Sauna wood in Dubai gets tested harder than the species data sheet suggests. The cedar, hemlock, and aspen panels you see in a Helsinki spec sheet are rated for a climate where ambient humidity sits between 40 and 70 percent for most of the year and where saunas typically run for three or four months of intensive use. Dubai delivers something different. Coastal humidity climbs above 90 percent for weeks at a time, indoor air conditioning runs constantly, and the sauna itself runs year-round rather than seasonally. The wood you choose, and how you finish, ventilate, and service it, determines whether your sauna stays a 15-year asset or becomes a 5-year sauna repair Dubai callout.
Sauna use across Dubai has grown substantially over the past three years, driven partly by increased awareness of heat therapy research. Cardiovascular benefits documented in the Laukkanen et al. 2015 JAMA Internal Medicine paper, and heat protocol guidance from Andrew Huberman on the Huberman Lab podcast, have moved sauna ownership from a niche purchase into a more mainstream wellness investment. That growth has produced more first-time sauna owners across the UAE and more people facing wood-related issues without prior experience to draw on. This guide is for them.
This guide walks through the three woods that dominate residential and commercial sauna construction in the UAE: Western red cedar, Canadian hemlock, and Nordic aspen. It explains how each species actually performs in Dubai conditions, what early failure looks like, what species to specify for which use case, and what it costs to refurbish or replace panels when the wood eventually gives way. None of the patterns below are theoretical. They are what the Euphorium sauna repair Dubai team finds in service calls across Dubai Marina, JBR, Palm Jumeirah, Downtown, JLT, Emirates Hills, and the wider Abu Dhabi corridor.
Why Sauna Wood Choice Matters Differently in Dubai
In a Nordic climate, sauna wood selection is mostly a comfort decision. All the major species (cedar, hemlock, aspen, alder, basswood) survive a Finnish or Swedish service life with predictable results, so the conversation centers on aroma, color, and feel under bare skin at 90 degrees Celsius. In Dubai the calculation flips. Wood selection is mostly a durability decision, with comfort as the secondary filter. The species that stays straight, holds its color, resists mold, and cycles cleanly between high humidity and aggressive air conditioning is the one that earns its place over a 10 to 15 year ownership. The species that splits, blackens, or warps within two summers is the one that turns into a refurbishment line item before it has finished paying back its installation cost. For Dubai homeowners commissioning a new sauna, getting the wood specification right before the build matters more than almost any other decision.
There are four climate stresses unique to the UAE that European sauna wood guides rarely cover. The first is sustained ambient humidity. Coastal Dubai, including Marina, JBR, Palm, and Bluewaters, sits at 70 to 95 percent relative humidity for most of summer. Wood absorbs moisture from this air every hour the sauna is not running, then drives it back out when the heater fires. Repeated absorption and desorption cycles loosen fibres, open grain, and accelerate the dimensional movement that causes splits and cupping.
The second stress is the indoor air conditioning gradient. Dubai homes typically run interior air at 21 to 23 degrees Celsius. A sauna chamber heats from this baseline to 85 to 95 degrees Celsius and then cools back down within a few hours of the session ending. That is a 65 to 70 degree thermal swing, several times a week, sometimes daily. Each swing is a stress cycle that traditional Nordic guidance assumes happens far less often.
The third stress is salt-laden air for coastal properties. Saline aerosol corrodes the metal hardware (hinges, screws, vent grilles) and slowly attacks the wood directly at the panel edges where end-grain absorbs moisture fastest. Properties within roughly three kilometres of the shoreline see the salt effect most clearly.
The fourth stress is hard water. Dubai municipal water carries dissolved minerals that deposit visibly within months on any wood surface that gets splashed during wet sessions. The mineral film is mostly cosmetic, but where it builds up at corners and joints it can hold moisture against the wood and create persistent damp pockets that promote mold and panel rot.
These four stresses combine to compress the rated service life of any sauna wood by a meaningful margin. The same panel that lasts 25 years in Helsinki may need attention at year 8 to 12 in coastal Dubai. That is not a defect. It is the climate doing what climate does. The right wood choice and the right preventive servicing schedule move that timeline back out.
Western Red Cedar in Dubai Saunas
Western red cedar (Thuja plicata) is the sauna wood most people picture when they think of an upmarket cedar interior. It is the warm reddish-brown timber, with a strong characteristic aroma when first heated, sourced primarily from British Columbia and the Pacific Northwest. Its commercial appeal in the UAE is partly visual (the color reads as premium) and partly chemical (the natural extractives in the wood inhibit fungal growth and resist insect attack).
Cedar’s strengths in Dubai are real. The wood has natural rot resistance that holds up well even in coastal humidity, the aroma in a freshly built cedar sauna is unmistakable for the first 18 to 24 months of use, and the timber is dimensionally stable enough to handle the thermal swings without significant cupping in most installations. Cedar also has a low thermal conductivity, which means panels stay touch-comfortable at temperatures where harder hardwoods can feel hot enough to flinch from on bare skin.
Cedar’s weaknesses are also real, and several of them show up specifically in Dubai conditions. The aromatic oils that give cedar its character also make the wood more reactive to sustained UV exposure if any direct sunlight reaches the panels through a glass door or skylight. UV-faded cedar reads as silver-grey rather than red within a couple of years of heavy exposure, and the bleached zones never fully recover their original color. Cedar is also softer than hemlock or aspen, so panel edges, bench faces, and door frames show wear marks earlier in commercial settings where the wood gets hit by towels, water buckets, and the occasional dropped accessory.
The single biggest cedar issue we see during sauna repair Dubai service calls is splash-zone darkening near the heater. Cedar absorbs water poured during löyly (the Finnish term for the steam burst) and the constant wet-dry cycling at the splash zone produces dark watermarks within a year. These watermarks are cosmetic but they are nearly impossible to remove without sanding the panels back to fresh wood. Owners who care about aesthetic uniformity should specify a slightly larger splash guard or a bench-and-stone shielding detail at installation time to reduce the affected area.
Cedar is best specified for residential dry saunas in non-coastal locations where humidity is the primary concern but salt aerosol is not, or for indoor commercial saunas where the visual premium of the timber justifies a slightly more aggressive maintenance schedule. Properties in JLT, Business Bay, Arabian Ranches, Mirdif, and similar inland communities tend to do well with cedar at 8 to 12 year refurbishment intervals.
Canadian Hemlock in Dubai Saunas
Canadian hemlock (Tsuga heterophylla) is the workhorse of the global sauna industry. It is the wood you find in most off-the-shelf prefabricated sauna kits, in commercial gym installations, and in many high-end residential builds where the owner wanted a neutral, even-toned interior rather than the strong color of cedar. Hemlock is light beige to pale pink in fresh condition and ages slowly to a warmer honey tone under heat exposure. It has almost no characteristic aroma when heated, which suits owners who find the cedar smell overwhelming or who want to avoid potential allergy concerns.
Hemlock’s strengths in Dubai are twofold. First, the wood is denser and harder than cedar, so panel edges and bench faces hold up better in commercial use. Hotel saunas, gym saunas, and high-traffic residential saunas all benefit from the harder surface. Second, hemlock is dimensionally stable enough that its movement under thermal cycling is predictable and small, which means joints stay tight and panels do not bow outward over time the way some softer species can.
Hemlock’s weaknesses are different from cedar’s but equally important to plan for. The wood has lower natural rot resistance than cedar, which means hemlock saunas in coastal humidity require more attentive ventilation between sessions and more aggressive prevention of standing water at floor and bench edges. A hemlock sauna with a chronically damp floor will develop staining and eventually surface rot at the bottom edge of wall panels several years before a cedar sauna in the same room would show similar damage.
The second hemlock issue is staining from heater stones and water minerals. Light-colored woods show every mineral deposit, every spilled essential oil, every tea-tree mark from a careless löyly water. The wood is forgiving structurally but visually unforgiving. Owners who want the clean Nordic aesthetic that hemlock provides need to commit to a sanding refresh every three to five years, or they need to accept that the panels will accumulate a patchwork of marks that contradicts the original spec.
The third hemlock factor is that the wood interacts poorly with certain industrial-strength cleaners that are common in commercial settings. Bleach-based or strong alkaline cleaners cause discoloration and grain raise on hemlock that cedar would shrug off. Commercial sauna operators must specify wood-safe cleaning protocols at handover or risk visible damage from the very first deep clean.
Hemlock is best specified for commercial saunas (hotels, gyms, spas) where uniform color is preferred and where a predictable maintenance schedule with periodic sanding is built into the operating budget. It also suits residential clients who want a clean, modern Nordic look and are willing to commit to ventilation discipline. Most of the prefabricated sauna kits used across Dubai installations are hemlock-based, which is part of why we see hemlock far more often than cedar during routine service work.
Nordic Aspen in Dubai Saunas
Aspen (Populus tremula) is the third common sauna wood, and the one that performs most distinctively in Dubai humidity. Aspen is a very pale, almost white-cream timber with a fine even grain and almost no visible knots when properly graded. It has no aroma when heated and an unusually low resin content, which means the wood does not bleed sap, does not yellow significantly under heat, and stays cool enough on bare skin that bench-top aspen is the gold standard for high-temperature Finnish-style saunas where the air can sit above 100 degrees Celsius.
Aspen’s first strength is dimensional stability. Of the three woods covered here, aspen has the lowest tendency to cup, twist, or split under thermal cycling. In a Dubai climate where panels see significant moisture absorption and desorption every week, that stability translates directly into panels staying flat and joints staying tight for longer.
Aspen’s second strength is its low thermal mass and conductivity. The benches in a hot sauna are the first place owners notice wood performance. Cedar can feel sticky from extractives. Hemlock can feel hot in a high-temperature room. Aspen stays smooth and touch-comfortable even at 100 degrees Celsius, which is why traditional Finnish sauna builders default to aspen for benches even when the wall panels are something else.
Aspen’s weaknesses in Dubai conditions are the trade-off side of its very pale color. The wood shows every mark. A drop of essential oil leaves a permanent ring. A child’s hand mark with sunscreen still on the palm leaves a visible print after the next session. The fine grain that gives aspen its smooth feel also accepts dirt and skin oils into the surface in ways that cedar and hemlock do not. Owners who specify aspen for visual reasons rather than functional ones often regret the choice within the first year.
Aspen also has lower natural rot resistance than cedar, although it tends to perform better than hemlock in damp conditions because of its lower extractive content (mold has less to feed on). The species needs strong ventilation discipline in coastal Dubai locations and benefits significantly from a brief wipe-down after each session to remove sweat and any pooled water at the bench seam.
Aspen is best specified for serious Finnish-style saunas where bench performance matters most, for high-end residential builds where the owner is committed to careful use, and as a mixed-wood choice (aspen benches in a hemlock or cedar wall envelope) where the bench is the only surface that needs the very-low-conductivity property. We see aspen most often in Emirates Hills, Palm Jumeirah, and the higher-end Marina addresses where sauna specifications come from buyers who already understand traditional Finnish sauna practice.
Side-by-Side: How the Three Woods Compare in Dubai Conditions
A direct comparison clarifies which species fits which job. The three woods perform differently across the four Dubai stress factors, and the right choice depends on the property type, the use pattern, and the owner’s tolerance for visible aging.
For coastal humidity resistance, cedar leads because of its natural rot-resistant extractives, hemlock sits second when ventilation is well managed, and aspen sits third unless the bench-only mixed-wood approach is used. For thermal cycling stability, aspen leads because of its very low movement coefficient, hemlock sits second with predictable behavior, and cedar sits third with somewhat more dimensional drift over time. For wear in high-traffic commercial settings, hemlock leads because of its harder surface, aspen sits second for benches specifically, and cedar sits third because of its softer fibre. For visual longevity, cedar leads if owners accept gradual color change, hemlock sits second if regular sanding is scheduled, and aspen sits third because the pale surface shows every mark immediately.
The pricing structure in the UAE roughly tracks the same hierarchy. Hemlock is the most common and most cost-efficient option for a standard sauna build because of supply availability through prefabricated kit suppliers. Cedar carries a 20 to 35 percent premium for the visual upgrade and the rot resistance. Aspen carries a 30 to 50 percent premium where it is specified for benches or for full-room aspen builds, with the variation depending on grading (clear-grade aspen with no knots commands the highest price). These ranges are indicative, and final pricing depends on supplier, grade, and the volume of timber the project requires.
Signs Your Sauna Wood Needs Attention
Most Dubai sauna owners do not think about their sauna wood until something visibly wrong appears, by which point the underlying issue has usually been progressing for months. There are five early warning signs worth knowing.
The first sign is panel discoloration that is not uniform across the room. Even cedar weathers evenly when ventilation is balanced. Patchy darkening, particularly at the lower wall panels, near the floor, or directly under the bench, signals localized damp pockets. The early-stage fix is improved ventilation and a wood-safe surface clean. The late-stage fix is panel replacement in the affected zone.
The second sign is a noticeable smell change. A sauna that previously had no smell but now carries a stale, slightly sour note when first heated has wood absorbing moisture and beginning to support microbial growth. This is recoverable with a deep clean and a few cycles of high-temperature drying, but only if caught early.
The third sign is bench creak or visible sag. Bench seams should be tight and silent. Any movement, especially under load, is signaling that fasteners have loosened (often because of repeated thermal cycling working the wood around the screws) or that the panels supporting the bench have begun to soften at the contact points.
The fourth sign is door seal failure that pairs with door frame distortion. A sauna door that no longer closes flush, or a gasket that no longer compresses evenly, is sometimes the gasket itself, but it is often the door frame timber that has moved out of true. Frame distortion accelerates if the wood is allowed to keep cycling against an ill-fitting door because the gap forces uneven heat exposure on the surrounding panels.
The fifth sign is a creeping increase in heat-up time that the sauna repair Dubai team has already ruled out at the heater, sensor, and controller level. When a heater is healthy and the chamber still takes longer to reach temperature than it used to, the most common explanation is heat loss through degraded insulation behind the wall panels or through a door gap that has opened up because of frame movement. The wood is the symptom surface rather than the failed component, but it is still where the diagnosis ends.
The Euphorium sauna repair Dubai service includes a wood inspection as part of the standard diagnostic visit. Early intervention on wood issues prevents more expensive repairs later, and in many cases prevents an avoidable full panel replacement.
Refurbishment vs Replacement: How to Decide
When wood damage is identified, the next question is whether to refurbish (sand, treat, and reseal where appropriate) or replace (strip out the affected panels and install new). The decision depends on three factors.
The first factor is the depth of damage. Surface marks, mineral staining, and light watermarks are usually sandable. Deeper damage, including localized rot, splits that go through the panel, or warping that has pulled panels out of plane, generally cannot be sanded out and requires replacement of the affected pieces.
The second factor is the proportion of the room affected. Up to roughly 20 percent of the visible panel area being damaged usually justifies a refurbishment approach, with replacement of the worst pieces and sanding-and-treatment of the rest. Damage above 30 to 40 percent of the room usually pushes the decision toward a full re-panel because matching new wood to old wood across more than that percentage of the visible area produces an uneven aesthetic that most owners find less acceptable than a clean rebuild.
The third factor is the age of the sauna and the underlying condition of the framing and insulation behind the panels. A 12-year-old sauna with damaged panels often has insulation that has compressed, framing that has loosened, and electrical runs that have aged. A full re-panel in that situation is the wrong call if the rebuild does not address the layers behind the wood. A partial refurbishment paired with a full electrical and insulation review may make more sense, or the owner may prefer to plan a complete sauna rebuild on a longer timeline.
Refurbishment costs in Dubai run AED 1,500 to AED 4,000 for a standard residential sauna depending on the extent of sanding and the treatment specification. Full panel replacement runs AED 8,000 to AED 25,000 for a standard residential room depending on wood species, grade, and access conditions. Commercial replacements run substantially higher because of larger room sizes and the additional labor for working in occupied facilities. The Euphorium sauna installation Dubai team quotes refurbishment and replacement separately so owners can compare like with like before deciding. A mid-life sauna in Dubai often gets the most cost-effective outcome from a hybrid: refresh the panels you can, replace the ones you cannot, and bring the heater, sensor, and controller in on the same visit if any of those are also approaching service age.
Maintenance That Extends Sauna Wood Life in Dubai
The single highest-impact maintenance practice for sauna wood in Dubai conditions is post-session ventilation. Leaving the door open for 30 to 60 minutes after every session lets residual moisture exit before it can soak into panel surfaces or settle into joints and corners. Combined with a brief towel-down of any visible water on benches and floor, this single habit extends sauna wood life by several years over a sauna that gets shut down and sealed immediately after use.
The second highest-impact practice is annual wood-specific maintenance. Cedar benefits from a light sanding every two to three years to remove surface watermarks and refresh the natural color. Hemlock benefits from a sanding refresh every three to five years for the same reason. Aspen, where used, benefits from a wipe-down after every session to remove skin oils and sweat residues that would otherwise stain the surface. None of these routines require specialist tools beyond a fine-grit sanding sponge and a wood-safe sauna cleaner.
The third practice is humidity management between sessions. A sauna that sits idle for weeks in a high-humidity coastal property may benefit from a brief weekly heat cycle (15 to 20 minutes at 60 degrees Celsius) to drive out absorbed moisture from the wood. This is particularly relevant for second homes and rental units where the sauna is not in regular use.
The fourth practice is appropriate cleaning. Wood-safe sauna cleaners use mild surfactants and avoid bleach, ammonia, and strong alkalis. The wrong cleaner causes more damage in a single deep clean than years of normal use would produce, and the damage is typically permanent.
The fifth practice is annual professional inspection paired with the heater service. Wood, electrical, mechanical, and ventilation systems all interact, and a single inspection that addresses all four catches problems while they are still small. Owners who take this approach spend less on their sauna over a 15-year life than owners who address each problem reactively after a failure. Annual inspection visits are part of how the Euphorium services catalog is structured for sauna owners across Dubai and the wider UAE.
Specifying Wood for a New Sauna Build in Dubai
For owners commissioning a new sauna build, the wood specification decision can be made cleanly with a few questions.
If the priority is the visual premium of warm reddish timber and the property is inland, specify cedar walls and either cedar or aspen benches. If the sauna will see commercial-style daily use or is installed in a coastal location with high salt exposure, hemlock walls with aspen benches is the more durable specification and the easier one to maintain over time. If the priority is a serious Finnish-traditional sauna experience, with the heat and bench performance to match, specify aspen throughout, accept the maintenance commitment, and pair it with strong ventilation. If the priority is value engineering for a rental property or a commercial portfolio, hemlock walls with hemlock or aspen benches gives the most predictable cost-per-year performance.
For all three species, the grade specification matters as much as the species itself. Clear-grade panels (no visible knots) cost more but are more dimensionally stable and look cleaner over time. Knotty-grade panels carry visible character but may develop small splits at knot positions over the years. The right choice is dictated more by the building aesthetic than by performance, but owners specifying for visual longevity should default to clear-grade for cedar and hemlock and accept knotty-grade only for aspen, where the knot character is part of the species’ visual identity.
Installation quality matters more than species choice in many cases. A poorly ventilated sauna built from clear-grade cedar will fail before a well-ventilated sauna built from knotty hemlock. The Euphorium ice bath installation Dubai and sauna build team specifies ventilation, vapor management, and panel detailing as part of every new build, and matches the wood spec to the property type rather than defaulting to whatever the prefab kit supplier ships by default. Owners commissioning a new build should ask their installer the same questions: what species, what grade, what ventilation strategy, and what maintenance schedule for the first 5 years.
What This Costs in Dubai
For owners weighing a refurbishment, replacement, or new build, the AED ranges below give a working estimate. All ranges assume Dubai metro pricing and a standard residential sauna of 4 to 8 square metres.
A diagnostic visit to inspect existing sauna wood, identify damage, and provide a written refurbishment vs replacement recommendation runs at the standard AED 300 service call rate. The diagnostic fee is fully deducted from the cost of any work performed during or after the visit.
Refurbishment work, including light sanding, treatment of stained or watermarked panels, and replacement of small areas of damaged panel, runs AED 1,500 to AED 4,000 for a standard residential sauna.
Full panel replacement runs AED 8,000 to AED 25,000 for a standard residential sauna, depending on the wood specified and the access conditions in the property. Commercial replacements run higher because of larger rooms and operational coordination requirements.
A new-build residential sauna runs AED 3,000 to AED 20,000 in Euphorium’s published range, with wood specification being one of the larger cost variables. Commercial new builds run AED 250,000 to AED 580,000 depending on size, finish, and integration into the surrounding facility.
Annual maintenance, including the inspection, light cleaning, mineral descale of any heater stones, and a basic ventilation check, runs AED 300 to AED 600 depending on access and total time on site. Owners who book annual maintenance proactively have markedly fewer call-outs for emergent failures, and the cumulative cost over a 10-year ownership is meaningfully lower than reactive repair pricing.
These AED ranges are indicative and depend on final scope. The Euphorium sauna repair Dubai team scopes every job during the diagnostic visit before any committed price is given.
FAQ
What is the best sauna wood for Dubai humidity?
For most Dubai homeowners, hemlock is the most cost-effective and durable choice because it handles thermal cycling well, holds dimensional stability, and is easy to source in good grades through UAE prefabricated kit suppliers. Cedar is the better choice for owners who prefer the warmer color and aroma and who are not in a coastal location where salt aerosol is a factor. Aspen is the right choice for benches in any sauna and for full-room builds where the owner wants serious Finnish performance and is willing to commit to careful maintenance.
How long does sauna wood last in Dubai compared to Europe?
European sauna wood service life of 20 to 25 years compresses to roughly 8 to 15 years in Dubai depending on species, location (coastal vs inland), use pattern, and maintenance discipline. The compression is not a defect; it is the climate. Strong ventilation, annual servicing, and light periodic sanding keep panels closer to the upper end of that range. Reactive maintenance and poor ventilation push panels toward the lower end.
Can I refurbish my sauna wood instead of replacing it?
Yes, in most cases. Surface marks, mineral staining, and light watermarks sand out cleanly. Deeper damage, including rot, splits through the panel, or warping that pulls the panel out of plane, requires replacement of the affected panels. The decision is best made during a diagnostic visit where the technician can identify which damage is sandable and which is not. Refurbishment runs AED 1,500 to AED 4,000 for a standard residential sauna.
How much does sauna wood replacement cost in Dubai?
Full panel replacement runs AED 8,000 to AED 25,000 for a standard residential sauna depending on wood species (hemlock cheapest, aspen most expensive), grade (clear-grade carries a premium over knotty), and access conditions in the property. Commercial replacements run substantially higher because of larger room sizes and the additional labor for working in occupied facilities like hotels, gyms, and spas.
Who repairs sauna wood damage in Dubai?
The Euphorium team handles sauna wood repair, refurbishment, and full panel replacement across Dubai and the wider UAE, including coastal areas (Marina, JBR, Palm Jumeirah, Bluewaters) and inland communities (Emirates Hills, Arabian Ranches, JLT, Mirdif, Mudon). The standard process is a diagnostic visit at AED 300 to scope the work, followed by a written quote covering refurbishment options, replacement options, and any related electrical or mechanical work that should be addressed at the same visit. Reach the team on WhatsApp at +971 58 517 0161 or via the services page on the Euphorium site.
Does sauna wood choice affect heater life?
Indirectly, yes. The wood choice affects how well the room holds heat, how well it ventilates between sessions, and how much moisture sits against the heater’s surrounding components. A poorly performing wood envelope (warped panels, gapped door, wet floor) forces the heater to work harder and run longer to reach temperature, accelerating element wear and shortening heater service life. The relationship runs in both directions: a healthy heater paired with healthy wood lasts longer than either component would in isolation. This is why annual inspections cover both at the same visit.
Is cedar safe for use in saunas given the natural oils?
Yes, when properly grade-selected and installed. The aromatic oils in cedar are part of what gives the wood its character and rot resistance, and they pose no health concern at sauna operating temperatures for the vast majority of users. A small minority of users with cedar-specific allergies report sinus or skin sensitivity, in which case hemlock or aspen are the recommended alternatives. Owners with known sensitivities should discuss the wood spec with the installer before commissioning the build.
How often should sauna wood be inspected in Dubai?
Annually, paired with the heater service. A single annual visit covers the wood inspection, the heater, sensor and controller check, the ventilation review, and any minor cleaning or descaling that prevents larger issues from developing. This combined inspection runs AED 300 to AED 600 and is the most cost-effective preventive maintenance available to Dubai sauna owners. Properties in coastal locations with high salt or humidity exposure may benefit from a six-month inspection schedule rather than annual.
If your sauna is showing any of the early warning signs above, or if you are commissioning a new build and want a wood specification matched to your property type, reach the Euphorium sauna repair Dubai team on WhatsApp at +971 58 517 0161 or via the ice bath rental Dubai page if you are exploring a try-before-you-buy approach. Diagnostic visits are AED 300 and the fee is fully deducted from the cost of any work performed.
External references: Laukkanen et al. 2015 JAMA Internal Medicine on cardiovascular benefits of regular sauna use, and the WHO drinking water quality guidelines covering hardness and total dissolved solids relevant to sauna stone and steam-generator scale.