Finnleo S-870 Infrared Sauna
Finnleo S-870 Infrared Sauna
Overview
The Finnleo S-870 is a space-efficient corner infrared sauna for two to three people. Its distinctive glass-face design requires just over a 4-by-4-foot floor area, making it well suited to indoor corner installations.
Features
- Bluetooth sound system with heat-resistant speakers
- LED lighting with six color options
- Full-sized calf emitters
- Wall-to-wall CarbonFlex Low EMR/Low EF heat coverage
- Innovative glass face
- Canadian Hemlock construction inside and out
- InfraLogic2 (IL2) control with Wi-Fi and mobile app
- Combination door handle that doubles as a towel bar
- In-bench far-infrared emitter
- Matte black metallic CarbonFlex floor emitter
Technical Specifications
- Seating Capacity: Up to 3
- Exterior Dimensions: 51-7/8" W x 51-7/8" D x 76-1/2" H
- Approximate Unit Weight: ~405 lbs.
- Electrical: 120 V, 15 A standard outlet, single phase
- Power: 1,710 W
- Heater: CarbonFlex IR
- Control: IL2 with Wi-Fi and mobile app
- Cord Length: 6 ft
- Lighting: Under-bench and valance LED lighting
Construction & Installation
- Use: Indoor only
- Exterior Wood: Canadian Hemlock
- Interior Wood: Canadian Hemlock
- Assembly: Pin-and-Hook wall locking system
- Door: Clear all-glass door, 21-5/8" W x 70" H
- Required Clearances: 3 inches at the sides and 5 inches overhead
Shipping, Safety & Warranty
- Part Number: 9804-4470
- Approximate Palletized Shipping Weight: ~480 lbs.
- Safety: ETL listed
- IR Emitters: 5-year warranty
- Wood Cabinet: 5-year warranty
- Controls: 5-year warranty
Brand
Finnleo
Finnleo S-Series FAQs
What is the Finnleo S-Series?
The Finnleo S-Series is a collection of freestanding indoor infrared saunas designed for convenient at-home wellness. The lineup includes six models with seating capacities ranging from one to four people.
How is an S-Series infrared sauna different from a traditional sauna?
S-Series saunas use infrared emitters to warm the body more directly at a lower air temperature. They do not use a traditional heater, sauna stones or water-over-rock steam.
Which Finnleo S-Series models are available?
The collection includes:
- S-810: One person
- S-820: Up to two people
- S-825: Up to two people with additional interior room
- S-830: Up to three people with room to lie down
- S-840: Up to four people with flexible U-shaped seating
- S-870: Up to three people in a corner-friendly layout
What type of infrared heating does the S-Series use?
S-Series saunas use CarbonFlex emitters and Finnleo’s Pure Infra low-EMR/low-EF technology. Emitters are positioned along the walls, seat, floor and calf areas to provide even, full-body heat coverage.
What electrical connection does an S-Series sauna require?
Every S-Series model operates on 120 volts. Electrical requirements vary between a standard 15-amp outlet and a dedicated 20-amp outlet, depending on the model. Customers should confirm the exact requirement before installation.
Can an S-Series sauna be installed outdoors?
No. Finnleo S-Series saunas are designed for indoor use. Suitable locations may include a home gym, wellness room, finished basement, bathroom suite or other climate-controlled interior space.
Are S-Series saunas difficult to assemble?
S-Series saunas use prefabricated, prewired panels and a Pin-and-Hook wall-locking system to simplify assembly. Customers should still confirm delivery access, door swing, floor requirements and the required side and overhead clearances before installation.
Can an S-Series sauna be controlled with a mobile app?
Yes. S-Series models include Finnleo’s InfraLogic2 control with Wi-Fi and mobile app connectivity. Users can control functions such as power, session time, temperature, lighting and compatible audio features.
Do S-Series saunas include lighting and Bluetooth audio?
Yes. Standard comfort features include RGBW color LED lighting and an integrated Bluetooth sound system. Customers can personalize the lighting and listen to music, podcasts or other audio during a session.
What warranty comes with a Finnleo S-Series sauna?
Current manufacturer specifications list five-year warranty coverage for the infrared emitters, wood cabinet and controls. Customers should review Finnleo’s complete warranty terms for coverage requirements, limitations and registration information.
Sauna Safety Tips
Saunas can be a relaxing and beneficial part of a wellness routine, but it is important to use them safely. Start with shorter sessions, especially if you are new to sauna use, and limit most sessions to about 15–20 minutes. Drink plenty of water before and after using the sauna, and avoid alcohol before, during, or immediately after your session, since heat and sweating can increase the risk of dehydration or dizziness. Always cool down gradually after exiting the sauna, and leave right away if you feel lightheaded, nauseous, weak, or uncomfortable. People who are pregnant, have heart conditions, low or high blood pressure, or other medical concerns should speak with a healthcare provider before using a sauna.
Sauna Blog Posts
Best Sauna for Idaho Homes: Indoor vs. Outdoor Buyer's Guide
A sauna is one of the most rewarding wellness additions you can make to an Idaho home — and after a day on the slopes or a cold morning, that deep heat feels even better. But first you face a fundamental choice: indoor or outdoor? That single decision shapes everything — placement, install cost, how it handles Idaho's freeze-thaw winters, and the whole ritual of using it. This buyer's guide compares indoor and outdoor saunas head to head, breaks down traditional vs. infrared (and the Finnleo InfraSauna hybrid), covers heaters and sizing, and explains why Finnleo and Tylö's Finnish-Swedish heritage — including Tylö's world-class heaters — makes them built to last through every Idaho winter.
Can You Lose Weight by Using a Sauna?
Two landmark Finnish studies — following over 16,000 participants for up to 39 years — found that regular sauna use is associated with dramatically lower risk of dementia and Alzheimer's disease. This guide breaks down what the research actually says, explains the six biological mechanisms that make sauna bathing protective for the brain, and shows you how to incorporate sauna use into a brain-healthy lifestyle.
Infrared Vs Traditional Saunas: What's the Difference?
They both make you sweat — but the way they deliver heat is fundamentally different. Traditional saunas heat the air to 170–195°F and have 20+ years of research linking regular use to lower cardiovascular mortality and dementia risk. Infrared saunas heat your body directly at 120–150°F and have the strongest evidence for chronic pain relief and accessibility. This guide compares both types side by side — how they work, how they feel, health benefits, installation, costs, and a decision framework to help you choose.
