Location: Almost any existing shower (except open, walk-in showers) can be converted into a steam shower. If you are building one from scratch, it should be in a bathroom, preferably not against an

Location: Almost any existing shower (except open, walk-in showers) can be converted into a steam shower. If you are building one from scratch, it should be in a bathroom, preferably not against an outside wall. Walls should be well insulated.
Size: The smaller the enclosure, the more efficient it will be. The size of a standard tub-and-shower enclosure is ideal.
Floors and walls: Tile, natural stone or manufactured solid-surfaces are the common choices. Glass fronts are common.
Ceiling: The ceiling, like the floors and walls, must be clad in an impermeable material. Painted drywall, even "wet board," is not acceptable. The ceiling should slope away from the door so hot condensation droplets run down the wall instead of falling on your head. The highest point should be no more than 8 feet to maintain consistent steam at seated body height.
Doors/windows: Special doors that create a seal are required. In a converted standard shower, consider replacing any outside window with glass block.
Bench: Seating options range from built-in mosaic-tiled benches to simple free-standing teak or plastic benches. Prefabricated units have molded seats.
Generator: The generator, about the size of a briefcase, needs its own cold water feed, electrical supply and drain. The generator can be wired to the house's 240-volt electric supply by a licensed electrician. It should be installed within 50 feet of the shower in a vanity, closet, basement, heated attic or even under a built-in seat in the enclosure itself.
Controls: Can be inside or outside the shower enclosure or both. Most have a simple on/off function that brings the enclosure to a preset temperature. Adjustable thermostats are also available.
Water heater: Because the generator takes in cold water and boils it, there is no increased load on a home's standard water heater.
Ventilation: No special ventilation is required, but the bathroom should have an exhaust fan. Turning on the cold water in the shower will allow excess steam to condense.
Operating cost: Pennies per session, depending on the size of the generator.