[Pushit2.0]

Most houses are wired for 220v @100amps, so if you run power to your garage off the house I would only do 50amps, Talk with an elctrician but the idea is to not have more amps in breakers then your service is rated for, but we all know how that goes. I have 220v @ 50amps to my garage, runs my Husky compressor, lights, MIG welder (when I had one) and the heater just fine. Having 220v power is nice, you lower your amps needed with higher voltage. On the floor heat, its not needed but if you are looking at resale value then go for it, I could not justify spending that much. I bought my heater from an industrial place for ~$500 and works great with insulation, even befor I insulated my attic was 90deg and the floor was 50deg. Now with a small box fan on low to move air its a constant 65deg or higher if I want. Also an electric thermostat that you can program to come one only when you need it will help the energy bill a lot.

~John