The steam generator is the heart of every steam shower, and choosing the right one comes down mostly to size. Mr. Steam organizes its residential generators into three lines — MS, Super, and MX — that together cover steam rooms from a compact shower up to 964 adjusted cubic feet. This guide breaks down each line, every size within it, and how to choose the right generator for your space.
First, see how a Mr. Steam generator turns water into steam:
The three lines at a glance
Start with adjusted cubic feet
Mr. Steam sizes its generators by adjusted cubic feet, not just the room's raw length, width, and height. The adjustment accounts for construction details like natural stone, glass, and ceiling height, which can increase how much steam a room needs. Two showers with the same dimensions can need different generators depending on how they are built.
Find your size first: use our steam sizing calculator to get your room's adjusted cubic feet, then match it to the ranges below.
Model links in the tables below go to the 240V standard version. Each model is also available in 208V and Express Steam versions.
MS Series: standard residential steam showers
The MS Series is Mr. Steam's line for typical residential steam showers, from compact enclosures up to 257 adjusted cubic feet.
Super Series: larger residential steam rooms
When a room outgrows the MS Series, the Super Series picks up from 258 adjusted cubic feet — a common choice for spacious primary bath steam showers and custom spa-style rooms.
MX Series: the largest residential steam rooms
The MX Series is Mr. Steam's most powerful residential line, built for extra-large luxury steam rooms beyond 482 adjusted cubic feet.
Features across the lineup
- Microprocessor operating system — Mr. Steam's exclusive microprocessor is the brains of the generator.
- 60-minute automatic cutoff — a built-in safety feature.
- Low voltage board — designed for easy access and safe service.
- Water-efficient — according to Mr. Steam, a 20-minute steam session uses about two gallons of water or less, depending on the model.
- Voltage options — many models are offered in both 240V and 208V single-phase versions. Check the model number: 2401 models are 240V, and B1 models are 208V.
- Express Steam versions — many models are also offered in an Express Steam version, identified by an X at the end of the model number.
- Flexible placement — the generator installs outside the steam shower, up to 60 feet away, in a closet, vanity cabinet, heated attic, or basement.
AutoFlush: protecting the generator
Mineral buildup is the biggest threat to any steam generator. Mr. Steam's AutoFlush automatically flushes sediment and old water from the generator about two hours after every steam session — no buttons to push. The standard AutoFlush fits the MS and Super Series, and the MX Series uses AutoFlush Max.
Generator packages
Mr. Steam also bundles its generators into complete packages with a control, steamhead, AutoFlush, and condensation pan in one order. The Basic Butler package, for example, pairs the generator with an iTempo control, a matching AromaSteam steamhead, AutoFlush, and a condensation pan. Other packages step up to more advanced controls, lighting, and audio.
New to steam showers? Read how a steam shower works to see where the generator fits in the full system.
Frequently asked questions
Which Mr. Steam generator do I need?
Start with your room's adjusted cubic feet, then match it to the ranges above. Rooms up to 257 adjusted cubic feet use the MS Series, 258 to 482 use the Super Series, and 483 to 964 use the MX Series.
What is the difference between 2401 and B1 models?
Voltage. Models ending in 2401 run on 240V single-phase, and B1 models run on 208V single-phase. Match the model to your home's electrical service.
How far from the shower can the generator go?
Up to 60 feet, in an accessible location such as a closet, vanity cabinet, heated attic, or basement. Avoid unheated spaces where water lines could freeze.
Do I need AutoFlush?
It is optional, but it automatically flushes mineral sediment after every session, which helps protect the generator — especially in hard water areas.
Why order from TheSteamStore.com?
- Authorized dealer
- Free shipping — on all orders over $199 (restrictions apply)
Shop Mr. Steam steam generators and packages or contact our team at 877-881-5501 for help choosing the right size.