Yes, you can use tap water in most clothing steamers. Many manufacturers, including Rowenta, design their steamers to work with regular untreated tap water. The catch is that tap water contains dissolved minerals, and over time those minerals build up inside the steamer as a chalky residue called limescale. How fast that happens depends almost entirely on how hard your water is.
Why Tap Water Causes Problems Over Time
When water heats up and turns to steam, the minerals stay behind. They coat the inside of the heating element, the water tank, and the steam vents. This buildup, called scale, gradually narrows the pathways that steam travels through. When those pathways get partially blocked, steam pressure builds unevenly and forces hot water out along with the vapor. That’s what causes the spitting, sputtering, and water spots that steamer owners commonly complain about.
Scale also makes your steamer work harder. In boiler systems, just 1/8 inch of scale reduces heat transfer efficiency by up to 12%. A clothing steamer is a much smaller appliance, so it doesn’t take much buildup to noticeably reduce steam output or slow heating time. Over months or years, heavy scale can shorten the appliance’s lifespan entirely.
How Hard Your Water Matters
Not all tap water is created equal. Water hardness is measured in milligrams per liter (mg/L) or grains per gallon, and it varies dramatically by location. Here’s the standard classification:
- Soft (0–60 mg/L): minimal mineral content, safe for steamers with little maintenance
- Moderately hard (61–120 mg/L): some scaling over time, periodic descaling recommended
- Hard (121–300 mg/L): noticeable buildup, more frequent cleaning needed
- Very hard (over 300 mg/L): rapid scaling, consider switching water types
If your water exceeds about 85 mg/L (roughly 5 grains per gallon), you’ll want to take steps to reduce mineral exposure. You can check your local water hardness through your municipal water supplier’s annual quality report, which is usually available online. If you’re on well water, a home test kit will give you a quick reading.
What Water to Use Instead
Distilled water is the best option for minimizing mineral deposits, since the distillation process removes virtually all dissolved minerals. Demineralized water works similarly. Either one will keep your steamer’s internals cleaner for longer.
If you’d rather not buy distilled water regularly, Rowenta recommends a 50/50 mix of tap water and distilled water for hard water areas. This cuts the mineral load in half and is a reasonable middle ground between convenience and appliance care.
One important note: not all “pure” water is good for your steamer. Rowenta specifically warns against using scented water, softened water, water from clothes dryers, refrigerators, or air conditioners, boiled water, filtered water, bottled water, and rainwater. Some of these contain organic compounds or chemicals that can cause brown staining or premature wear. Regular filtered water from a pitcher, for example, removes chlorine and some contaminants but leaves most of the minerals that cause scaling.
How to Descale a Steamer
Even with careful water choices, some mineral buildup is inevitable if you use tap water at all. Descaling every few weeks (or whenever you notice reduced steam output) keeps things running smoothly.
The standard method uses white vinegar mixed with distilled water in a 2:1 ratio, so two parts water to one part vinegar. Don’t use apple cider vinegar or flavored varieties, as they can leave residue in the tank. Here’s the process:
- Empty and cool: Unplug the steamer, let it cool completely, and empty the reservoir.
- Fill with cleaning solution: Pour the vinegar and water mixture into the tank.
- Heat and flush: Plug in the steamer, turn it on, and let it heat. Then discharge the solution through the nozzle so it cleans the internal pathways.
- Soak if needed: For heavy buildup, let the solution sit in the tank for about 30 minutes before flushing.
- Rinse: Drain the cleaning solution, then refill with distilled water (or a 50/50 mix). Run about half of it through the steamer to flush any remaining vinegar, then empty and let the appliance cool fully.
You’ll know it’s time to descale when the steamer starts spitting water droplets, producing less steam than usual, or leaving white or brown spots on fabric.
The Practical Bottom Line
If you live in a soft water area, tap water is perfectly fine for your steamer with occasional descaling. If your water is moderately hard, a 50/50 mix with distilled water and monthly descaling will keep things running well. If your water is hard or very hard, switching to distilled water is the most cost-effective move in the long run, since it’s cheaper than replacing a steamer that’s scaled shut. A gallon of distilled water costs less than a dollar at most grocery stores and lasts through many steaming sessions.