Wondering if anyone has experience with a heat exchanger plate like this: 30-Plate 3x8 Water to Water Brazed Plate Heat Exchanger, 3/4" MPT, 316L St Steel | eBay My idea is to remove the heater under the passenger seat in my 80 and hook up one of these to the existing heater hoses. Then I would run lines with quick hose connects with mud covers over them. While camping connect one side to a hose that goes in a bucket of water and the other side to a pump and shower sprayer. Leave them capped when not in use. I am wondering if it would warm up the water enough to have a decent shower. Seems like that would be a good spot for an exchanger once the heater is gone.