All saunas aim to raise your core body temperature—but how they do it makes all the difference.

Far-infrared (FIR) saunas use longer wavelengths (typically 3000+ nm) that are absorbed mostly by water, which means they primarily heat the surface of your skin. This can make sessions slower and less efficient, often requiring long preheat times—sometimes 40 minutes or more. FIR light also doesn’t activate photobiomodulation, because our bodies don’t have light-sensitive receptors (chromophores) for those wavelengths.

To compensate, some FIR saunas add red or near-infrared LED panels. But LEDs are flickery, narrow-spectrum, and lack the therapeutic heat and broad-spectrum harmony of incandescent light.

Our FireLight® Sauna uses primarily near infrared (NIR) incandescent light (700–1500 nm), which penetrates deeper into tissue, raises your core temperature faster, and delivers full-spectrum radiant heat—just like sunlight, but without the UV. This supports real photobiomodulation, full-body detox, and deep cellular rejuvenation.

In short:

• FIR: Slower, surface-level heating. No photobiomodulation.
  
• FireLight®: Deep heat, fast sessions, real light therapy.
  

Built to mimic nature. Backed by biology. Designed to transform.

Because it’s smarter, safer, and more beautiful in every way.

Our natural canvas enclosure makes the FireLight® Sauna portable, breathable, and tool-free to set up—ideal for apartments, guest rooms, or anywhere life flows. Unlike heavy wooden boxes, it’s easy to move, won’t off-gas toxins, and won’t trap moisture over time. In fact, most wooden saunas are prone to mold. Ours isn’t. The fabric is washable, air-permeable, and naturally resistant to buildup.

But don’t mistake lightness for fragility. The canvas is double-layered, tightly woven, and incredibly durable—providing excellent insulation that rivals traditional wood saunas. It holds heat beautifully while staying gentle on the senses.

Aesthetically, it’s a return to something ancient and essential: simple materials, honest construction, and a sanctuary that honors your nervous system. Add the SilverLining™ upgrade, and you’ve got a Faraday-shielded space free from EMFs, static, and interference.

Minimal footprint. Maximum healing. This is the future of sauna design—rooted in tradition, refined for modern life.

Yes—intensely and efficiently. You’ll start sweating within just a few minutes, and you’ll keep sweating for the duration of your session.

The FireLight® Sauna uses radiant near infrared heat (thermal near infrared 980 - 1500 nm) that penetrates deep into your tissues, raising your core body temperature from the inside out. Unlike traditional or far-infrared saunas, which heat the air around you, FireLight® heats you directly—so you’re not sitting in a box of stifling air, gasping for breath. It feels more like basking in the sun than sitting in a steam room.

In the Classic Sauna (4 bulbs), most people complete a full session in about 20–30 minutes. In the SuperSauna (7 bulbs), it’s closer to 15–20. No preheating needed. Just step in, switch on, and your body gets to work.

The result? A steady, sustained sweat that feels clean, grounded, and deeply invigorating—without the lung-scorching heat.

All FireLight® Saunas are plug-and-play—no electrician needed. We offer 120 V and 240 V versions, depending on where in the world you’ll be using your sauna.

For 120 V Countries (e.g. USA, Canada):
Choose the USA Plug. Your Hearth ships with 120 V FireLight® Bulbs and a standard plug adapter. Both the Classic and SuperSauna models work with a standard wall outlet, using a standard 15 A, 120 V circuit.

For 220–240 V Countries (Europe, Asia, Australia, New Zealand, Africa, the Middle East, Brazil, India, and others):
Choose the plug option that matches your country: EURO, UK, SWISS, AU/NZ, BRAZIL, or INDIA. Your Hearth will ship with 240 V FireLight® Bulbs and the correct plug adapter. Both the Classic and SuperSauna models work on a standard 8 A or 10 A, 220-240 V circuit—no rewiring required.

Still not sure? Just check the voltage printed on your wall outlet or reach out to our team. We’ll make sure you get exactly what you need.

Because lying down makes it passive. Sitting upright makes it powerful.

The FireLight® Sauna is designed to engage your whole system—not just warm you up. When you sit upright with good posture and rotate slowly, you get full-body exposure, enhanced lymphatic flow, and deeper light absorption. Your breath opens, your spine aligns, and your detox pathways work more effectively.

Lying down reduces circulation, collapses your posture, and limits your body’s ability to sweat and release. It may feel relaxing, but it misses the point. This is active healing, not nap time.

Think of it less like lounging—and more like aligning. Upright. Present. Fully lit.

Yes—and we’ve designed one that’s pretty much perfect.

The FireLight® Sauna comes with our signature Basswood Sauna Stool, crafted specifically to support your posture and optimize your session. It’s the right height, the right shape, and made from the right material: lightweight, non-toxic, and naturally grounding.

Sitting upright on the stool keeps your spine aligned and your heart open—allowing for better breath, deeper parasympathetic activation, and full-body light exposure as you rotate. The seat is gently curved for comfort and stability, and it stores flat when not in use.

It may seem like a small detail, but once you try it, you'll understand: this stool changes everything.

Yes—and it’s a key part of how SaunaSpace works.

Our saunas are designed for dynamic, full-body exposure. As you gently rotate throughout your session, each side of your body receives direct, radiant light—no need for extra bulbs or longer sessions.

There’s no strict rule. Most people rotate every 3 to 5 minutes, or simply whenever it feels right. Some turn in quarters, others do a slow side-to-side flow. Let your body guide the rhythm.

Beyond even exposure, rotation creates thermal contrast—while one side heats, the other cools slightly. This activates circulation and drives heat deeper into your tissues, amplifying the internal healing response.

In the SuperSauna® (7 bulbs), most people reach a 3°F core temperature increase (plus about a pound of water loss) in just 15 minutes. In the Classic Sauna (4 bulbs), it takes about 20–30 minutes. No preheat, no steam, no gasping—just real, radiant heat that moves with you.

Not much—especially for something that supports your detox, boosts your circulation, calms your nervous system, and leaves you glowing.

The Classic Sauna (4 bulbs, powered by a Hearth™ Quartet) uses 1000W, which comes out to about 16¢ per hour based on average U.S. energy rates.

The SuperSauna (7 bulbs, powered by a Hearth™ Quartet and a Hearth™ Trio) uses 1750W, costing around 29¢ per hour.

That’s less than a load of laundry—and infinitely more restorative.

You can absolutely do it yourself—and most people do.

Every FireLight® Sauna is designed for easy, tool-free assembly. Just unbox, unzip, and follow the simple steps. Setup takes about 20-40 minutes, quicker if you’ve done it before.

No contractors, no confusing instructions, and no need to drill holes in your walls. It’s designed to go up and down as needed, whether you’re moving houses or just rearranging a room. And when not in use, it packs flat for low-profile storage.

You don’t need a spa wing in your home.

The FireLight® Sauna was designed to fit beautifully into real homes. Both the Classic and SuperSauna share the same compact, trapezoidal footprint—52" x 52" at the front, narrowing to 24" at the back. It tucks easily into bedrooms, home offices, guest rooms, or a quiet corner of your studio.

There’s no plumbing, ventilation, or special wiring required—and no lingering steam or humidity. When you’re done, just unzip the door and let the warmth fade. Many people leave the lights on for a few extra minutes to gently dry the stool and mat covers. That’s all it takes.

Clean. Self-contained. Elegantly efficient.

Peaceful. Warm. Surprisingly profound.

The inside of the FireLight® Sauna is a soft cocoon of natural materials: organic canvas, raw basswood, and radiant light. No harsh lights, no beeping electronics, no glass screens or buzzing panels.

It feels like sunlight on your skin—but deeper. The warmth penetrates your muscles and bones without overwhelming your lungs. Most people describe it as grounding, comforting, and a little bit addictive.

Nope. It’s completely silent.

There are no fans, no electronics, and no motors—just pure incandescent light, gently heating your body. If you want to listen to music or meditate while inside, you’ll have a perfectly quiet space to do so.

Zero minutes.

The moment you turn it on, the FireLight® Bulbs begin emitting both heat and light. You can step in immediately—no waiting, no warm-up cycle. Most people start sweating within 5 minutes.

Yes—and many people do.

The sauna is designed to be a permanent part of your space, even if it’s not in a spa room. Its minimalist footprint and organic aesthetic make it easy to integrate into a bedroom or studio.

But if you do need to take it down, it’s easy to disassemble and store flat.

That’s exactly who we designed it for.

Because the FireLight® Sauna heats you directly—not the air—you’re less likely to feel lightheaded or overwhelmed, even if you’re heat-sensitive. And with the SilverLining™ upgrade, you get full EMF shielding, turning your sauna into a grounded Faraday space that’s ideal for people with EHS, mold illness, or nervous system dysregulation.

Yes—and it can actually enhance your results.

Near infrared light supports mitochondrial energy, lymphatic flow, and detoxification pathways, making it an ideal companion to structured wellness protocols. Just make sure to hydrate well, support your electrolytes, and ease into it if your system is already under stress.

As little as possible.

The more skin exposed, the more light and heat your body receives. Most people go nude or wear a light cotton towel. No synthetic fabrics (they can block light or off-gas). Just keep it simple, breathable, and comfortable.

Many people notice the difference after a single session—especially with sleep, mood, or muscle tension.

Others feel the deeper benefits over time: fewer headaches, more stable energy, better recovery, improved resilience. Like anything worth doing, it builds. Light works with your body, not against it.

The FireLight® Bulb is rated for 5,000 hours and typically lasts 5 to 10 years, depending on use. When it eventually burns out, replacing it is simple—it screws in just like a standard bulb, no tools needed.

If it burns out within five years, we’ll replace it for free under our warranty. After that, you’ll still get a special replacement price of $95.

Long-lasting, easy to replace, and always backed by us.