Our two-person pick for an ordinary outlet
Health Mate Enrich 2
Two-person mahogany cabin that plugs into a 15 A outlet, near-infrared panel included
$5,300
Compare with this one →Our one-person cabin pick
SunlightenSignature I
One-person far-infrared cabin that needs its own 120 V, 20 A circuit
Source-based analysis, not hands-on testing. Our method
Cofounder of Superhuman Chambers · About the author. General information, not medical advice. No independent clinical review is claimed.
The verdict
Signature I is a one-person eucalyptus cabin with eight far-infrared heaters, on sale for $4,999. It's 37.8 in wide and runs on 120 V, but it needs its own 20 A circuit. The catch: you can't return it once opened, and the warranty doesn't cover labor.
The trade-off
You can't return it once the boxes are opened, and the warranty doesn't pay for labor.
Model reviewed: 1-person installed far-infrared cabin, eucalyptus
$4,999
Check price at Sunlighten US price, checked
No affiliate commission on this link. Check the exact variant before buying.
About this price
Sale price on Sunlighten's online store on Oct 13, 2026, against a regular price of $5,499. The product page showed $4,799 for a "Fall Reset Event" ending October 14, 2026, with the discount applied at checkout. That extra $200 isn't counted here. A comparison table on the same page listed the Signature line at $5,099, which matches neither price. The 1-person eucalyptus cabin was listed as available, and the page said "Ready to Ship" and "Arrives in 12-14 days". Freight to the contiguous US was free, and the page values it at $648. The price is before tax. Affirm, Klarna and Truemed (HSA/FSA) are ways to pay, not discounts.
A GOOD FIT FOR
One person with a dedicated 120 V, 20 A circuit and about 38 × 40 in of indoor floor.
- One person who wants a cabin on 120 V household power, not 240 V
- You have a dedicated 120 V, 20 A circuit with a NEMA 5-20R outlet where it will go, or can add one
- About 38 × 40 in of indoor floor with 4 in to the walls, under a standard 8 ft ceiling
- You want a listed price and delivery in about two weeks, not a sales quote
THINK TWICE IF
- Two people who want to share sessions, since the bench is 32.1 in wide and seats one
- You want near-infrared or full-spectrum heat, since only far-infrared heaters are listed
- A home where you can't add a dedicated 20 A circuit
- An address without a flat, paved path for the freight pallet, since the carrier won't carry it up steps
- You might want to return it after opening the boxes
- A spot within 5 ft of a shower, tub or cold plunge, which voids the warranty
- You have a pacemaker, implanted medical device or metal prosthesis, which Sunlighten says rules it out
What still needs checking
- Whether an ETL listing covers Signature I, and its file number
- What the linked EMF test measured, on which models and at what distance
- Whether you need GFCI protection or a licensed electrician for the circuit
- What the owner's manual, spec sheet and power box installation guide require, since those PDFs couldn't be opened
- Average power draw once the cabin is up to temperature
- Carton weights, since two to three boxes of 130 lb each don't add up to 428 lb
- How many cleanings one $39 cleaning kit covers
- Whether the $4,999 sale price lasts past the October 14 event
The practical details.
| Exact variant | 1-person installed far-infrared cabin, eucalyptus |
|---|---|
| Heaters | 8 far-infrared heaters, with Sunlighten's SoloCarbon heater named as a feature. No near-infrared or full-spectrum heaters are listed, and per-heater wattage isn't stated |
| Electrical | 120 V, 1,350 W, 20 A. Dedicated 120 V, 20 A circuit with a NEMA 5-20R outlet (5-20P plug) |
| Inside and seating | 32.2 W × 33.6 D × 70.3 H in. One bench, 32.1 W × 20.2 D in and 19.5 in high, for one person |
| Outside and weight | 37.8 W × 39.8 D × 77.7 H in with feet, 428 lb. Leave 4 in to the walls and 12 in above |
| Heat | Up to 170°F. Sunlighten suggests preheating for 45 to 60 minutes and says it warms about 1°F per minute |
| Delivery and assembly | Freight to a garage or flat, paved driveway, left on a pallet. Two people assemble it in about 2 to 3 hours |
| Running cost | Sunlighten estimates 15 to 35 cents an hour |
| Extras | Bluetooth sound system, chromotherapy lights, CELLIANT heater cover and a Reservation Mode that starts the preheat |
| Dimensions | Outside: 37.8 W × 39.8 D × 77.7 H in, including 2 in feet. Inside: 32.2 W × 33.6 D × 70.3 H in. The door opening is 28 in, and the door swings outward to the right. The bench is 32.1 in wide and 20.2 in deep, 19.5 in off the floor. It weighs 428 lb. Sunlighten recommends 4 in of clearance from the walls and 12 in above the cabin. It says the cabin fits under a standard 8 ft ceiling and its panels fit through a standard 30 in doorway. |
| Materials | Eucalyptus, which Sunlighten says is sustainably sourced, with natural variation in tone and grain. Basswood was marked not available, and the Obsidian finish is sold on a separate page. It comes with a CELLIANT heater cover. Sunlighten says the glue is non-toxic, citing third-party testing by Franklin International. |
Before you buy
InstallationIt needs a dedicated 120 V, 20 A circuit and outlet
It needs a dedicated 120 V, 20 A circuit and outlet. The outlet is a NEMA 5-20R, and the plug is a NEMA 5-20P. Sunlighten's FAQ says a power strip or converter voids the warranty. The warranty page also rules out extension cords and non-dedicated circuits. The same page requires at least 5 ft between the sauna and a cold plunge, shower or bathtub. The product page doesn't say whether you need an electrician or GFCI protection. It points you to the spec sheet for electrical details. Sunlighten's support page links an owner's manual, spec sheet, assembly guide and power box installation guide. Those PDFs couldn't be opened for this review. Freight delivery goes to a garage or flat, paved driveway. The carrier leaves the sauna there on a pallet and can't carry it up steps. It comes in two to three mattress-sized boxes of 130 lb each, and you need at least two people to unpack and carry in the panels. The Magne-Seal panels lock together without screws or nails. Sunlighten says two people take about 2 to 3 hours.
WarrantySunlighten's warranty page covers its mPulse, Signature and Amplify cabins under one set…
Sunlighten's warranty page covers its mPulse, Signature and Amplify cabins under one set of terms. For home use, the cabinet and heaters get 7 years. The cabinet includes the bench, floor grates and heater cover frames. The controls (in-sauna tablet, control pad and power box) get 3 years. The glass door and audio get 1 year, and chromotherapy has a separate 1-year warranty. Commercial use gets 5 years on the cabinet and heaters and 1 year on everything else. It covers replacement parts only, not labor or technician costs. You pay the freight on parts shipped for service. It covers only the original buyer and ends if you sell the sauna. It's void on a power strip, extension cord, converter or non-dedicated circuit. It's also void within 5 ft of a shower, tub or cold plunge. Sunlighten's contraindications page adds that repairs attempted without consulting Sunlighten void it. Sunlighten says its saunas aren't designed for outdoor use. Outside, the separately sold sauna cover has to stay on at all times, even during sessions. The sauna must also be bought and put into use within a year of its manufacture date. The page shows no version or effective date.
ReturnsYou can return or exchange it within 30 days of delivery…
You can return or exchange it within 30 days of delivery, but only in the original, unopened packaging. Opened saunas can't be returned. Charges can include a 3% administrative fee, a $499 restocking fee for Signature saunas, storage fees and return shipping. You can cancel before it ships, but the same fees can apply. You start a return by emailing your sales rep or customer care for an authorization, and Sunlighten schedules the pickup. It refunds to your original payment method after it inspects and restocks the sauna. Sunlighten reserves the right to refuse a return, exchange or cancellation.
More about this assessment
Sunlighten Signature I is a one-person far-infrared sauna in eucalyptus, with eight heaters that Sunlighten says reach 170°F. It's rated at 1,350 W and runs on 120 V household power. It needs its own 20 A circuit with a NEMA 5-20R outlet. The sale price was $4,999 (regular $5,499), and Sunlighten estimates running costs at 15 to 35 cents an hour. The cabinet and heaters get 7 years of home-use warranty, but labor isn't covered. Opened saunas can't be returned.
Strengths on paper
- A 37.8 × 39.8 in footprint that fits under an 8 ft ceiling, with panels that fit through a 30 in doorway
- Runs on 120 V household power, rated at 1,350 W
- Sunlighten publishes a 170°F top temperature and a running cost of 15 to 35 cents an hour
- Price and stock are on the page, with free freight in the contiguous US and arrival in 12 to 14 days
- Magne-Seal panels lock together without screws or nails, in about 2 to 3 hours with two people
- Inside, bench, door and clearance figures are all published
- Sunlighten links third-party EMF and air-quality reports, plus a heater-materials statement, from its safety page
Limitations
- Needs its own 120 V, 20 A circuit, and Sunlighten doesn't price the electrical work
- Opened saunas can't be returned
- Unopened returns can cost a $499 restocking fee, a 3% administrative fee, storage fees and return shipping
- Freight stops at the garage or driveway, so you carry the panels in yourself
- The warranty excludes labor, and you pay freight on replacement parts
- Only the cabinet and heaters get 7 years: controls get 3, and the glass door and audio 1
- The warranty ends if you sell the sauna
- Only far-infrared heaters are listed, with no per-heater wattage
- ETL certification is claimed, but no listing number is given
What it costs to own.
Adjust the assumptions for your use. Missing costs stay unknown.
PLAN YOUR OWNERSHIP COSTS
What will it cost to own?
Change the assumptions to fit your use. Leave an unknown cost blank. Add water, subscriptions, cleaning, shipping and taxes if they apply. Use average operating power, not the maximum rating.
3-year known subtotal
$5,371.52Incomplete: installation. This is not the full ownership cost.
Energy component: $372.52
Purchase + installation + years × (annual consumables + annual other) + watts/1000 × hours/day × 365 × years × $/kWh. Annualized allowances, not an exact replacement schedule. Excludes taxes, shipping, finance and resale unless entered.Replacement parts & cost assumptions
Recorded recurring parts and refills:
- Natural Cleaning Kit (optional): $39. Sunlighten's FAQ suggests cleaning the wood and glass every six months with its cleaning kit. It doesn't say how many cleanings one kit covers, so the kit isn't counted in the yearly total.
- Purchase is the $4,999 sale price on Sunlighten's online store on Oct 13, 2026. At the $5,499 regular price, it would be $500 more. Freight to the contiguous US was advertised as free.
- Installation cost is unknown. You assemble it yourself, two people for about 2 to 3 hours. If there's no dedicated 120 V, 20 A circuit with a NEMA 5-20R outlet where it will go, you'll need one added. Sunlighten doesn't price that work.
- No filter, lamp or other required replacement part is listed, so annual consumables are $0. Repairs and warranty labor are on you.
- Sunlighten suggests cleaning the wood and glass every six months with its $39 Natural Cleaning Kit. If you bought a new kit for each cleaning, that would add $78 a year.
- Energy assumes 1.4 hours a day at the 1,350 W rating. That's Sunlighten's suggested 40-minute daily session plus a 45-minute preheat. The rating isn't a measured average, so treat this as an upper estimate. It comes to about 690 kWh a year, or about $124 at $0.18 per kWh.
- Sunlighten's own estimate of 15 to 35 cents an hour comes to about $77 to $179 a year at that use.
- No subscription or app fee is mentioned, so other yearly costs are $0.
Evidence & sources.
Are saunas good for you? Our evidence review grades the research as Moderate. That grade is about the claim, not about this product.
- Manufacturer claimHeater count, electrical rating, measurements, weight, top temperature, delivery and assembly details come from Sunlighten's product page.16 These are Sunlighten's figures, and none of them was independently measured. The product and support pages link a Signature I spec sheet, owner's manuals, an assembly guide and a power box installation guide. Those PDFs couldn't be opened on Oct 13, 2026, so their electrical and installation details weren't checked.
- Manufacturer claimSunlighten says its heater panels measure 0.5 mG, less than 1 mG, and links an EMF test report by Vitatech Electromagnetics.14 The safety page gives only the 0.5 mG figure, with no measuring distance, test date or model list. The linked PDF couldn't be opened on Oct 13, 2026, so it's unclear whether Signature I was tested.
- Manufacturer claimSunlighten says its saunas are ETL-certified and points to the Intertek Directory to check.14 Neither page gives a listing number or says which models are covered, and UL isn't mentioned. The Intertek Directory couldn't be searched for this review, so no listing was confirmed. Ask Sunlighten for the file number before you buy.
- Manufacturer claimSunlighten links an indoor air-quality report by APEX Environmental Consultants. It says the report found only trace levels of VOCs.4 That summary is Sunlighten's, and the page says only that a sampling of its saunas was tested. The APEX PDF couldn't be opened on Oct 13, 2026, so the models, dates and figures weren't checked.
- Manufacturer claimSunlighten calls its products general wellness products, not medical devices, and says to check with your health professional before use.467 That's a precaution, not evidence of a benefit.
- Manufacturer claimSunlighten's contraindications page warns that the magnets used to assemble its saunas can interrupt the pacing and inhibit the output of pacemakers.17 The page doesn't name models, but it says magnets are used to assemble Sunlighten's saunas. Signature I's panels use Magne-Seal locking. It says not to use the sauna if you have a pacemaker, implanted medical device or metal prosthesis. It also says to see a physician first if you're pregnant or have obesity, heart disease, high or low blood pressure, circulation problems or diabetes. For children and older adults, it advises a lower temperature and no more than 15 minutes at a time.
- Manufacturer claimSunlighten suggests beginners start with 10 to 15 minute sessions at 100°F every other day. It suggests building toward 40-minute daily sessions.1 That's a usage suggestion, not evidence of a benefit. It's also the basis for the daily use in the energy estimate.
Sources (8)
- Signature I - Eucalyptus Sunlighten · manufacturer · checked Oct 13, 2026
- Signature I - Eucalyptus store listing (variant price and availability) Sunlighten · manufacturer · data file · checked Oct 13, 2026
- Sunlighten warranty (US and Canada) Sunlighten · manufacturer · checked Oct 13, 2026
- Sunlighten sauna safety (EMF, ETL, materials and air quality) Sunlighten · manufacturer · checked Oct 13, 2026
- Sunlighten returns and cancellation policy Sunlighten · manufacturer · checked Oct 13, 2026
- Signature I support (manuals, spec sheet, assembly and power box guide links) Sunlighten · manufacturer · checked Oct 13, 2026
- Contraindications Sunlighten · manufacturer · checked Oct 13, 2026
- Sunlighten store search for cleaning kit (product prices) Sunlighten · manufacturer · data file · checked Oct 13, 2026
Other options.
Back to our saunas picks →
Sunlighten
Sunlighten Amplify II
Two-person cabin with eight heaters on a dedicated 120 V circuit
$5,999
Compare with this one →
Sun Home
Sun Home Equinox 2-Person
Two-person full-spectrum cabin on a dedicated 120 V circuit
$6,099
Compare with this one →About this review. The facts on this page come from manufacturer pages, checked Oct 13, 2026. The sources are listed above.
Our editorial policy →