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Expect to spend roughly $0.50 to $1 on water and electricity for a 20- to 30-minute steam session. Actual costs depend on your local utility rates, but most homeowners find that the increase on their monthly bill is modest, even with regular use. To keep ongoing costs down, look for an energy-efficient generator and ensure your shower is properly sealed to prevent heat loss.

Flush the generator regularly to remove mineral buildup and maintain a steady steam flow. Most models have a drain valve or button—hit it after each session or as the manufacturer recommends. Skipping this essential maintenance step can trigger safety shut-offs or shorten the lifespan of your steam shower.

It’s not uncommon for homeowners to discover mold in their steam showers. Steam equals humidity, and humidity invites mold. Run the bathroom fan during and after each session, crack the door to allow air circulation, and wipe down the walls frequently. If you spot mold, spray undiluted white vinegar, wait an hour, then scrub—it’s an easy, chemical-free fix.