Yeah, Inefficient and expensive... about $80 for the cheapest ones...
I use 14-3-G NMB Cable for vent and light and use a 12-2-G NMB Cable on a dedicated circuit for the heater. I recommend a timer/switch for the heater to reduce the chance of an outrageous electric bill.
-Virgil Residential/Commercial Inspector 5 Star Inspections Member IAEI
