The cartridge type block heater is mounted in a bore at the rear of the block (drivers side) under the coolant adapter. The block heater does not directly contact coolant. It heats the aluminum block.
The heater is powered by 110 Volt AC through a power cord and connector. You may have to remove the engine cover (I don't think so) and the Air Cleaner Inlet/Battery Cover and there should be a 110v plug somewhere around there.
Why do you need an engine block heater in AZ?
Are you in Flagstaff or the White Mountains?