S-Series S-840 Infrared Sauna (4-Person U-Shaped Seating Portable Infrared Sauna)

Picture yourself ending the day with your household in one place for a few quiet minutes, or taking a solo reset in a room that actually feels spacious. The S-Series S-840 Infrared Sauna is built for families, couples who want room to stretch out, and anyone who wants a true “at-home retreat” feel without turning the space into a full renovation. This is a 4-person U-shaped seating portable infrared sauna that can flex with the way you live.

If you’re unsure whether a larger infrared sauna will feel like a real, even session for everyone inside, that’s a fair concern. The S-Series S-840 Infrared Sauna is designed with wall-to-wall heat coverage, so you avoid the hot-and-cold spot problem that makes group sessions feel uneven. In everyday use, that means each seat feels intentional, and you spend less time shifting around to “find the warm spot.”

Another common hesitation is layout: “Will it truly seat four, or is that optimistic?” This model’s seating is designed around U-shaped seating, using a bench insert that converts the two long benches into a U. That gives you the flexibility to seat up to four people, or set the space up so two people can lie down at once, which is a practical luxury you’ll notice immediately.

Controls and everyday usability matter even more with a family-size sauna. The proprietary InfraLogic2 (IL2) control system with Wi-Fi is built to set and schedule sessions, and it can extend control to your phone using the mobile app. The benefit is simple: your routine stays easy, whether you’re fitting it in after workouts, after work, or before bed.

On materials and build quality, the cabin is Canadian Hemlock inside and out, responsibly harvested and sealed with a bio-friendly furniture-grade finish. It also uses a “Pin-and-Hook” wall locking system for a stable enclosure feel. The unit is ETL listed for safety, which is a practical trust signal for a larger in-home installation.

Comfort is where the S-840 stands out in daily use. You get full-sized calf emitters for better lower-body warmth, plus an in-bench far-infrared emitter and a matte black metallic floor emitter for head-to-toe comfort. Add elegant LED lighting with 6 color options and under-bench/valance lighting, and it creates a calmer atmosphere that feels like a dedicated retreat, not a bright utility box. For entertainment, the integrated Bluetooth sound system pairs with your device through heat-resistant speakers.

For practical ownership planning: this 4-person U-shaped seating portable infrared sauna is inside only and requires a 20-amp 120V dedicated outlet (listed at 2200 watts, 20 amps, 120V) with a 6’ cord. Plan for space and safe handling, since the sauna weighs about 600 lbs. (shipping weight palletized about 675 lbs.). If you are not fully certain the outlet is dedicated or the circuit is appropriate, a licensed electrician should confirm the setup before installation day.

Important planning note: Installation requires 3″ side and 5″ overhead clearance, and the drawing notes minimum clearance needed for assembly is 83 1/2″. The manufacturer also notes measurements may change over time, so confirm final fit if you are working with tight ceiling height or narrow access paths.

Product Highlights

• S-Series S-840 Infrared Sauna with 4-person U-shaped seating flexibility

• Converts seating using a bench insert to seat up to 4 or allow two to lie down

• Dimensions: 71 3/8″ W x 56 5/8″ D x 76 1/2″ H

• Inside only placement

• Electrical: 20-amp 120V dedicated outlet (2200W / 20A / 120V)

• Wall-to-wall heat coverage for even comfort across multiple seats

• Full-sized calf emitters, plus in-bench and floor emitters for head-to-toe comfort

• All-glass front wall (clear) for a more open, non-claustrophobic feel

• IL2 control with Wi-Fi + mobile app capability

• LED lighting with 6 color options + under-bench/valance lighting

• Integrated Bluetooth sound system with heat-resistant speakers

• Warranty: 5 years on IR emitters, wood cabinet, and controls

Visit our Hollywood showroom and get that “this is the one” feeling—real craftsmanship, real finishes, and real perspective.

If you want a 4-person U-shaped seating portable infrared sauna that feels spacious, flexible, and realistic for daily life, the S-Series S-840 Infrared Sauna is built to be the “everyone fits” option without losing the premium feel. Bring your room dimensions and a photo of your outlet location, and we will help you confirm clearance, dedicated circuit needs, and the best placement.

Call Sauna & Steam Center at 954-744-5395 for availability, options, and a fast ‘will this work in my home?’ check. Or visit our Hollywood showroom to see materials and sizing in person and buy with confidence.