Mr. Steam MS90R2401X MS 5 kW Steam Shower Generator of 240 Volt & 1-Phase with Express Steam

Mr. Steam MS90R2401X — 5 kW Steam Shower Generator with Express Steam (240V, 1-Phase)

The MS90R2401X is Mr. Steam's 5 kW residential generator built for steam enclosures up to approximately 135 cubic feet — think a standard 3×4 or 3×5 tiled shower with an 8-foot ceiling. The "X" in the model number means this is the Express Steam version, which cuts heat-up time roughly in half compared to the standard MS90R2401, getting steam into your enclosure in about 60 seconds instead of the usual few minutes.

Who this generator is for

This is the right unit if your steam shower enclosure measures between 80 and 135 cubic feet and is finished in non-porous material like ceramic or porcelain tile. If you have natural stone (marble, granite, slate) or large glass surfaces, those materials absorb more heat — you'll likely want to step up to the 7.5 kW MS225 series instead. Not sure what size you need? Use our steam shower sizing calculator to get a recommendation based on your exact dimensions and materials.

What makes this unit stand out

The MS90R2401X runs on a standard 240V single-phase circuit, which most homes already have available or can add without a panel upgrade. The full stainless steel construction — tank, housing, and internals — means no corrosion issues even after years of daily use. The copper heating element is industrial-grade and oversized relative to the unit's output, which means it heats fast and is designed to be removed and serviced without replacing the entire generator.

Mr. Steam builds and assembles every generator at their facility in Long Island City, New York, and backs this unit with a lifetime residential warranty covering defects in materials and workmanship.

Express Steam vs. Standard — is the upgrade worth it?

If you're using your steam shower as part of a daily routine (morning wake-up, post-workout recovery), the Express Steam upgrade is worth every dollar. Waiting 5+ minutes for steam gets old fast and usually means people stop using the shower altogether. At roughly 60 seconds to steam, the Express version makes a steam session as effortless as turning on a regular shower. If your steam shower is more occasional — weekend relaxation, a few times a month — the standard MS90R2401 saves a few hundred dollars and still delivers the same steam quality once it's up to temperature.

Installation basics

The generator mounts remotely — in a closet, vanity cabinet, under a sealed bench, or in an insulated attic space — within 25 feet of the steam head. It requires a dedicated 240V circuit (30 amp breaker for the 5 kW model), a cold water supply line, and a drain connection. Most installations are handled by an electrician and plumber in a few hours. The unit measures roughly 15" × 15" × 7", so it fits in tight spaces.

Expandable with Mr. Steam's therapy accessories

The MS90R2401X is fully compatible with Mr. Steam's add-on therapy systems, including AromaTherapy (essential oil delivery through the steam head), ChromaTherapy (in-shower LED lighting), and MusicTherapy (Bluetooth audio). These can be added at install or retrofitted later. The generator's microprocessor control board is also compatible with all current Mr. Steam digital controls (iTempoPlus, TempoFlex) and the SteamLinx WiFi module for smartphone control.

Key specs

• Output: 5 kW (5,000 watts) with Express Steam fast heat-up
• Voltage: 240V, single-phase, 60 Hz
• Recommended enclosure size: 80–135 cu. ft. (tile/non-porous surfaces)
• Construction: 100% stainless steel, 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

Questions? Call us at 877-881-5501 — we've been selling and supporting Mr. Steam generators for over 20 years and can help you confirm sizing, choose the right control package, and walk through installation requirements.