even if I could run a machine on 120v, I would have a dedicated circuit installed anyway. That aluminum wire is a fire hazard.