Wenzel Solar Shower Clean up while camping in the great outdoors with the Wenzel solar shower. Ideal for overnight hikes, road trips, music festivals, and any other grime-building activity, the solar shower heats up to 5 gallons of water at a time, so you can take a warm, relaxing shower without renting a hotel room. 5 gallon capacity. Water-tight design. Spray nozzle with on/off hose fitting. Heavy duty PVC material with reinforced handle.