I've got one of the Ebay $200.00 ones installed permantly in a bush barn and it works great. Had it now for two years. The biggest drama is having the right sized pump to run it. If you by too big a pump the heater can't handle the flow and does not get hot enough or if you turn down the water control valve on the unit it causes the pump to "Chatter". My kids shower straight out of a shower head, but I prefer to fill a canvass bucket from the heater and shower under that. the pressure out of the unit is not excellent. For two hundred its worth a try.

