Use a wood chisel (~1 inch) along the seam to break loose the clear cover. The cover snaps into place but may be lightly glued.

Pull out the internals. You will need to push in the on/off switch at bottom of unit to get the insides to slide out.

Detach tank. Note location of wiring if you are going to reassemble unit.

Pull off top of tank.

Pull heater unit out of steel sleeve.

Remove flat wick from heater

Observe basket style heater unit. Resistance readings: blk-grn: 1.1 ohms; blk-red: 1.1 ohms; red-grn: 2.2 ohms

Unsnap the circuit board from the L-shaped plastic holder.

View board.

The lip piece can be unsnapped from the inside, pulled out from the top and disassembled as shown.