Infrared and hybrid sauna care: emitters, timber, heater and controls

The short answer

• Emitters: clean only when switched off and cool, with a damp (not wet) cloth. Never spray, pour or splash water on them, and never cover them. Harvia describes its full-spectrum radiators as maintenance-free.
• Timber: the same care as any sauna. Bench towels, mild sauna-suitable cleaners, no bleach or harsh chemicals, and a dry room after use.
• Controls and sensors: don’t move, cover or bypass them, and don’t defeat the time limit.
• Hybrid rooms: everything a traditional sauna needs (stones, heater, drying), plus emitters that must stay dry and out of the löyly.
• Check regularly for cracked emitter glass, loose grilles or backrests, darkened timber near an emitter, and any electrical fault. Those are jobs for a qualified person.

The manual for each emitter, heater and control in your room governs. The examples below come mainly from Harvia’s documentation. Other makers set their own rules.

If you are still deciding between room types, our guide to traditional, infrared and hybrid saunas explains how each works. For the general sauna routine, see caring for your sauna.

What makes an infrared room different to look after

A traditional sauna is cared for around heat, stones and water. An infrared room has no stones and no löyly, but it has several electrical emitters set into the walls, backrests or bench fronts, often behind glass or a timber grille. That changes the priorities.

Why it matters: emitters are electrical devices with hot glass faces. Harvia’s radiators are protected against splashing, but its manuals warn that direct contact with water can still damage them, and they warn that covering a radiator is a fire hazard.

Cleaning the emitters

Harvia’s full-spectrum radiator manuals (VitaMy and FIR) give the same three-step routine:

1. Switch the radiator off.
2. Let it cool down. Harvia warns that the glass becomes very hot in use.
3. Wipe the cooled glass with a damp cloth.

The same manuals add:

• Never immerse the radiator in water.
• Don’t pour water over it.
• Don’t get it too wet when cleaning.
• Children under 14 may clean the device only if they are supervised.

What this means in practice (general good practice, consistent with the manuals):

• Use a soft cloth wrung out well. No sprays aimed at the emitter, no hose and no bucket.
• Don’t use abrasive pads or scourers on the glass.
• Keep timber cleaners and bench oils off the emitter glass and its frame.
• Dust the grille or cover, and the timber around it, as part of the room clean.

Other emitter types, such as carbon panels and heating plates behind the lining, may give different instructions or none for the owner. Follow the manual for the model in your room. If you don’t have it, ask the installer.

Keep the emitters clear and uncovered

Harvia’s radiator manuals say:

• The rear of the radiator and the ventilation slots at the top and bottom must not be covered, so the heat can escape.
• Nothing flammable may hang on or in front of a radiator before the control is switched on.
• Covering a radiator is a fire hazard (Vitae manual), and its heating-plate instructions say the same of covering the plates.

So towels, clothing and robes go on hooks away from the emitters, never draped over a backrest grille. Check the room before switching on, including before any timed or remote start.

Contact protection, grilles and backrests

Full-spectrum radiator glass runs very hot. Harvia’s manuals call for contact protection, such as a timber backrest or grille, depending on where the radiator is mounted, and its Vitae manual specifies a wooden protective grate.

That protection is part of the installation, not a removable accessory:

• Keep it in place. If a grille or backrest needs to come off for any reason, have it refitted as the installer intended before the emitters are used again.
• Check it is secure. A loose grille, a cracked slat or a backrest that has shifted can expose hot glass to skin.
• Look for darkening behind it. Some darkening of timber with age is normal in any sauna. Timber that is scorching, charring or darkening fast around an emitter is not, and the emitter should not be used until it has been checked.

Benches, walls and floor

Timber care in an infrared or hybrid room is the same as in a traditional sauna. The full routine is in caring for your sauna; the essentials:

• Sit on towels. Harvia asks for bench towels to keep perspiration off the timber.
• Clean with warm water and a mild, sauna-suitable cleaner, a soft cloth or brush, working along the grain. Harvia specifies slightly alkaline products (pH 8–10) and suggests a thorough clean one to three times a year for a family sauna.
• No bleach, chlorine, harsh household cleaners, pressure washers or abrasive pads.
• No paint, varnish or lacquer inside the room. Harvia says the walls of a family sauna need no treatment.
• Light sanding with fine sandpaper, along the grain, for stubborn marks.
• Clean around the emitters, not over them. Wipe the timber near an emitter with a damp cloth rather than a wet one, and only when the emitter is off and cool.

Bench treatments are optional. If you use one, choose a sauna-specific product and follow its data sheet. Keep it away from the emitters, and let it dry fully before switching them on. For cedar rooms, see caring for western red cedar.

Sweep or vacuum under the benches. Emitters low on the wall or in the bench fronts sit close to the floor, so take care not to knock them with a vacuum head or mop.

Controls, sensors and timers

• Use the control intended for the emitters. Harvia’s Vitae manual says the radiators must always be controlled with the control unit intended for them, and its FIR radiators may be used only with a control that has an automatic heating-time limit. Never bypass the timer.
• Don’t move or cover the temperature sensor. Where panels use a foil or seat sensor, leave it as installed. Harvia’s heating plates, for example, must have their foil sensor connected.
• Switch off after each session and check that the emitters have actually stopped.
• Error codes: look the code up in the control’s manual, then call a technician rather than resetting it repeatedly.

Our controls guide explains sensors, time limits and remote start in more detail.

Glass doors and windows

Infrared rooms often have glass fronts. Clean the glass as you would other glass, when the room is cool, and keep cleaners off the timber. Harvia’s care sheet says glass elements must be checked after installation, including that the fittings are tight enough, and treats this as the owner’s responsibility. Our glass and doors guide has more.

Airing, dust and moisture

An infrared room is drier than a traditional sauna, but it isn’t dry. People sweat, towels hold moisture, and timber takes it up.

• Air the room after each session. Take towels out, wipe the benches and leave the door ajar so moisture can escape.
• Keep the vents open as the room was designed. Don’t block them with stored items.
• Don’t store things in the room. Cleaning products, cushions and spare towels collect dust and moisture and can end up against an emitter.
• Watch for moisture signs: a musty smell, dark marks at the base of the walls or under the benches, or timber that stays damp. They point to a room that isn’t drying out.

Why it matters: timber that dries out between sessions stays sound; timber that stays damp marks, moves and eventually rots.

Hybrid saunas: one routine for two heat sources

A hybrid, as we use the term, is a traditional sauna with a stone heater and löyly, to which infrared emitters have been added. It needs the full traditional routine, plus the emitter care above. The differences come from having water and emitters in the same room.

What changes compared with a traditional-only room

• Water goes on the stones only. Use small ladles, as your heater manual allows; Harvia sets a maximum of 0.2 litres per ladle. Throw it gently so it doesn’t splash towards the emitters. Harvia’s radiators must not have water poured over them and must not be installed in a steam bath.
• No steam features near the emitters. Some heaters have a built-in evaporator for humid sessions. Whether one can share a room with emitters is a design question for the equipment manufacturers. Don’t add humidity in a way the manuals don’t allow.
• Heat sources run as the manuals allow. Harvia controls the heater and panels in its hybrid saunas separately and makes no statement about running both together. Its Vitae radiator manual recommends using the radiators in hybrid rooms at temperatures under 70 °C, and notes that their power is switched off intermittently when the room gets hot. Never assume both can run at full heat together.
• Emitters keep their distance from the heater. Harvia’s Vitae manual says the radiators must not be installed above the heater and sets a lateral clearance of 800 mm from it. If a heater or an emitter is ever moved or replaced, the new layout must meet both manuals.
• Drying covers the whole room. After a traditional session with löyly, dry the room as your heater manual describes. Harvia’s care sheet suggests leaving the heater on for about 10 minutes with the vent open and the door ajar. The emitters don’t replace that drying step.

The hybrid routine

Intervals depend on the equipment, how often the room is used, your water and the room’s condition. These are the intervals manufacturers publish, not a universal schedule. Stone care is covered in detail in our sauna stones guide.

Warning signs

Stop using the room, or the affected heat source, and have it checked if you notice:

• cracked, chipped or broken emitter glass, or a damaged cover. Harvia’s Vitae manual warns that mechanical stress breaks the radiator and that a broken radiator must always be replaced with a new one;
• an emitter that doesn’t heat, heats unevenly, or keeps running after the control is switched off;
• scorching or fast darkening of timber around an emitter or above the heater;
• a burning or electrical smell, visible damage to cables, or a circuit breaker that keeps tripping;
• water that has reached an emitter, for example from a heavy ladle or a leak;
• a loose or missing grille or backrest over hot glass;
• a displaced sensor or a control fault code you can’t clear;
• in the traditional side of a hybrid, crumbled stones, elements showing, or an overheat protector that cuts out. See our troubleshooting guide.

Harvia’s radiator manuals also carry a user safety warning: if skin reddening lasting more than a day, or mottled discolouration, appears after regular infrared use, stop using the radiator and see a doctor. Follow the safety warnings in your own manuals.

When to call for service

Owners can clean the emitters and timber, keep the stones in order and keep the room dry. Everything electrical, and any damaged emitter, is for a qualified person. BSC Wellness works with a dedicated electrical contractor, an independent business and a Harvia-authorised service agent, who carries out our electrical servicing.