- Contactor
- The heavy-duty switch inside a control unit or relay box that carries full current to the heating elements. Its amp rating is what caps the maximum heater size a controller can run.
- Relay / contactor box
- A separate enclosure holding the contactor and low-voltage transformer, mounted outside the hot room. Homecraft ships one paired with its touchpads.
- NTC sensor
- A thermistor mounted on the ceiling whose electrical resistance changes with heat. The control panel reads that resistance and converts it to a temperature, which is why sensors and panels must be the same brand.
- Overheat protector
- An independent safety cut-out that kills power if the sauna exceeds a safe temperature. Usually reset by hand with a small button once the unit has cooled.
- High limit
- Another name for the overheat cut-out circuit. On larger heaters it is often wired on its own conductor run back to the contactor box.
- Built-in controls
- A heater with the thermostat, timer and contactor already integrated on the unit, so no separate wall control is required.
- External controls
- A heater that is elements and a terminal block only. Switching and temperature sensing live outside in a separate control unit, which is therefore mandatory.
- kW (kilowatt)
- The heater output. Sizing is driven by the heated room volume, its insulation and any uninsulated surfaces such as glass or stone.
- Single-phase / 3-phase
- The supply configuration. 240V single-phase is typical residential; 208V 3-phase is common in commercial buildings and needs a different heater SKU and contactor box.
- Dedicated circuit
- A breaker and conductor run feeding the heater alone, with nothing else on it. Every electric sauna heater requires one, installed by a licensed electrician.
- GFCI
- Ground-fault protection. Requirements vary by jurisdiction and by whether the heater is indoors or outdoors, so follow local code and the manual.
- Clearance to combustibles
- The minimum distance that must be kept between the heater and any burnable surface such as timber walls, benches or the ceiling. Non-negotiable and listed per model.
- Stone capacity
- How much rock the heater holds, in kilograms or pounds. Stones store and release heat and produce steam when water is thrown.
- Loyly
- The burst of steam and soft heat produced when water is thrown onto hot stones. Finnish term, and the reason stone mass matters.
- Vapour barrier
- Foil sheeting behind the interior cladding that stops moisture reaching the insulation and structure. Seams are taped; gaps cause rot.
- Ventilation inlet / outlet
- Paired vents that move air through the room. The inlet usually sits low near the heater, the outlet high on the opposite side.
- Duckboard
- A removable slatted floor section that keeps feet off the hot or wet floor and allows drainage.
- Element
- The resistive heating rod inside an electric heater. Elements are consumable and are the part most warranties cover specifically.
- Flue / chimney
- The exhaust path on a wood-burning stove. Diameter, height and insulated pass-throughs are specified per model and are a fire-safety matter.
- Damper
- A plate in the flue that regulates draught and therefore burn rate on a wood stove.
- Heat shield
- A panel that lets a stove or heater sit closer to a wall by reflecting and venting radiated heat. Reduces the required clearance.
- Standby / pre-set
- Scheduling a heat-up so the room is ready at a chosen time. Many jurisdictions require a door-safety or occupancy check before remote starting.
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