Mr. Steam MSSUPER1R2401X Super 10 kW Steam Shower Generator of 240 Volt & 1-Phase with Express Steam

Mr. Steam MSSUPER1R2401X — Super 10 kW Steam Shower Generator with Express Steam (240V, 1-Phase)

The MSSUPER1R2401X is the Express Steam version of Mr. Steam's most powerful single-phase residential generator. Same 10 kW output as the standard Super, same stainless steel build, same lifetime warranty — but with one significant upgrade: Express Steam technology cuts heat-up time to roughly 60–90 seconds, even in the large enclosures this unit is designed to serve. If you're building a high-end steam shower and plan to use it daily, this is the model we recommend most often.

Why Express Steam matters more at 10 kW than at smaller sizes

On a compact 5 kW unit serving a small shower, the difference between standard and Express heat-up is maybe two minutes. Noticeable but not a dealbreaker. On a 10 kW unit serving a 300+ cubic foot enclosure, the math changes. A larger room has more thermal mass — more tile, more air volume, more surface area absorbing heat before steam begins to accumulate. The standard MSSUPER1R2401 can take 4–6 minutes to fill a big room, especially in winter when cold walls and ambient temperatures work against you. The Express Steam version eliminates that lag almost entirely. You press the button, and by the time you've undressed and stepped in, the room is ready. That difference is what turns a steam shower from something you use occasionally into something you use every morning.

Sizing: is 10 kW the right output for your enclosure?

The Super 10 kW handles residential enclosures up to approximately 360 cubic feet with non-porous tile surfaces. In practical terms, that's a generously sized steam shower — a 5×6 footprint with a 10-foot ceiling, or a 4×7 with a standard 8-foot ceiling. Natural stone changes the equation significantly. Marble, granite, and slate absorb and radiate heat, which increases the effective cubic footage your generator needs to overcome. A room that measures 280 cubic feet on paper might perform like 350+ cubic feet once you factor in stone walls and a granite bench. If your enclosure is heavily finished in natural stone and measures above 300 cubic feet, you may need to move up to the 15 kW MX series.

Not sure where you land? Our steam shower sizing calculator gives you a generator recommendation based on your exact dimensions and materials. Or call us at 877-881-5501 and we'll walk through it with you.

How this compares to the standard MSSUPER1R2401

The two units are mechanically identical — same tank, same stainless steel construction, same copper heating element, same control board compatibility, same electrical requirements, same installation footprint. The Express Steam model adds an enhanced heating circuit that delivers a faster initial burst of energy to the heating element, dramatically reducing the time from cold start to full steam production. Once both units are at operating temperature, the steam output is the same. The price difference between standard and Express typically runs a few hundred dollars. For a unit at this level — serving a premium shower that likely cost five figures to build — the Express upgrade is one of the easiest decisions in the project.

Electrical and installation requirements

This unit draws approximately 42 amps at 240V single-phase, requiring a dedicated 50-amp breaker and 6-gauge wiring. That's a substantial circuit — have your electrician confirm your panel has capacity before ordering, particularly in older homes with 100- or 150-amp service. The generator installs remotely within 25 feet of the steam head, in any dry, accessible location: a utility closet, vanity cabinet, insulated attic, or under a sealed shower bench. You'll also need a cold water supply line and a drain connection at the installation point. The compact form factor fits comfortably in most utility spaces despite the 10 kW output.

Full ecosystem compatibility

The MSSUPER1R2401X works with every current Mr. Steam control — the iTempoPlus, TempoFlex, and iSteam3 digital interfaces — plus the SteamLinx WiFi module for smartphone and Alexa voice control. It also supports the complete therapy accessory lineup: AromaTherapy for essential oil delivery through the steam head, ChromaTherapy for in-shower LED mood lighting, and MusicTherapy for Bluetooth audio. All accessories plug into the generator's control board and can be added at initial installation or retrofitted later without replacing the unit.

If you're building a new steam shower from scratch and want everything in one purchase, check our Mr. Steam control packages — they bundle the control, steam head, and accessories at a better price than buying components separately.

Built and backed for life

Every component is 100% stainless steel — no painted mild steel housings that rust over time. The copper heating element is industrial-grade, the largest in the residential steam industry, and engineered to be removed and serviced without replacing the generator. The onboard microprocessor manages temperature regulation, a 60-minute automatic safety shutoff, and LED diagnostic indicators for troubleshooting. Mr. Steam backs the MSSUPER1R2401X with a lifetime residential warranty covering defects in materials and workmanship, and every unit is built at their facility in Long Island City, New York.

Key specs

• Output: 10 kW (10,000 watts) with Express Steam rapid heat-up
• Voltage: 240V, single-phase, 60 Hz
• Circuit requirement: Dedicated 50A breaker, 6-gauge wire (verify with electrician)
• Recommended enclosure size: 250–360 cu. ft. (tile/non-porous surfaces)
• Heat-up time: Approximately 60–90 seconds (Express Steam)
• Construction: 100% recyclable stainless steel, industrial copper heating element
• Certifications: UL listed (US & Canada), CE and NOM certified
• Water usage: Less than 2 gallons per 20-minute session
• Auto shutoff: 60-minute safety timer
• Warranty: Mr. Steam lifetime residential warranty
• Made in Long Island City, NY, USA

This is our most-recommended generator for large residential steam showers. If you're spending the money to build a premium enclosure with quality tile work, a solid bench, and a glass door, pairing it with the Express Steam Super is the move. Call us at 877-881-5501 if you want help confirming sizing or putting together a complete package with the right control and accessories — we do this every day.