The SteamSpa OAT1200MK is a 12 kW Oasis Series steam generator package with a wall-mounted touch control panel, plus two matte black steamheads, without AutoDrain. This SteamSpa 12 kW steam shower generator turns a sealed shower enclosure of about 147 to 315 ft³ into a home steam room, and it suits a homeowner who wants a straightforward, quiet steam shower with a simple touch panel.
A session starts at the touch panel on the shower wall: turn on the water supply valve and the breaker, press power, and the generator fills and heats its tank; SteamSpa's QuickStart technology brings steam within minutes. Set the steam time anywhere from 1 to 60 minutes, save two favorite time and temperature combinations as SET1 and SET2, and recall them with one press. The panel also keeps a real-time clock and switches between °F and °C. The room temperature climbs as the steam comes in, and when it reaches your setting the steam stops, while the dual-tank design keeps the output continuous until then.
Sized for 147 to 315 ft³ Steam Rooms
SteamSpa's sizing chart lists 12 kW for cabins from 3' x 7' x 7' (147 ft³) and 4' x 6' x 7' (168 ft³) all the way up to 5' x 9' x 7' (315 ft³), the largest room on its single-generator chart. SteamSpa adds that it is safe, and even recommended, to choose one size step above what the chart shows. At 12 kW the generator suits a large steam shower or a two-person steam room, and because the steam is produced outside the enclosure, the shower itself only needs its steamheads, a control and a properly sealed enclosure.
Built-In Aromatherapy
Steam enters the shower through two matte black steamheads. The integrated scent system disperses fragrance through the steam, and an aroma sample comes in the box so you can try it on day one. A pressure relief valve comes in the package to protect the generator. SteamSpa recommends pairing this package with its SSD-STMKIT Complete Essentials Installation Kit, which gathers a solid brass pressure reducing valve with gauge, a water shut-off valve, a 20" steel flex hose, the unions that form a quick release system and 90 degree elbows for the steam line.
Relief Valve and Tank Drain
This version has no AutoDrain, so the tank is emptied through the manual drain valve; the OAT1200MK-A model adds AutoDrain. The generator measures 21.06" W x 9.21" D x 15.16" H and holds 330 in³ of water, building steam at 5 psi, and a pressure relief valve opens automatically if the tank pressure ever passes 15 psi. The generator has a hanging groove for wall mounting and must be installed level, so its water level sensor reads correctly.
Power, Plumbing and Placement
Plan the power and plumbing before the walls close. At 12 kW the generator draws 50A at 240V single phase on 6 AWG copper wire, with its own breaker and a power disconnect within sight of the unit, and it can sit in a closet behind the shower, a vanity cabinet, the attic or the basement, as long as it stays indoors, dry, protected from freezing and less than 25' from the steam room. The 10.5 kW and 12 kW generators have two steam outlets, and each outlet gets its own steam line to its own steamhead.
With about 147 to 315 ft³ of steam room in reach and two matte black steamheads in the shower, the SteamSpa OAT1200MK gives you a complete 12 kW steam shower package from one brand, ready for a licensed electrician and plumber to install.
Features
12 kW for 147 to 315 ft³
SteamSpa's sizing chart matches 12 kW to a large steam shower or a two-person steam room of about 147 to 315 ft³, so the generator is matched to the room's volume; SteamSpa says choosing one size up is safe and even recommended.
Touch Panel With Memory
The touch panel sets the steam time from 1 to 60 minutes and saves two favorite settings as SET1 and SET2, so each session starts with one press.
QuickStart Steam
SteamSpa's QuickStart technology brings steam within minutes, and the dual-tank design keeps it flowing continuously, so a session starts with little waiting.
Matte Black Steamheads
Steam enters through two matte black steamheads; each sits on its own steam line from its own generator outlet, about 12" above the floor, pointing down.
Manual Drain, AutoDrain Optional
This version drains through the manual drain valve after use, which keeps the package simpler; choose the OAT1200MK-A model if you want the tank to empty itself automatically.
Automatic Pressure Relief
A pressure relief valve comes in the package and opens automatically when tank pressure passes 15 psi, an added layer of protection for the generator and the home.
Standard 50A, 240V Circuit
At 12 kW the generator runs on a dedicated 50A, 240V single-phase circuit with 6 AWG copper wire, its own breaker and a power disconnect within sight of the unit.
Whisper-Quiet Operation
SteamSpa engineers the Oasis generator for whisper-quiet running, so the generator stays in the background and does not disturb the calm of a steam session.
Specifications
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Model: OAT1200MK
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Power: 12 kW
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Electrical: 240V single phase, 50A, 6 AWG wire, dedicated breaker
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Recommended Room Size: 147 to 315 ft³ (SteamSpa sizing chart)
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Steam Outlets: 2
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Steam Pressure: 5 psi
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Tank Water Volume: 330 in³
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Steam Time: 1 to 60 minutes
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Water Supply: 1/2" copper or brass, hot or cold, 15 to 20 psi
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Steam Line: 3/4" copper or brass, no valves
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Drain Line: 1/2", gravity drain
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Pressure Relief Valve: 3/4", opens above 15 psi
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Inlet Water Temperature: 160°F maximum
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Steamhead Finish: Matte Black
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Steamheads: 2
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Control: Touch control panel with time, temperature and memory settings
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AutoDrain: Not included
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Generator Dimensions: 21.06" W x 9.21" D x 15.16" H (with fittings)
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Generator Location: Indoors only, outside the steam room
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Installation: Licensed electrician and plumber; inline water filter required
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Warranty: Generator: limited lifetime; controls and accessories: 1 year
What's Included
- Oasis Series 12 kW steam generator
- Touch control panel
- Two steamheads, matte black
- Pressure relief valve
- Aroma sample
Sold separately: Inline water filter (required by SteamSpa), Pressure reducing valve and quick connect and release fittings (SteamSpa SSD-STMKIT installation kit), 3/4" steam pipe, 1/2" water supply and drain piping, 240V wiring and breaker
Installation & Care
Installation
Electrical: 12 kW at 240V single phase draws 50A; run 6 AWG insulated copper wire rated 194°F and 300V on its own breaker, with a power disconnect within sight of the generator and a proper ground. Plumbing: a 1/2" hot or cold supply at 15 to 20 psi through a pressure reducing valve, the inline filter and a quick connect and release fitting, in copper or brass only (no PEX or PVC), with inlet water no hotter than 160°F. Run 3/4" copper or brass steam pipe with curved elbows, sloped so condensation drains back, with no valves and no dips, insulated where it can be touched, and keep it off any wall material not rated to 240°F. Mount the steamheads about 12" above the floor, outlet down and away from any bench, keep the temperature sensor or control off the steamhead wall, seal every pipe and fitting with 100% silicone caulk, and add an exhaust fan outside the steam room. Leave 12" of clearance on both sides and the top of the generator. SteamSpa requires a licensed electrician and a licensed plumber, and the installation manual is in Resources.
Care
Drain the tank through the drain valve after use so minerals do not settle. Replace the inline filter cartridge at least every 6 months, clean the water supply pipes once a year, and have the generator, steamhead, pipes and fittings checked for leaks every year. About every six months, a technician can remove the cover and clean scale off the water level sensor prong. Wipe the steamheads with soapy water and a soft sponge, never with harsh chemicals or abrasive tools. Children under 16 should not use the steam room, and because SteamSpa generators are not boilers, check with your local inspector before any commercial use.
Resources
Shipping, Returns & Warranty
SteamSpa ships this item from the SW Corp warehouse by UPS, FedEx or USPS, usually within 1 to 2 business days of your order. Shipping is free within the lower 48 states on orders of $101 or more (orders under $101 ship for a flat $15); for Alaska or Hawaii, contact us before you order. You'll get tracking by email as soon as it ships.
Inspect the packaging and the product before you sign. Note any damage or shortage on the delivery receipt, then email photos to support@mycleansupplies.com within 48 hours of delivery so the freight claim can be filed. Damage reported after 48 hours can't be claimed.
Unused SteamSpa products in their original packaging can be returned within 21 days of delivery. Ask us for a return authorization before you ship. You pay the return shipping, which for a freight item means the freight cost, and a 20% restocking fee is deducted along with payment processing fees. Installed, used or damaged products and special-order items can't be returned.
SteamSpa warrants the steam generator against defects in materials and workmanship for its lifetime and repairs or replaces it at its option; the controls, steamhead and other accessories are covered for one year from purchase. Register the generator at steamspa.com/register within 90 days of delivery. The warranty requires installation by a licensed professional, an inline water filter whose cartridge is replaced at least every 6 months, and a quick connect and release fitting for maintenance. It covers residential use only, and surface damage must be reported within 5 days of delivery.
Warranty claims. Call SteamSpa at 1-866-588-8008 or email info@steamspa.com with your proof of purchase and the model number. Register the generator at steamspa.com/register within 90 days of delivery, or the warranty is not active. Contact us with your order number if you would like help with the claim.
About SteamSpa
SteamSpa makes residential steam shower generators, wireless and touch controls, steamheads and steam room accessories. It is part of SW Corp in Miami, Florida, the company behind ANZZI and MediTub.
The Oasis Series touch packages pair a SteamSpa generator from 4.5 kW to 12 kW with a touch control panel and round steamheads in matte black, gold, brushed nickel, polished chrome or oil rubbed bronze; the 10.5 kW and 12 kW sizes carry two steamheads, and every size comes with or without AutoDrain (the -A models add it). SteamSpa recommends pairing it with the SSD-STMKIT Complete Essentials Installation Kit, and the SS-EOIL6P-XX aroma oils, G-CLIGHT chromotherapy light and G-DPAN drain pan are sold separately.
