The Sauna Accessories That Matter, the Ones That Don't, and the One That Can Start a Fire
The Finnish word for the burst of steam that rises when you pour water on hot stones is löyly. It's worth knowing that the word originally meant spirit, breath, soul — it's cognate with the Hungarian lélek, meaning soul, and the Mansi läl, meaning life (Wikipedia).
Which tells you something about how the Finns think about a bucket of water. It isn't an accessory. It's the point.
Everything sold in the sauna accessories aisle is either serving that moment or distracting from it. Here's how to tell which is which — including one popular item that a fragrance manufacturer's own label warns about in capital letters.
Start Here: The Rock Pile Is the Whole Machine
If you buy one thing properly, buy the stones. Your heater's elements are just a way of getting rocks hot. The rocks are what make steam.
And they have to be the right rocks. Harvia's manual is specific: peridotite, olivine-dolerite, and olivine are suitable (Harvia manual). It's equally specific about what's banned — light porous ceramic "stones" and soft soapstones, because "they do not absorb enough heat" and "can result in damage to heating elements" (Harvia).
Now the part that should genuinely stop you: do not gather your own rocks from a riverbed. Smooth river stones are smooth because water has been working on them, which means water has been getting into them. Heat that trapped moisture and it turns to steam with nowhere to go. As one long-time sauna builder puts it, "if you're using rocks that allow for water to get in cracks, they will explode" (Sauna Times). Fragments can travel a few feet — roughly the distance to where your shins are (Ice & Cedar).
Stones aren't permanent either. Harvia says to restack them at least once a year and replace them every one to two years, or sooner if they've started to crumble or powder (Harvia). Crumbled stones pack together, choke off airflow, and slowly cook your elements.
One price note worth $100: the identical Harvia olivine diabase 20 kg box is $90 at Thermatov (link) and $190.95 at sauna.ca. Same rocks. Shop around.
The Bucket and Ladle, and the Rule Hidden in Your Manual
A wooden bucket and ladle looks like decoration. It's actually a dosing instrument, and there's a number attached to it that almost nobody knows.
From Harvia's own manual: "The maximum volume of the ladle is 0.2 litres." Go bigger, and "the rest may splash as boiling hot water on the bathers" (Harvia Club manual).
That's the difference between löyly and a scald. Water hitting rock at 200°C+ doesn't gently evaporate — it flashes, and whatever the stones can't take instantly comes back at you as boiling droplets. A small ladle isn't daintiness, it's physics.
Buy a bucket with a plastic or stainless liner. Bare wood in a hot, wet, dry-again cycle will eventually leak, and a liner also means you're not soaking raw timber in standing water between sessions. Expect around $55 for a 4 L bucket with insert and $35 for a cedar ladle (bsaunas).
One more manual rule while we're here: never use pool or chlorinated water. Harvia flags it as "forbidden" because "chlorine gas can be produced" (Harvia).
The Fire Hazard You've Probably Been Sold
This is the section I'd most like you to read.
Sauna fragrance oils are lovely and widely sold. They are also flammable, and there is exactly one correct way to use them.
The Rento scent bottles sold in Canada carry this instruction on the label, in caps: "NEVER use directly on rocks; ALWAYS dilute with water." The dose is three to six drops per scoop (Sauna Style, $9.95 for 10 ml).
The reason is straightforward. Essential oils vaporize and can ignite above roughly 50°C. Sauna stones sit "well over 200°C." Dripping concentrated oil onto them raises "the risk of deflagration" — a fast-spreading flame front (Kemitron).
Two further rules: use only products sold as sauna scents. Harvia's manual says "only special aromas designed for sauna water may be used" (Harvia). And never use carrier oils or synthetic essences (British Sauna Society).
Worth being honest that the experts don't fully agree here. The British Sauna Society argues that oil in the bucket is also a hazard, since oil floats and can arrive on the stones essentially undiluted. Kemitron considers alcohol-based scents the safest option, while another retailer calls alcohol on stones a serious fire risk. Given that spread of opinion, the conservative move is: sauna-specific product, well-stirred into the bucket, a few drops, never neat on the rocks.
Or use an aroma cup — a small vessel that hangs on the heater and evaporates scented water gently, away from direct stone contact. It sidesteps the whole argument.
The Genuinely Useful Bits
Thermometer and hygrometer. Buy the combined unit, around $50 (bsaunas). Temperature alone tells you very little — 80°C at 10% humidity and 80°C at 40% humidity are completely different experiences, and the second one will end your session much sooner than you expect. The hygrometer is what teaches you how much water your stones actually want.
A sand timer. Roughly $40, usually 15 minutes. This seems like the most ornamental object in the sauna and it's quietly one of the best. It gives you something to look at that isn't a phone, and it removes the decision-making from "should I get out now" — which, when you're pleasantly cooked, is a decision you make badly. Sand also doesn't mind the heat, which electronics do.
Backrest and headrest. About $65 for a backrest. Cedar slats sound like a luxury until you've spent twenty minutes with your spine against a hot vertical wall. The angle is the product.
Bench covers. The Finnish word is pefletti, and the etymology is charming: it's a mash-up of peffa (bum) and tabletti (placemat) (Wikipedia). Function: hygiene in a shared space, and a thermal buffer so you're not sitting directly on wood that's been absorbing heat for an hour.
A wool felt hat. The idea is that your scalp cooks faster than the rest of you, so insulating your head lets you stay in longer and more comfortably. I'll be straight with you: I could not find a single peer-reviewed study supporting it. But the mechanism is plausible, Finns and Russians have used them for generations, and they cost between $8 on Amazon.ca (link) and $60 for a nice one (Hats On). Low stakes either way.
Proper cleaner and no varnish. Get a dedicated sauna cleanser ($24.95, sauna.ca) and — this is the important half — never seal or varnish your benches. Finnish manufacturers are explicit about this (Finnleo). Sealant traps moisture, blisters off, and turns hot to the touch in a way bare wood doesn't.
Wooden door handles. A metal handle in a 90°C room is a branding iron. This isn't a style choice.
An adjustable vent. Underrated and nearly invisible. Airflow is what makes löyly feel soft and alive rather than stale and stifling. A sauna that feels somehow flat usually has a ventilation problem, not a heater problem.
The Tradition: Hitting Yourself With a Tree
The vihta — a bundle of leafy birch twigs, called a vasta if you're from eastern Finland, same object — is used to gently thrash your own back and shoulders. It sounds absurd. It is also the single most Finnish thing you can do in a sauna.
The birch releases its oils in the steam, the light impact brings blood to the surface, and the whole thing smells like a forest after rain. Dried whisks rehydrate in warm water; fresh ones are a summer luxury.
Nobody needs it. Everybody should try it once.
What to Skip, and What Can Hurt You
Candles. Sold as sauna accessories at around $50 (bsaunas). Consider what you're combining: an open flame, a small wooden room, and vaporized fragrance. Leave them in the change room.
Regular Bluetooth speakers. Consumer speakers are typically rated for 35–40°C. Sauna air runs 60–90°C. One sauna audio specialist calls putting them in the hot room "a genuine fire risk" (Saunageek). Mount the speaker outside and pipe the sound in.
LED strip lights. Same problem, plus a driver that was never designed for this. Keep the driver outside the room and use heat-rated fixtures only (Simply Secured).
Salt lamps. Pretty. The wellness claims attached to them have no support I could find.
Glass bottles. Bring water — dehydration is real — but bring it in something that won't shatter on a wooden floor while you're barefoot.
Drying laundry in there. People do it. It's a fire risk and it makes your sauna smell like a laundry hamper.
What It Costs to Kit Out Properly
A complete Canadian starter set, before tax:
Item | Price |
Olivine diabase stones, 20 kg | $90 (Thermatov) |
4 L bucket with insert | $55 (bsaunas) |
Cedar ladle | $35 |
Thermometer/hygrometer | $50 |
Sand timer | $40 |
Wool hat | $20 |
Backrest | $65 |
Sauna cleanser | $24.95 (sauna.ca) |
Sauna scent, 10 ml | $9.95 (Sauna Style) |
Total | ≈ $390 |
Against a heater and an electrician, that's noise. And it's the difference between a hot room and a sauna.
If You Only Take Three Things From This
Right stones, restacked yearly, and never from a river.
A 0.2-litre ladle, because your heater's manufacturer says so.
Never put oil straight on the rocks. Dilute it, or don't use it.
Everything else on the list is comfort, ritual, and pleasure — which, given that löyly once meant soul, is arguably the reason you built the thing.
Comments