Monoplace vs Multiplace Hyperbaric Chambers: Which Configuration Fits

[ Multi-seat install ] Reference imagery; final photography in production

What the terms mean

Monoplace means one person per session: a capsule you lie down in, sized like a small couch. Multiplace means seats, plural: a walk-in chamber where two to six people sit through a session together. The words sound technical, but the decision they carry is simple and it comes before any brand comparison, because it sets your budget band, your space plan, and your electrical work all at once. Whether you lie down or sit up is a separate choice from seat count, and sitting vs lying chambers compares the sizes, doors and access of each.

Side by side

Figures from the manufacturer price list and specifications for the hard-shell range we score; sources per model in the Price Index.

Who buys which

Home buyers pick monoplace, and it is rarely close. A capsule fits through a standard door, runs on household power, and holds one person in comfort for the hour a session takes. The multiplace case is a business case: one operator, several paying seats per session, and the payback math that follows. We run those numbers in the clinic ROI guide.

The trap in between

The mistake we see is buying more chamber than the use case: a two-seat unit for a home because a couple plans to share sessions, or an oversized chamber for a clinic that has not tested demand. The bigger shell costs more to buy, move, power, and cool, and an empty seat earns nothing. Decide the configuration from real usage, then pick the brand from the scorecard, and pressure-check any claim against the pressure guide before money moves.

Configuration sets the budget band; the cost guide itemizes what fills it, and the break-even math tests whether a home capsule beats paying per session at all.

Value for volume across the range

Our dollars per liter index makes the configuration economics visible. The capsule you buy for one body costs about $43 to $52 per liter of pressurized space; the multi-seat chambers run $20 to $31 because shell cost does not scale with size. The full table lives in the cost guide, and the lesson for this page is simple: multi-seat space is cheap per liter and expensive per empty seat. The index rewards clinics that fill seats and punishes homes that buy capacity on optimism.

How hospitals run each type

The same split exists in hospital medicine, and the patient pages describe it plainly. The Divers Alert Network treatment reference says recompression can run in a monoplace chamber, often an acrylic tube sized for one patient, or in a multiplace chamber that holds patients plus attendants, called tenders. The biggest practical difference is the gas. A hospital monoplace is usually filled with oxygen, so Prince of Wales Hospital in Sydney tells patients no mask or hood is needed. A hospital multiplace is pressurized with air, and each person breathes oxygen through a mask or a clear hood, with short air breaks between oxygen periods.

Hospital patient information as summarized, with links, in our guides to what a session feels like and decompression chambers.

None of this carries over to a home capsule by default. A wellness chamber is not a hospital vessel, and the gas is the clearest gap. The UHMS describes mild sessions as a mask or nasal cannula inside an air-filled chamber, and says fabric chambers are built to be compressed with air only. Our mild vs medical guide sets the two side by side on pressure, oxygen and supervision.

How the rules sort them

Seat count is not only a sales category. NFPA 99, the US fire code for health care facilities, classes chambers by who is inside them: Class A is human, multiple occupancy, and Class B is human, single occupancy. Draft annex text in the 2024 first-revision report says the industry calls Class A multiplace and Class B monoplace. A capsule built for one person is Class B whether the shell is hard or soft. The class matters because rules name it. In the draft revisions we read, the clothing rules name both classes, and the rule calling for qualified inside attendants names Class A only. Our NFPA 99 guide covers which buildings the code reaches.

The device rules do not split the same way. In the US, both configurations sit under the same FDA classification, Class II under product code CBF, and each model is cleared on its own. The Sechrist 3300H/HR and 3600H/HR monoplace chambers (K140559) and the FINK multiplace chambers (K240569) are both marked Prescription Use, as our prescription guide shows. In the EU, a search of the EUDAMED device database on 9 October 2026 returned 21 records for whole chambers or chamber systems, monoplace and multiplace alike, and every one was registered as Class IIb. Those are the makers' own entries, covered in our CE marking guide. So configuration changes the fire code class and the staffing rules, not the device class.

For a clinic, that is the practical point. A multiplace chamber brings inside attendants into the plan, and the certifications operators hold are the ones our clinic staffing guide lists. A home buyer choosing a capsule is choosing the single-occupancy class, where the user is alone inside the vessel.

The decision matrix

Four inputs settle the configuration before any brand talk. Bodies per session: one person means capsule, full stop; three or more paying clients means C-series. Space: a capsule asks for a wall; a multi-seat chamber asks for a room with a planned delivery route. Power: household circuit against a dedicated 3.5 kWh line. And payback: a home buyer breaks even against clinic visits in one to three years of real habit, while a clinic needs booking density from month one. Write your four answers down before a salesperson writes them for you, then test the result against the scorecard.