Short answer
No, most home saunas do not need a drain. Infrared cabins use no water, and Sunlighten says not to put plumbing in the sauna. A traditional sauna only uses a ladle of water on the stones, though Harvia recommends a floor drain in new construction, especially for commercial saunas. Steam rooms are different: MrSteam says they need a floor drain.
A drain is one of the first questions when planning a home sauna. The answer depends on the type: infrared, traditional, outdoor or steam. Here is what the manufacturers say, plus how to clean a sauna that has no drain.
Do you need a drain? Quick answer by type
| Type | Drain needed? | Why |
|---|---|---|
| Infrared cabin | No | Dry heat, no water. Sunlighten: no plumbing in the sauna. Clearlight: no spraying water when cleaning. |
| Traditional home sauna | Not required | Only a little water on the stones. Harvia recommends a floor drain in new construction. |
| Commercial sauna | Strongly recommended | Harvia: a floor drain helps with sanitary cleaning and maintenance, especially in commercial saunas. |
| Outdoor barrel sauna | No plumbed drain | Almost Heaven barrels have a bottom drain stave with drainage holes. |
| Steam room or steam shower | Yes | MrSteam: include a floor drain; the generator also needs a water line and a drain line. |
Why a traditional sauna does not need a drain
In a traditional sauna you ladle a little water onto the hot stones to make steam. That water evaporates. Harvia says to use only clean tap water on the stones and to empty the bucket after every use, and Almost Heaven warns not to throw excessive amounts of water on the stones. So there is no standing water that needs a drain.
Harvia still recommends a floor drain in new construction, especially in commercial saunas, for sanitary cleaning and maintenance. If you are building a new room anyway, a drain makes washing the floor easier. For a kit in an existing room, it is optional.
Choose a floor you can clean
A good floor matters more than a drain. Harvia strongly recommends a floor that can be easily cleaned, such as concrete, ceramic tile or a poured floor. It says carpet is not recommended, because it becomes a breeding ground for bacteria in the moist sauna and helps spread foot infections such as athlete’s foot. For the same reasons, Harvia does not recommend wooden duckboards as flooring.
Harvia’s maintenance instructions say to wash a waterproof floor with a disinfectant about once a week or as often as needed, and to hose off removable flooring to clean it.
Infrared saunas: no drain and no plumbing
Infrared saunas heat with panels and use no water. Sunlighten tells owners not to place plumbing or plumbing fixtures in the sauna and to keep all liquids away from the heating panels and electronics. Clearlight says its saunas need minimal cleaning, recommends a damp cloth, and does not allow steam cleaners, pressure washers or spraying water. Clearlight also says not to use its sauna near water, for example near a bathtub, in a wet basement or near a pool.
Power matters more than plumbing here. Many infrared cabins plug into a standard 120 V outlet, but not all: Clearlight’s models range from 120 V and 15 amps to 240 V and 30 amps. Check your model before you choose the room.
Outdoor saunas: let water drain away
Outdoor saunas do not need a plumbed drain, but rain and meltwater must not collect under them. Almost Heaven builds its barrel saunas with a drain stave, the bottom board, which has one or more drainage holes. It asks for a firm, level surface that can carry the sauna and its users (1,000+ lbs), such as a deck or concrete slab.
For infrared cabins outside, Sunlighten says there must be adequate drainage so water cannot pool around the base, and Clearlight‘s outdoor warranty requires a flat, level, hard surface with adequate drainage. See can an infrared sauna go outside and putting a sauna in your backyard.
Steam rooms are the exception
A steam room fills with steam that condenses on the walls, so it needs a drain. MrSteam says the walls and ceiling must be water-resistant and non-porous (such as tile, stone or acrylic), the ceiling should be sloped to control condensation, and you need to include a floor drain. Its project guide lists a water line to the steam generator, a steam line to the shower and a drain line. MrSteam also recommends flushing the generator tank about every two months, more often with hard water.
If you are torn between the two, see infrared sauna vs steam room and can you use your shower as a sauna.
Do you need a shower nearby?
It is not required, but it is handy for rinsing off before and after a session. If you put in a shower, keep it away from the sauna electrics: Harvia says the control panel and power unit must be in a dry place away from a spa, pool or shower. See shower before or after the sauna and where to put a sauna in your home.
How to keep a sauna clean without a drain
- Rinse off before you go in and sit on a towel. Harvia says each bather should sit or lie on a towel for hygiene.
- Scrub the benches with a soft brush and soap and water, or a mild disinfectant, when needed. Harvia suggests about once a week in commercial saunas.
- Wash or mop the floor, and take removable floor mats out to hose them off, as Harvia suggests.
- Empty the water bucket after every use.
- Leave the door or drying vent open after use so the room dries out.
- More tips: how to clean a sauna and how to prevent mold in a sauna.
What a sauna does need: power and ventilation
Traditional heaters such as Harvia’s KIP series must be hard-wired by a licensed electrician to 240 V single-phase or 208 V three-phase, with no plug. A traditional sauna also needs ventilation; see do saunas need to be vented. Traditional saunas usually run at about 150 to 195°F and infrared saunas at about 110 to 135°F, according to Cleveland Clinic.
Frequently asked questions
Does a home sauna need a drain?
No. Neither infrared nor traditional home saunas use enough water to require one. Harvia recommends a floor drain in new construction, especially in commercial saunas, because it makes cleaning easier.
Does an infrared sauna need a drain?
No. Infrared saunas use dry heat and no water. Sunlighten says not to place plumbing or plumbing fixtures in its sauna, and Clearlight says not to clean its saunas with steam cleaners, pressure washers or spraying water.
Does a steam room need a drain?
Yes. MrSteam says a steam shower needs a floor drain, waterproof walls, a sloped ceiling and a water line and drain line for the steam generator.
Do outdoor saunas need a drain?
Not a plumbed one, but water must be able to drain away. Almost Heaven barrel saunas have a bottom drain stave with drainage holes, and Sunlighten says an outdoor sauna needs adequate drainage so water cannot pool around the base.
Do you need plumbing for a sauna?
No. A sauna needs power, not plumbing. A shower nearby is useful for rinsing off before and after, but that is plumbing for the shower, not the sauna.
What floor is best for a sauna without a drain?
Harvia recommends a floor that is easy to clean, such as concrete, ceramic tile or a poured floor, and says carpet and wooden duckboards are not recommended. For infrared cabins, follow the maker: Sunlighten allows tile, concrete, carpet, laminate or wood.
Sources
- Harvia: KIP sauna heater owner’s manual (floor drain, flooring, maintenance, wiring)
- Sunlighten: Amplify owner’s manual (no plumbing, outdoor drainage, surfaces)
- Clearlight: Sanctuary 5 owner’s manual (cleaning, water warning, outdoor warranty)
- Clearlight: Electrical requirements for your infrared sauna
- Almost Heaven: Barrel sauna instruction manual (drain stave, foundation)
- MrSteam: Steam shower construction FAQ (floor drain, waterproofing)
- MrSteam: Plan your steam shower project (water, steam and drain lines)
- Cleveland Clinic: Infrared sauna benefits and precautions (temperatures)
This guide is based on the linked manufacturer manuals and public sources, checked on October 20, 2026. We did not test products ourselves. Always follow the manual for your model and your local building code.