The Sauna Glossary
A comprehensive A-to-Z reference for sauna terminology, covering heater technology, sauna types, construction, accessories, and the brands behind today's most respected equipment. Whether you're planning your first home sauna or you've been bathing for decades, this glossary is built to give you straight, accurate definitions you can rely on.
Maintained by the team at SaunaHeaters.com
Aspen
A light-colored hardwood with low resin content, commonly used for sauna bench tops because it stays cool to...
Aufguss
A German sauna ritual where a sauna master pours scented water on the stones and uses a towel to circulate...
Backrest
A vertical wooden panel attached to the wall behind a sauna bench, providing a cooler surface for the back...
Barrel Sauna
A cylindrical, barrel-shaped outdoor sauna typically made from staved wood, designed for efficient heat...
Bench Layout
The arrangement of seating tiers inside a sauna, designed to position bathers at the appropriate height for...
Bench Tier
A horizontal seating level inside a sauna, with most saunas having two or three tiers at different heights.
BTU
British Thermal Unit, a measurement of thermal energy used to rate the heat output of wood-burning sauna...
Built-in Thermostat
A temperature control mechanism integrated into a sauna heater that maintains the room at a set target...
Cabin Sauna
A standalone sauna structure shaped like a small cabin or shed, distinct from the cylindrical barrel sauna...
Cedar
A naturally rot-resistant softwood, most commonly Western Red Cedar, widely used for sauna interiors,...
Chimney
A vertical flue that vents combustion gases from a wood-burning sauna stove to the outside.
Chimney Damper
A valve in a wood stove or chimney that controls airflow and combustion rate.
Class A Chimney
A solid-fuel chimney system rated and tested to UL 103 HT standards for high-temperature wood-burning...
Cold Plunge
A short immersion in cold water (typically 38 to 55 degrees Fahrenheit) used after a sauna session to...
Combi Heater
A sauna heater that combines traditional dry sauna heating with an integrated steam generator, allowing the...
Continuous Heater
A type of sauna heater designed to run for extended periods, used in commercial settings or by bathers who...
Contrast Therapy
The practice of alternating between heat exposure (sauna) and cold exposure (cold plunge or cool shower) in a...
Convection Heater
A sauna heater design where air circulates around the heating elements and stones, distributing heat through...
Cool-Down
The period between sauna rounds, spent outside the heated room to allow the body to return to baseline...
Cozy Heat
A wood-burning sauna stove brand designed for traditional and rustic sauna installations.
Digital Sauna Controller
An electronic control unit that manages heater temperature, session duration, and scheduling, often with...
Dressing Room
A small antechamber outside the sauna where bathers change clothes, store towels, and rest between rounds.
Duckboard
A slatted wooden floor mat placed inside the sauna for comfort underfoot and to allow water drainage.
Duty Cycle
The percentage of time a sauna heater operates within a given period, used to determine whether a heater is...
Electric Sauna Heater
A sauna heater that uses electrical resistance elements to heat stones and warm the room, the most common...
Essential Oils
Concentrated plant-derived oils, such as eucalyptus or pine, sometimes added to löyly water for fragrance.
Finnish Sauna
A traditional dry-heat sauna using a stove and stones, typically heated to 160 to 200 degrees Fahrenheit,...
Finnmark
A North American sauna brand specializing in custom-built and prefabricated infrared and traditional saunas.
Floor Drain
A drain installed in the sauna floor or adjacent shower area to remove water from sweat, löyly, and cleaning.
Glass Door
A tempered glass sauna door, often frameless, used for aesthetic appeal and to give a sense of openness in...
Harvia
A Finnish sauna heater manufacturer founded in 1950, one of the largest sauna companies in the world with...
Harvia Cilindro
A tall, cylindrical pillar-style electric sauna heater from Harvia, designed for premium residential and...
Harvia Club
Harvia's commercial-grade sauna heater series designed for high-traffic installations like gyms, hotels, and...
Harvia KIP
An entry-level wall-mounted electric sauna heater from Harvia, popular for small residential saunas.
Harvia Spirit
A Harvia electric heater series designed for residential saunas, with a contemporary cabinet and good löyly...
Harvia The Wall
A flat, panel-style Harvia electric sauna heater designed to mount flush against the wall for a minimalist...
Harvia Vega
A compact wall-mounted Harvia electric heater designed for small residential saunas, available in 2.3 to 9 kW...
Harvia Virta
A premium wall-mounted Harvia electric heater with high stone capacity and a refined design, available in...
Harvia Xenio
Harvia's line of digital sauna control panels for residential heaters, with WiFi-enabled and basic...
Header Beam
A structural wood beam used to span the top of door and window openings in a sauna's framing.
Heat Acclimation
The physiological adaptation that occurs with regular sauna use, allowing the body to tolerate heat more...
Heater Cage
A protective wood or metal enclosure around an electric or wood-burning sauna heater to prevent accidental...
Heater Guardrail
A protective wooden or metal barrier installed around a sauna heater to prevent accidental contact with hot...
Heating Element
The resistive coil or rod inside an electric sauna heater that converts electricity into heat.
Hemlock
A softwood with minimal odor and a light color, often used for sauna interiors where a neutral environment is...
HUUM
An Estonian sauna heater manufacturer known for minimalist Nordic design, large stone capacities, and the UKU...
HUUM Cliff
A wall-mounted HUUM electric heater featuring a distinctive triangular stone basket, available in 6 to 10.5...
HUUM CORE
A compact HUUM electric heater designed for smaller saunas, available in lower kilowatt ratings than the...
HUUM Drop
A wall-mounted HUUM electric heater with a sculptural curved profile, designed for small to mid-sized saunas.
HUUM Hive
A floor-standing HUUM pillar heater available as the Hive Mini, Hive 9 kW, Hive 12 kW, and Hive Heat...
HUUM Steel
A HUUM electric heater wrapped in stainless steel mesh that allows partial visibility of the stone column...
HUUM UKU
HUUM's signature sauna control system, a minimalist wall-mounted controller with WiFi integration through the...
Infrared Sauna
A sauna that uses infrared heaters to warm the body directly through radiant energy rather than heating the...
IP Rating
An ingress protection rating that indicates how well a sauna heater or accessory is sealed against solid...
kW Rating
The power rating of an electric sauna heater in kilowatts, the primary specification used to match a heater...
kWh
Kilowatt-hours, the unit of energy used to measure electricity consumption, relevant for estimating sauna...
Löyly
A Finnish word (pronounced roughly LOY-loo) for the burst of steam produced when water is poured on hot sauna...
Manual Controls
A non-digital sauna heater control system using mechanical knobs for temperature and a timer dial.
Modular Bench
A pre-built sauna bench section that can be moved or reconfigured rather than fixed permanently to the wall.
Narvi
A Finnish sauna stove manufacturer specializing in wood-burning heaters, including the popular NC and Kota...
Nordic Spruce
A light, pale wood traditionally used for Scandinavian saunas, especially in Finland and Sweden, valued for...
Off-Peak Sauna Use
Operating an electric sauna heater during off-peak electricity hours to reduce energy costs in areas with...
Olivine Sauna Stones
A type of dense igneous rock commonly used as sauna stones because of its high heat retention and resistance...
Open Hearth Sauna
A traditional sauna design where the wood-burning stove is open-topped without a chimney, similar to a smoke...
Outdoor Sauna
A standalone sauna structure built or placed outside the main dwelling, ranging from prefabricated cabins to...
Panelization
The process of installing tongue-and-groove wood panels on sauna walls and ceiling, the final interior finish...
Pillar Heater
A vertical column-shaped electric sauna heater designed to be placed in the middle of the room or against a...
Pre-Heating
The time required for a sauna to reach target temperature from a cold start.
Recovery Bench
A wider, deeper bench (often 24 to 30 inches deep) designed to allow a bather to lie down fully during a...
Remote Start
The ability to turn on a sauna heater from outside the sauna using a smartphone app, timer, or scheduled...
Round Sauna
A sauna built with a cylindrical or polygonal layout, including barrel saunas and panoramic-window models.
Sauna Bathing
The practice of using a sauna, including all the rounds of heat exposure, cool-down, and recovery.
Sauna Bucket
A small wooden or composite bucket used to hold löyly water in the sauna, typically paired with a ladle for...
Sauna Ceiling Height
The vertical distance from the floor to the ceiling of a sauna room, typically between 7 and 7.5 feet to...
Sauna Cleaning
The routine maintenance of a sauna interior to remove sweat residue, mineral buildup, and prevent mold growth.
Sauna Door
A specialized door designed for sauna rooms, typically tempered glass or wood with no metal latch on the...
Sauna Frequency
How often a person uses a sauna, with research suggesting cardiovascular benefits scale with weekly frequency.
Sauna Insulation
Mineral wool or fiberglass insulation installed in sauna walls and ceiling to retain heat and reduce energy...
Sauna Kit
A pre-cut, ready-to-assemble package of sauna components including walls, ceiling, benches, door, and heater.
Sauna Ladle
A long-handled scoop used to pour water from the bucket onto sauna stones to create löyly.
Sauna Lights
Heat and humidity-rated lighting fixtures designed for installation inside a sauna room.
Sauna Stones
Heat-retaining rocks placed on top of a sauna heater, used to store thermal energy and produce löyly when...
Sauna Subfloor
The base layer of a sauna floor, designed to handle moisture from sweat, löyly, and cooling-off splashes.
Sauna Suit
A loose, breathable cotton or linen garment worn in mixed or public saunas where nudity is not the norm.
Sauna Thermometer
A heat-rated thermometer mounted inside the sauna to display air temperature, often paired with a hygrometer...
SaunaLife
A North American manufacturer of prefabricated outdoor saunas, including barrel, cabin, and cube-style...
SaunaLife CUBE Series
SaunaLife's lineup of modern cubic-shaped outdoor saunas with flat roofs and panoramic glass fronts.
SaunaLife ERGO Series
A SaunaLife outdoor sauna series featuring ergonomic interior bench layouts and a more traditional cabin...
SaunaLife GARDEN Series
Compact SaunaLife outdoor saunas designed to fit smaller backyards, patios, and garden spaces.
SaunaLife RAIN Series
A SaunaLife outdoor sauna line featuring weather-resistant design elements suited to climates with heavy...
SaunaLife SOAK Series
SaunaLife's line of cold plunge tubs designed to pair with their sauna offerings for traditional contrast...
SaunaLife XPERIENCE Series
A premium SaunaLife outdoor sauna line with panoramic glass fronts and design-led architectural details.
Saunum
An Estonian sauna brand known for its proprietary air-mixing technology that distributes löyly heat more...
Scandia
A North American sauna heater manufacturer producing electric heaters for residential, commercial, and...
Smoke Sauna
A traditional sauna heated by a chimneyless wood-fired stove, where smoke fills the room during heat-up and...
Soft Heat
A subjective term for sauna heat that feels gentler and more enveloping, typically associated with high-mass...
Steam Room
A wet-heat enclosure that operates at lower temperatures (around 110 to 120 degrees Fahrenheit) with...
Stone Capacity
The total weight of sauna stones a heater can hold, a key factor in heat retention and löyly quality.
Stone Replacement
The periodic process of replacing sauna stones that have broken down or accumulated debris.
Subfloor Drainage
The combined design of floor slope, drain, and waterproof membrane that handles water in a sauna.
Sweat Lodge
A traditional heat-based ceremonial structure used by Indigenous peoples of North America, predating European...
Temperature Gradient
The difference in temperature between the floor and ceiling of a sauna, typically 30 to 80 degrees Fahrenheit.
Thermal Mass
The capacity of sauna stones and heater materials to absorb and store heat, which determines how much löyly...
Thermal Shock
The mechanical stress on stones or heater components caused by rapid temperature changes when cold water hits...
Thermo Wood
Wood that has been thermally modified at high temperatures to improve dimensional stability and moisture...
Three-Phase Power
An electrical supply configuration commonly used for larger commercial sauna heaters above 12 kW.
Time-of-Use Rates
Electricity pricing that varies by time of day, with peak hours costing more than off-peak hours.
Tongue and Groove
A wood paneling joint where each board has a protrusion (tongue) on one edge and a slot (groove) on the...
Two-Tier Bench
A sauna bench arrangement with two horizontal seating levels, the standard configuration for most residential...
Vapor Barrier
A foil or plastic membrane installed behind sauna interior paneling to prevent moisture from migrating into...
Ventilation
The system of air intake and exhaust that maintains oxygen levels, manages humidity, and supports proper...
Vihta
A bundle of fresh birch branches used in traditional Finnish saunas to gently whip the skin, also called a...
Wall-Mounted Heater
An electric sauna heater designed to attach to the sauna wall rather than stand on the floor, common in...
Water-Reservoir Tank
An accessory water tank that attaches to a wood-burning sauna stove, heating water for washing or rinse-off...
Whisking
The practice of gently striking the skin with a leafy bundle, such as a vihta or venik, during a sauna...
Wood Stove Air Inlet
The opening on a wood-burning sauna stove that allows combustion air to enter the firebox, often adjustable...
Wood-Burning Sauna Stove
A sauna heater fueled by firewood, traditionally the original heat source for Finnish saunas and still...
Every entry in this glossary is written to be technically accurate and practically useful. Where claims relate to health outcomes, energy costs, or safety standards, sources are cited inline. Product entries describe series-level specifications. For current model availability, pricing, and exact specifications, refer to the corresponding product pages on SaunaHeaters.com. Have a term we missed? Email us and we will consider adding it.
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