A steam room generator turns a sealed shower into a steam room. It is a boiler that sits in a vanity, closet or nearby space and pipes steam to a head in the shower. This is not a plug in product: it needs a 240 volt circuit, a water line and a drain, and the shower itself must be built for steam. If you want steam with no install, see our portable steam saunas.
This roundup scores five generators sold on Amazon on what each listing states. Listings were collected 3 October 2026.
This article is informational and is not medical advice. Do not use a steam room if you are pregnant, have been drinking alcohol, or feel unwell. Speak to a doctor first if you have a heart condition, blood pressure problems or a breathing condition. Keep sessions short, drink water, and keep skin away from the steam head. See our Medical Disclaimer.
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Quick picks
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1
Delta Faucet SimpleSteam 7.5kW Steam System Kit Chill Score 9.5/10Check price on AmazonA 7.5 kW, 240 volt generator kit from a major plumbing brand, with digital control, steam head, a 35 foot cable and a limited lifetime warranty.
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2
VEVOR Steam Shower Generator, 12 kW Chill Score 9.5/10Check price on AmazonA 12 kW generator for rooms up to 355 cubic feet, with segmented heating, a 24 hour timer, auto drain, and overheat, low water and overpressure protection.
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3
VEVOR Steam Generator, 9 kW Steam Shower System Chill Score 9.5/10Check price on AmazonA 9 kW generator for 212 to 318 cubic feet with auto drain, a timer from 10 minutes to 24 hours, and overheat, dry run and overpressure cutoffs.
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4
CGOLDENWALL 6KW Commercial Self-Draining Steam Chill Score 9.5/10Check price on AmazonA 6 kW, 220 volt self draining generator for rooms up to 212 cubic feet, with a touch screen and a timer up to 12 hours.
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5
9kw Steam Sauna Generator Executive Bundle 240v Chill Score 9.4/10Check price on AmazonA 9 kW, 240 volt bundle with two touch pads, steam heads, a pressure relief valve, auto drain, a filter, an LED light and an install kit.
What we picked for home recovery
A 7.5 kW, 240 volt generator kit from a major plumbing brand, with digital control, steam head, a 35 foot cable and a limited lifetime warranty.
Pros & ConsViewHide
Pros
- Limited lifetime warranty stated
- Kit includes generator, digital control and steam head
- 35 foot control cable
- Same line sold in 4 to 15 kW, so you can size to the room
Cons
- Auto drain and drain pan sold separately
- No room size in the listing data
- Most expensive per kW here
A 12 kW generator for rooms up to 355 cubic feet, with segmented heating, a 24 hour timer, auto drain, and overheat, low water and overpressure protection.
Pros & ConsViewHide
Pros
- States the room size: up to 355 cubic feet
- Overheat, water shortage and overpressure protection stated
- Automatic drain and 24 hour timer
- Low price for the output
Cons
- UL wording covers only the heating elements
- No warranty term in the listing data
- Draws about 50 A at 240V, a large circuit
A 9 kW generator for 212 to 318 cubic feet with auto drain, a timer from 10 minutes to 24 hours, and overheat, dry run and overpressure cutoffs.
Pros & ConsViewHide
Pros
- States a room size range: 212 to 318 cubic feet
- Overheat, dry run and overpressure protection stated
- Auto drain after use
- Lowest price of the five
Cons
- No warranty term in the listing data
- No electrical safety listing named
- Draws about 38 A at 240V
A 6 kW, 220 volt self draining generator for rooms up to 212 cubic feet, with a touch screen and a timer up to 12 hours.
Pros & ConsViewHide
Pros
- States room size, 212 cubic feet, and a 40 A current
- Auto drain and dual tank design
- Timer from 30 minutes to 12 hours
Cons
- No warranty term in the listing data
- No electrical safety listing named
- Narrow temperature range, 95°F to 131°F
A 9 kW, 240 volt bundle with two touch pads, steam heads, a pressure relief valve, auto drain, a filter, an LED light and an install kit.
Pros & ConsViewHide
Pros
- Most complete bundle: control, steam heads, filter, light and install kit
- Pressure relief valve and built in auto drain stated
- Steam in 1 to 2 minutes, stated
Cons
- No room size in the listing data
- No warranty term in the listing data
- Pricier than VEVOR and CGOLDENWALL at the same output
More to compare
CGOLDENWALL 9KW Commercial Self-Draining Steam GeneratorCheck price on Amazon
LifePro Revivify Steamer 2.6L Steam Sauna Generator MachineCheck price on Amazon
CGOLDENWALL 4.5KW Luxury Self-draining Steam Generator ShowerCheck price on Amazon
Portable Sauna Steamer MachineCheck price on Amazon
The circuit each one needs
Current at 240 volts is power divided by voltage. We calculated it from each listing’s stated kW. It is the draw while heating, not the breaker size; your electrician sizes the breaker and wire to code.
| Generator | Power | Draw at 240V | Room size stated | Auto drain |
|---|---|---|---|---|
| Delta SimpleSteam 7.5kW | 7.5 kW | About 31 A | Not stated | Sold separately |
| VEVOR 12kW | 12 kW | About 50 A | Up to 355 cu ft | Yes |
| VEVOR DO-90 9kW | 9 kW | About 38 A | 212 to 318 cu ft | Yes |
| CGOLDENWALL 6kW | 6 kW | About 25 A (40 A stated) | Up to 212 cu ft | Yes |
| SteamSpa Executive 9kW | 9 kW | About 38 A | Not stated | Yes |
To size a generator, multiply the inside length, width and height of your shower in feet to get cubic feet, then pick a unit whose stated range covers it. Tile, stone and glass take more steam than acrylic, and a high ceiling adds volume, so ask the manufacturer when you are near the top of a range. Installation needs a licensed electrician, and in most places a plumber and a permit as well.
What each one costs to run
At full rated power, using 18.34 cents per kWh, the US residential average for June 2026 from the Energy Information Administration. A generator runs flat out to build steam, then cycles to hold temperature, so a real session costs less.
| Product | Rated power | Per one hour | Per month, 4 sessions a week |
|---|---|---|---|
| VEVOR 12kW | 12,000 W | $2.20 | $38.15 |
| SteamSpa Executive 9kW | 9,000 W | $1.65 | $28.61 |
| VEVOR DO-90 9kW | 9,000 W | $1.65 | $28.61 |
| Delta SimpleSteam 7.5kW | 7,500 W | $1.38 | $23.84 |
| CGOLDENWALL 6kW | 6,000 W | $1.10 | $19.07 |
The table assumes an hour at full power. Most steam sessions are shorter and the heater cycles once the room is up to temperature, so real costs are lower. The bigger cost is the install: a new 240 volt circuit, plumbing and a vapor tight enclosure.
What 20 listings state
We read 20 generator listings. Nineteen state a kW rating, but only 5 state the room size it suits and 2 state the current it draws. Six state a warranty term, and 3 mention a UL or CSA listing, often for a part rather than the whole unit.
Score notes
The Chill Score weighs performance 35, build 25, value 25, safety certifications 10 where it applies and warranty 5. Here, performance covers stated room sizing, controls, auto drain and safety cutoffs. VEVOR’s 12 kW gets a little safety credit for UL certified heating elements; no other pick names a listing.
| Product | Chill Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Delta SimpleSteam 7.5kW | 9.5 | 27 | 22 | 19 | 0 | 4 |
| VEVOR 12kW | 9.5 | 29 | 20 | 21 | 2 | 0 |
| VEVOR DO-90 9kW | 9.5 | 29 | 20 | 22 | 0 | 0 |
| CGOLDENWALL 6kW | 9.5 | 29 | 20 | 21 | 0 | 0 |
| SteamSpa Executive 9kW | 9.4 | 29 | 21 | 19 | 0 | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.
Delta scores highest on its lifetime warranty and build, but you pay more and buy the drain separately. VEVOR’s 12 kW states the most about sizing and protection for the money.
Who should not buy one
If your shower has an open top, a gap above the glass, or a ceiling that is not sealed, it is not a steam room yet. Steam will escape and moisture can damage the room around it.
If your panel cannot take another 30 to 50 amp circuit, price a panel upgrade first, or choose a sauna that runs on less.
Common questions
What size steam generator do I need?
Work out the cubic feet of the shower, then use the range each brand states. Of our picks, VEVOR and CGOLDENWALL state ranges; ask Delta and SteamSpa for theirs.
Do I need auto drain?
It empties the tank after each use, which reduces scale. Four of our five include it; Delta sells it separately.
Can I install it myself?
The electrical work needs a licensed electrician, and most areas require a permit. Check local rules before you buy.
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