I have a 220 warehouse type heater already hooked up in my garage, I going to move it and I want to hook a wall on/off switch to operate it behind my bar (oh you my garage is a full bar :) ) is this possible and can you tell me how the wire configuration would be, box to switch,switch to unit? Thanks

"220" is all well and good. You'll need a 2-pole switch.
That's only half the information we need though.
What is the amperage or wattage of this bad boy??