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Bathhouses are having their moment, especially in Melbourne. Hot pools, cold plunges, steam rooms, a magnesium soak and a friend to talk to afterwards. It's the most social wellness has been in years, and the venues are full for good reason.
Float therapy sells the same promise (an hour of deep relaxation) and gets there by doing the opposite thing. Here's the honest comparison: what the research actually supports for each, why the mechanisms differ, what you're paying for, and which one matches what's depleted in you. We run float and we're not a bathhouse, so we've given the bathhouse side its full due.
Better than most people assume. The research field is called balneotherapy (therapeutic bathing, usually in warm mineral water), and it's been studied properly.
A multicentre randomised controlled trial published in BMC Complementary Medicine and Therapies found balneotherapy reduced stress, anxiety and depression, with benefits still measurable at 6-month follow-up. A systematic review and meta-analysis on balneotherapy and cortisol found measurable cortisol reductions. Warm water immersion activates the parasympathetic nervous system, reduces sympathetic activity, and appears to modulate the HPA axis (the system that governs your stress hormones).
So the hot pools are doing genuine physiological work, not just feeling nice. And there's a second benefit the studies rarely capture: bathhouses are social, and social connection is one of the better-evidenced inputs to long-term health there is. If your week has been isolating, that's not a side effect. That's the medicine.
Also good, and pointed at something different. Feinstein and colleagues 2018 (PLoS One) measured significant reductions in anxiety, stress, muscle tension and blood pressure after a single 1-hour float, with the largest effects in the most anxious participants. Swedish flotation research measured lowered cortisol across courses of floats. A 2023 systematic review of Flotation-REST found positive effects on pain, stress, mental wellbeing and clinical anxiety.
The mechanism is subtraction. Around 400kg of Epsom salt makes the water dense enough that you float with zero effort and zero load on the spine. The water sits at skin temperature and the air is matched to it, so the thermal boundary disappears. No light, no sound, nobody else. Your nervous system gets an hour with nothing to monitor.
This is the whole comparison in one line. A bathhouse adds pleasant input until you relax. A float removes input until you relax.
That distinction decides which one suits you, because it maps onto what kind of stress you've actually got.
The modern default is overstimulation: screens, noise, notifications, people, decisions, a brain that hasn't had a quiet minute since Tuesday. If that's the problem, a warm pool in a beautiful room with music and conversation is lovely, and it's still input. You're relaxing while your nervous system keeps processing. Float is the version where the processing stops.
But if what's depleted is connection (a flat, isolated, spoken-to-nobody-all-week feeling), then an hour alone in a dark pod is the wrong prescription and the bathhouse is right. We say the same thing in our comparison of group recovery vs private recovery.
This part surprises people. Casual bathhouse entry in Melbourne generally lands in a similar range to a single float session, and both drop on memberships and packs. At Beyond Rest a float is $89 casual and comes down toward $55-65 on packs and memberships (see prices and memberships). Check any bathhouse's casual rate against that and the gap is usually small.
So if the money is similar, the useful question is what the money buys. 2 things differ.
You get the room to yourself. A float is 1 person, 1 pod, 1 private room with your own shower. A bathhouse is a shared space by design, which is the point if you're there for the atmosphere and the trade-off if you're not.
The water works differently. Float water carries a very high concentration of dissolved magnesium sulphate, and that salinity alone makes the water hostile to most bacteria. On top of that the water is filtered and UV-treated between every single session. The comparison worth knowing: public pool and spa regulations typically require the full body of water to pass through filtration once every several hours, while float tank water passes through filtration multiple times between each person. Different volumes, different engineering, and a genuinely different starting point when you get in.
None of that makes a well-run bathhouse unsafe. Australian venues operate under public health regulations and the good ones take water quality seriously. But if the thought of shared water is what's been putting you off, float is the version of this where the question doesn't arise.
Worth separating out, because it's the most valuable thing in most bathhouses and plenty of visitors skip it.
If you're alternating hot pools with a cold plunge, you're doing contrast therapy, and that has its own research base: a vascular pump from the dilation and constriction cycle, plus a sharp norepinephrine response from the cold that lifts mood and alertness for hours. If you're only sitting in the warm pools, you're getting the thermal and social benefits and leaving the contrast benefit in the water.
Our contrast therapy guide covers the protocols, and we run it in private rooms where the ice bath is filled for your session and drained after, which is a different proposition to a shared plunge pool.
Honest answer: courses of either appear to hold, and single sessions differ.
The balneotherapy trial with 6-month follow-up shows a course of thermal bathing produces durable change, so the idea that bathhouse benefits vanish by dinner is wrong. What people do report is that a single bathhouse visit feels wonderful and fades faster.
Float's single-session effect seems to carry further, and there's a mechanism worth understanding. The float itself produces the parasympathetic shift and the cortisol drop. What happens next is the part most people miss: that downshift appears to follow you into the night. On the client wearables we get shown (Oura, Whoop, Garmin), floats produce the biggest REM sleep improvement of any session we run. REM is the stage where the brain does its emotional processing, so a REM-heavy night after a float is a plausible reason floaters so consistently describe a steady, lifted mood for 2 or 3 days rather than 2 or 3 hours.
Being straight about the status of that: the single-session research is solid, the cortisol data is solid, and the multi-day carry-over is our own observational data plus a mechanism rather than a clinical trial. Long-term float studies are still being done. Test it on your own tracker across 2 or 3 sessions and you'll have your own answer, which is more useful than ours.
Pick by the outcome you're actually after.
Choose a float if your anxiety is high and you need to properly switch off. This is the clearest case. Feinstein 2018 found the largest reductions in anxiety, stress and muscle tension in the most anxious participants, which is the opposite of how most relaxation works: the more wound up you are, the more there is to give back. A bathhouse can't take away the input that's keeping you wound up, because a bathhouse is input.
Choose a float if you want the perspective shift. The thing floaters describe most often isn't feeling relaxed. It's coming out and finding that the problems they walked in with have shrunk. Same problems, different proportions. An hour with nothing to react to seems to give the brain room to file things differently.
Choose a float if you need the days ahead to be good ones. If you've got a heavy week coming and you want the downtime to actually pay for itself, the next-day effect is the reason to float rather than soak. The mood lift and the REM-heavy night are what carry into Monday, which is why our regulars tend to book floats before big weeks rather than after hard ones.
Choose the bathhouse when you want warmth, company and a slow half-day. If the week has been isolating, or you want to bring a friend, or you just want to sit in hot water and talk, that's a genuinely good use of the same money. And use the cold plunge while you're there.
Do both if you can. Bathhouse for the warmth and the people, float for the depth and the reset. Plenty of our regulars alternate depending on the week they've had.
One line worth adding: floating is a wellness modality, and diagnosed anxiety or depression belongs with a GP or psychologist. Plenty of our clients do both, and the float supports the work rather than replacing it.
"The bathhouse boom is good for everyone in wellness, and we send people to them. What we do is the opposite operation: they add lovely stimulus until you relax, we take all of it away. Different tool for a different kind of tired," says Nick Dunin, founder of Beyond Rest.
Both have real evidence. Balneotherapy (therapeutic bathing) has randomised trial support for reducing stress, anxiety and depression with benefits at 6-month follow-up, plus measured cortisol reduction. Float has measured reductions in anxiety, stress and muscle tension after a single session (Feinstein 2018) and lowered cortisol across courses. Bathhouses add pleasant stimulus; float removes stimulus. Pick by whether your stress is overstimulation or isolation.
Float, on the current evidence. Feinstein 2018 measured the largest reductions in anxiety, stress and muscle tension in the most anxious participants, and the mechanism is removing input rather than adding it, which matters when overstimulation is what's driving the anxiety. Diagnosed anxiety still belongs with a GP or psychologist; floating supports that work rather than replacing it.
Yes. A systematic review and meta-analysis of balneotherapy found measurable cortisol reductions, and warm water immersion activates the parasympathetic nervous system while reducing sympathetic activity. The hot pools are doing real physiological work.
Usually about the same. Casual bathhouse entry in Melbourne generally sits in a similar range to a single float, and both reduce on memberships. A float at Beyond Rest is $89 casual, dropping toward $55-65 on packs and memberships. For similar money, a float buys a private room and water that isn't shared.
A single bathhouse visit tends to feel wonderful and fade faster, while courses of thermal bathing show durable benefits at 6-month follow-up in trial data. Float's single session appears to carry further: client wearables consistently show the biggest REM sleep improvement of any session we run, and floaters commonly report a lifted mood for 2 to 3 days. The single-session and cortisol research is solid; the multi-day carry-over is observational plus mechanism, so test it on your own tracker.
A bathhouse is a social, sensory-rich environment: hot pools, steam, often a cold plunge, other people. A float tank is a private, light-proof, sound-proof pod with 400kg of dissolved Epsom salt at skin temperature, removing nearly all sensory input including gravity. One adds input, the other subtracts it.
The very high magnesium sulphate concentration makes float water hostile to most bacteria, and the water is filtered and UV-treated between every session, passing through filtration multiple times between users. Public pools and spas typically turn their full water volume over once every several hours by comparison. Every float at Beyond Rest is also a private room, so nobody shares your session.
No. Every session runs in a private room, one person at a time, with your own water. If you want the communal bathhouse experience, Melbourne and Perth both have excellent ones and we're happy to point you at them.
If you're comfortable with cold, yes. Alternating hot and cold is contrast therapy, which has its own research base for circulation, recovery and a mood-lifting norepinephrine response. Sitting only in the warm pools leaves that benefit on the table.
They complement each other well: the bathhouse for warmth and company, float for depth and quiet. Many of our regulars alternate depending on what kind of week they've had.
If you've done the bathhouse rounds and your head still won't switch off, that's exactly what a float is for. Float therapy Melbourne and Perth.