Commercial Steam Room Design Guide for Hotels & Spas

A commercial steam room is one of the most powerful wellness amenities a hotel, spa, or health club can offer. Done right, it drives guest satisfaction, repeat visits, and membership retention. Done wrong, it generates callbacks, maintenance headaches, and unhappy guests. This guide covers everything you need to plan, spec, and operate a commercial steam room — generator selection, sizing, materials, drainage, ADA compliance, and long-term maintenance — with specific guidance for the brands we carry at TheSteamStore.com.

TheSteamStore.com is an authorized dealer of ThermaSol, Mr. Steam, and Amerec. Browse our full commercial steam collection or contact our team for help speccing the right system for your property.

How a commercial steam room differs from residential

The core technology is the same — an electric steam generator heats water to boiling point and pumps steam into a sealed room. But commercial steam rooms differ from residential installations in several important ways:

• Higher capacity generators — commercial rooms are typically larger and serve more simultaneous users, requiring larger, more powerful generators built for continuous daily operation
• Continuous duty cycles — a residential generator may run for 20–30 minutes once or twice a day. A hotel or health club steam room may run for 8–12 hours continuously. Generators must be rated and built for this load
• More demanding maintenance requirements — daily heavy use means more mineral scale buildup, more wear on heating elements, and a greater need for automated cleaning systems and serviceable components
• ADA compliance — commercial steam rooms open to the public must meet Americans with Disabilities Act requirements for accessible design
• Three-phase power — most commercial buildings have three-phase power available, which commercial generators are designed to use
• Professional design — traffic flow, bench capacity, drainage, ventilation, and signage all require careful planning in a commercial context

Sizing a commercial steam room generator

Commercial steam rooms are sized the same way as residential — by the cubic footage of the room (length × width × height). The key differences in commercial sizing are the ceiling height, wall materials, and the need to account for door gaps and ventilation in larger spaces. For commercial applications, always size up from the calculated cubic footage to ensure adequate capacity under continuous load.

Commercial generator options: ThermaSol, Amerec, and Mr. Steam

TheSteamStore.com carries commercial-grade steam generators from three brands. Each covers different capacity ranges and suits different types of commercial projects.

ThermaSol PowerPak Series III

The ThermaSol PowerPak Series III is ThermaSol's commercial generator, designed for health clubs, resorts, spas, and any high-use commercial environment. Two models are available:

• PP18SR — 18kW — for commercial steam rooms up to 1,000 cubic feet. Available in 208/240V and 480V three-phase configurations
• PP24LR — 24kW — for commercial steam rooms greater than 1,000 cubic feet. Available in 208/240V and 480V three-phase configurations

The PowerPak Series III is delivered fully assembled and features an industrial-grade stainless steel tank, Incoloy heating elements for superior corrosion resistance, a split tank design that separates the heating function from the water feed for enhanced efficiency and longevity, PowerFlush automated inner-tank cleaning, CAN Bus digital communication, and front and top panel access for easy servicing. The unit can be installed up to 50 feet from the steam room and does not require a separate drain line — it uses the steam room's existing drain. Dimensions are 19"L × 18"W × 32"H. Backed by ThermaSol's 18-month parts and labor commercial warranty. Browse the ThermaSol commercial steam collection.

Amerec AK Series — gangable for commercial capacity

The Amerec AK Series is a residential and light commercial generator line that can be ganged together in configurations of up to three units to cover rooms up to 1,500 cubic feet. The largest single configuration — the AK36 (two 11kW units + one 14kW unit, totaling 36kW) — covers rooms from 1,200 to 1,500 cubic feet. One control is required regardless of how many generators are ganged, and each generator requires its own ComfortFlo steamhead. The AK Series uses Sequential Temperature Control, stainless steel tanks, removable heating elements, and is UL, CSA, and CE listed. Available in 240V or 208V, field-wireable for single-phase or three-phase configurations. Browse the full Amerec generator lineup.

Mr. Steam CX Series commercial generators

Mr. Steam's CX Series generators are purpose-built for continuous commercial use in health clubs, spas, hotels, and resorts — covering a wide range of room sizes with higher-capacity output than the residential MS Series. The CX is an atmospheric generator — quieter than pressurized systems — with a built-in internal temperature shutoff to prevent low water conditions, an integral high water cutoff feature, and a programmed preheat function that brings the steam room to temperature at the start of each day. Mr. Steam CX systems are installed at Canyon Ranch, The Ritz-Carlton, Bellagio, MGM Grand, and facilities across the US. Browse the Mr. Steam commercial collection.

Room design and materials

The materials and construction of a commercial steam room directly affect both the guest experience and the long-term maintenance burden. Here is what to consider:

Wall and floor materials. Non-porous surfaces are strongly preferred — porcelain tile, ceramic tile, and glass tile are the most practical for commercial use. They are easy to clean, resist mold and mildew, and do not absorb heat or steam. Natural stone (marble, granite, travertine) is popular in luxury spa environments but is porous and requires sealing, more aggressive cleaning protocols, and larger generators for brands that apply a material multiplier in their sizing formula.

Ceiling slope. The ceiling must slope a minimum of 2 inches per foot toward one wall to drain condensation. This is non-negotiable — a flat ceiling causes condensation to pool and drip cold water on bathers. It is also one of the most commonly missed details in commercial steam room construction and a frequent source of guest complaints.

Waterproof substrate. All surfaces behind tile must use a waterproof membrane or cement board — no standard drywall anywhere in the steam room enclosure. Steam penetrates standard drywall and causes mold and structural damage over time.

Door seals. Commercial steam room doors must seal tightly when closed. Glass doors with proper seals are the most common choice — frameless glass is both practical and visually impressive for a premium spa environment. Even small gaps at the door significantly reduce efficiency and make it harder for the generator to maintain temperature.

Bench design. Commercial benches should be built from non-porous, steam-resistant materials. Tile-covered concrete benches are the most durable choice for commercial use — they hold up to daily heavy use, are easy to clean and disinfect, and do not absorb moisture or odors.

ADA compliance requirements

Commercial steam rooms open to the public must meet ADA requirements. Key requirements include:

• Door clearance — minimum 32" clear opening width (36" preferred), with level or ramped entry. No threshold steps
• Turning radius — 60" diameter clear turning space inside the steam room for wheelchair access
• Bench height — at least one bench section at 17"–19" from the floor with clear floor space alongside it
• Control placement — controls must be reachable from a seated position, typically 15"–48" from the floor, with operable parts requiring no more than 5 lbs of force to operate
• Slip resistance — floor surfaces must meet ADA slip resistance standards, particularly important in steam environments where floors are always wet

Always confirm ADA requirements with your architect and local building authority before finalizing the design — requirements can vary by jurisdiction and project type.

Plumbing, electrical, and drainage

Generator plumbing. Commercial generators require a cold water supply line (3/8" with a proper shutoff valve — no saddle valves), a steam line (copper or brass only — no PEX or PVC), and a drain connection. Insulate steam line runs over 20 feet and slope continuously to avoid condensation traps.

Electrical. Commercial generators require dedicated circuits sized to the generator's amperage. Three-phase power (208/240V or 480V) is the standard for commercial installations and is more efficient for high-kW generators. Confirm available power configuration with your electrician before ordering. All wiring by a licensed electrician per NEC and local codes.

Floor drainage. A floor drain inside the steam room is required — sized for continuous steam output over an extended operating day. The drain must be accessible and cleanable. In commercial environments, drain maintenance is a daily task.

Ventilation. Do not run an active exhaust fan during steam sessions — it pulls steam out of the room. A timer-controlled exhaust fan that activates after the session ends is the correct approach. The generator room requires its own ventilation per manufacturer specifications.

Hard water and commercial maintenance

Mineral scale buildup is the leading cause of steam generator failure — and the risk is significantly higher in commercial environments where generators run continuously for hours every day. Commercial steam room operators should plan for:

• Automated flush systems — every commercial generator should have an automated drain and flush system. The ThermaSol PowerPak Series III includes PowerFlush built in. Amerec generators can be paired with the ADK Auto Drain system. Mr. Steam AutoFlush is available for commercial installations. These are not optional in a commercial environment — they are essential
• Water treatment — in hard water areas, a commercial water softener upstream of the generator significantly extends generator life and reduces maintenance frequency
• Removable heating elements — spec generators with removable heating elements for easy field servicing. The Amerec AK Series and ThermaSol PowerPak Series III both feature heating elements that can be serviced without removing the generator
• Daily cleaning protocol — the steam room itself requires daily disinfection of all surfaces, benches, and drains. Establish a written cleaning protocol before opening

For more detail on hard water and steam generator protection, see our hard water and steam generator protection guide.

Safety signage and guest guidelines

All commercial steam rooms require safety signage posted at or near the entrance. Standard required notices include:

• Maximum recommended session length (typically 15–20 minutes)
• Recommended age minimum (typically 16 years old)
• Warning for persons who are pregnant, have cardiovascular conditions, low blood pressure, or are under medical care
• Warning against use of alcohol or medications before steam bathing
• Instructions to hydrate before and after sessions
• Emergency exit instructions

Confirm signage requirements with your local health department and legal counsel — requirements vary by jurisdiction and facility type.

Frequently asked questions

What size generator do I need for a hotel steam room?
Calculate the cubic footage of the room (length × width × height), then add a 25–30% buffer for commercial continuous use. For rooms up to 1,000 cubic feet, the ThermaSol PowerPak PP18SR (18kW) is the right starting point. For rooms over 1,000 cubic feet, the PP24LR (24kW) or Amerec AK ganged configurations up to 36kW cover up to 1,500 cubic feet. Contact our team for a complimentary sizing consultation.

What is the best material for a commercial steam room?
Porcelain or ceramic tile is the most practical choice for commercial use — non-porous, easy to disinfect, durable under heavy daily use, and does not require a material sizing adjustment for any generator brand. Natural stone is used in luxury spa environments but requires more maintenance, sealing, and larger generators for brands that apply a material multiplier.

How long can a commercial steam generator run continuously?
Commercial-grade generators from ThermaSol, Amerec, and Mr. Steam are designed for continuous operation throughout a business day. The key to long-term reliability is having the right generator capacity for the room size, an automated flush system to manage mineral scale, and a regular preventive maintenance schedule.

Do I need three-phase power for a commercial steam generator?
Not necessarily — the ThermaSol PowerPak and Amerec AK Series are both available in single-phase (208/240V) and three-phase (208/240V or 480V) configurations. However, most commercial buildings have three-phase power available, and three-phase is more efficient for high-kW generators. Confirm available power with your electrician before ordering.

Does a commercial steam room need to be ADA compliant?
Yes — commercial steam rooms open to the public must meet ADA requirements for accessible design, including door clearance, turning radius, bench height, control placement, and floor slip resistance. Confirm specific requirements with your architect and local building authority before finalizing the design.

How do I maintain a commercial steam room generator?
Spec an automated flush system at installation — it is far easier to install during rough-in than after the room is complete. Establish a regular maintenance schedule that includes periodic descaling, heating element inspection, water quality monitoring, and filter replacement if a water treatment system is installed. The ThermaSol PowerPak Series III and Amerec AK Series both feature removable heating elements that can be serviced in the field without removing the generator.

Ready to plan your commercial steam room?

Browse our commercial steam collections:

• ThermaSol PowerPak Series III — 18kW and 24kW commercial generators
• Amerec AK Series — gangable up to 36kW for rooms up to 1,500 cubic feet
• Mr. Steam CX Series generators — atmospheric commercial generators for high-capacity continuous use
• Full commercial steam collection — all brands and accessories

Contact our team or call 877-881-5501 for a complimentary commercial steam room sizing consultation — we work with hotels, spas, health clubs, and hospitality designers across the US.