You’ve floated a few times, you liked it, and now you’re doing the thing everybody does next: standing in the spare bedroom doorway trying to picture a tank in there. The question isn’t whether you want one. It’s whether that room can actually take it.
Here’s the honest answer, from the people who build them. A personal float tank is not a bathtub and it’s not a hot tub. It has its own footprint, its own electrical requirement, and one installation issue that catches almost everybody off guard. None of it is exotic. All of it is worth knowing before you buy.
Will a float tank fit in a spare room?
The Royal Spa Personal Float Tank measures 96 by 60 by 29.5 inches. That’s eight feet long, five feet wide, and a little under two and a half feet tall. Forty square feet of floor.
Most spare bedrooms clear that easily. What people forget is the space around it. You need room to walk the long side, room to lift and set the lid, and room to stand and towel off without stepping into a wall. A ten by twelve room works comfortably. A converted closet does not.
Check the doorway too. The tank comes in as a one-piece fiberglass shell with no seams, so it doesn’t break down into parts at the door. Measure your hallway turns and your door width before you fall in love with a room at the back of the house.
Can your floor hold a float tank?
Empty, the tank weighs 435 pounds. Filled, it’s about 2,400 pounds. That’s 175 gallons of water carrying a heavy load of dissolved magnesium sulfate, and salt water is denser than the water in your pipes.
Spread 2,400 pounds across a forty square foot footprint and you get roughly 60 pounds per square foot sitting in one spot for years. The manufacturer requirement is straightforward: a hard, level surface. In practice that means a basement slab or a ground floor over slab is the easy path, and it’s where most home installs end up.
Second floor? Don’t guess, and don’t let anyone talk you into guessing. Have a local structural engineer or licensed contractor look at your joists and sign off. All installation work has to meet your local codes and ordinances anyway, so you’re bringing a pro in regardless.
What electrical does a float tank need?
This is the line item people budget zero dollars for. The Personal Float Tank requires 220V, 20 amp, three wire with ground, GFI protected, on a Hubbell L14-30 receptacle or equivalent.
Translated: a dedicated 220 volt circuit run by a licensed electrician, not an extension cord from the laundry room. If your panel has capacity and the room is near it, this is a short job. If the panel is full or the room is on the far end of the house, it costs more. Get a quote before you order, not after the freight truck shows up.
The pump itself is built for low draw, which is the part that matters after installation day. You pay the electrician once. You pay the power bill every month for twenty years.
Humidity is the part people miss
Here’s the one that surprises homeowners. You are putting 175 gallons of warm water, held near skin temperature, into a closed room in your house. Warm water evaporates. That moisture has to go somewhere.
The requirement is proper in-room HVAC sized to handle the humidity. Depending on the room, that can mean an exhaust fan vented outside, a dedicated dehumidifier, or a look at how the room ties into your existing system. Skip it and you’ll find out the hard way, usually as condensation on the ceiling, peeling paint, or a musty smell that won’t leave.
Salt air is also unkind to bare metal. Choose finishes and fixtures for the room accordingly, and give yourself a way to move air after a session.
What comes with the tank and what doesn’t
The Personal Float Tank is $9,100 as of August 2026, and it’s honest about what that covers. You get the tub and the mechanicals. Everything else is separate.
Not included: the magnesium sulfate itself, an extra filter, maintenance supplies like a skimmer net, hydrometer, and chlorine, and freight shipping, which runs to the continental United States and Canada. Build those into your number from the start and there are no surprises later.
What you’re buying is a one-piece fiberglass shell with no seams to leak, an ozone and UV purification system, and a 5-year structural warranty behind it. Royal Spa has built water therapy equipment in Indianapolis since 1981 and float tanks since 2012, and the line has been engineered for Epsom salt since 1995. That last one matters more than it sounds. Magnesium sulfate destroys ordinary equipment, which is why most manufacturers won’t let it near their products.
A realistic room checklist
Before you order, walk the room with this list. Floor is hard and level, ideally slab. Ten by twelve or better, with clearance on the long side. Doorway and hallway wide enough for an eight foot shell. A licensed electrician has quoted a dedicated 220V GFI circuit. You have a humidity plan and a way to exhaust moist air. There’s a nearby drain or a workable plan for changing water. Your local permitting is understood.
Seven lines. If all seven check out, the install is uneventful. If two or three don’t, you’re better off knowing now.
Frequently asked questions
How much space does a home float tank need?
The tank itself is 96 by 60 by 29.5 inches, about forty square feet. Plan for a room around ten by twelve so you have clearance to walk the long side, open the lid, and dry off.
How much does a home float tank weigh when it’s full?
About 2,400 pounds filled, and 435 pounds dry. It holds 175 gallons of salt water. It has to sit on a hard, level surface, which is why basements and ground floors over slab are the usual choice.
Do I need special electrical for a float tank?
Yes. The Personal Float Tank requires 220V, 20 amp, three wire with ground and GFI protection on a Hubbell L14-30 receptacle or equivalent. That’s a dedicated circuit installed by a licensed electrician to your local codes.
Will a float tank make my house humid?
It will if you don’t plan for it. Proper in-room HVAC sized for the humidity is a requirement, not an upgrade. An exhaust fan vented outside or a dedicated dehumidifier handles most rooms.
Can I put a float tank on the second floor?
Only with a professional assessment. At roughly 2,400 pounds filled, an upper floor install needs a structural engineer or licensed contractor to evaluate the framing and confirm it meets local code.
How much does a personal float tank cost?
The Royal Spa Personal Float Tank is $9,100 as of August 2026 for the tub and mechanicals. Salt, extra filters, maintenance supplies, and freight are separate.
Come see one before you measure anything
Photographs flatten scale. People consistently picture a float tank as bigger than it is, then walk into the showroom and realize it fits where they thought a desk had to go. Come stand next to one. Bring your room dimensions and we’ll tell you honestly whether it works, including the times the answer is no.
If you’ve never floated at all, start with what a first float session is actually like. If you’re curious why the salt matters and why most equipment can’t handle it, read how Epsom salt and magnesium work in a float tank. And when you want the specs in front of you, the Personal Float Tank page has the full attribute table, alongside the rest of the Royal Spa float tank line.
