A no-installation solar shower makes quick rinses outdoors easy—all you need is a hose and some sun. Water in the base of the shower warms up in about an hour and a half to two hours. This heat lasts for around 15 minutes, or seven to eight 2 minute showers. It’s perfect for rinses after a trip to the beach or a dip in the pool. It’s lightweight, portable, and has a removable shower head and adjustable temperature mixer.