simsy its pretty handy when you have travelled across 1000km's of red dirt and you drive a softtop... you end up looking like a freshly pulled potato...
i thought you guys were talking about the type that runs off your heater hose, thats the type i have, runs a 12v motor and has a heat exchanger plumbed into the heater hose, i have a switch under my bonnet and the shower head clipped under there too... you adjust the temp with the heater dial in the car... very bloody handy, good for washing up too...