Installed infrared cabin

SunlightenAmplify III

Name: Sunlighten Amplify III
Brand: Sunlighten
Price: 6999.00 USD

Three-person cabin with ten heaters on a dedicated 120 V circuit

By Porsche Ma Facts checked Oct 13, 2026

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

Amplify III is a three-person eucalyptus cabin with seven far-infrared and three full-spectrum heaters, on sale for $6,999. It runs on 120 V but needs its own 20 A circuit. The catch: you can't return it once it's opened, and the product page doesn't give its wattage, so running costs are unknown.

The trade-off

Opened saunas can't be returned, and the product page skips wattage, top temperature and a safety listing number.

Sunlighten Amplify III, manufacturer product image — Photo: Sunlighten.Source ↗

Model reviewed: 3-person installed infrared cabin, eucalyptus/obsidian

$6,999

US price, checked Oct 13, 2026

Check price at Sunlighten

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 $8,099. The product page showed $6,799 for a "Fall Reset Event" ending October 14, 2026, with the discount applied at checkout. That extra $200 isn't counted here. The store listed the 3-person Eucalyptus Black Edition as available. The page said "Ready to Ship" and "Arrives in 12-14 days", with free freight shipping in the contiguous US. The price is before tax. Affirm, Klarna and Truemed (HSA/FSA) are ways to pay, not discounts.

A GOOD FIT FOR

Two or three people who share sessions, with a dedicated 120 V, 20 A circuit and about 63 × 46 in of indoor floor.

Two or three people who want to sit side by side on a 56.7 in bench
A dedicated 120 V, 20 A circuit where the cabin will go, or plans to add one
A room with a standard 8 ft ceiling and about 63 × 46 in of floor, reached through a 30 in doorway
You want a listed price and delivery in about two weeks, not a sales quote

THINK TWICE IF

You'll mostly use it alone, since the 2-person size costs $1,000 less
A home where you can't add a dedicated 20 A circuit
An address without a flat, paved path to the garage door, since the carrier won't carry the pallet 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

What still needs checking

The cabin's rated wattage and amperage, and so its running cost
The maximum cabin temperature
Which outlet type it needs and whether GFCI protection is required
How much clearance to leave around the cabin
Whether the warranty's no-labor line covers cabin saunas or only the red light panel
What the owner's manual and power box installation guide require, since those PDFs couldn't be opened
Whether an ETL listing covers this exact model, and its file number
What the linked EMF test measured, on which models and at what distance
Carton weights, since two to three boxes of 130 lb each don't add up to 642 lb
Whether the $6,999 sale price outlasts the October 14 event

The practical details.

Specifications for Sunlighten Amplify III
Exact variant	3-person installed infrared cabin, eucalyptus/obsidian
Heaters	7 SoloCarbon far-infrared heaters and 3 halogen full-spectrum heaters. Wattage of each isn't stated
Electrical	120 V on a dedicated 20 A circuit and outlet. Wattage, amperage and outlet type aren't on the product page
Inside and seating	56.8 W × 39.9 D × 70.3 H in. One bench, 56.7 W × 20.3 D in and 19.5 in high, for up to three people
Weight	642 lb
Delivery and assembly	Freight to a flat, paved surface at your garage door, left on a pallet. Two people assemble it in about 2 to 3 hours
Heat-up	Sunlighten suggests preheating for 45 to 60 minutes and says it warms about one degree per minute
Options	Eucalyptus or Obsidian at the same price, basswood $200 less. The 2-person size costs $1,000 less. Integrated red light was marked not available
Extras	Bluetooth sound system, chromotherapy lights and a CELLIANT heater cover
Dimensions	Outside: 62.3 W × 45.9 D × 77.7 H in, including 2 in feet. Inside: 56.8 W × 39.9 D × 70.3 H in. The door opening is 28 in. The bench is 56.7 in wide and 20.3 in deep, 19.5 in off the floor. It weighs 642 lb. Sunlighten says it fits under a standard 8 ft ceiling and its panels fit through a standard 30 in doorway. The product page gives no clearance to leave around the cabin.
Materials	It's eucalyptus in Sunlighten's black Obsidian finish. Plain eucalyptus costs the same, and basswood is $200 less. It comes with a CELLIANT heater cover. Sunlighten says its eucalyptus is sustainably sourced. It also says the glue on the tongue-and-groove boards is non-toxic and was third-party tested 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. Sunlighten's FAQ says a power strip or converter voids the warranty. The warranty page also rules out extension cords and shared circuits. It asks for at least 5 ft between the sauna and a cold plunge, shower or bathtub. The product page suggests booking an electrician so the outlet is ready on build day. It doesn't list the wattage, amperage or outlet type. Freight delivery needs a flat, paved surface up to your garage door. 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. The Magne-Seal panels lock together without screws or nails. Sunlighten says two people take about 2 to 3 hours.

WarrantySunlighten's warranty page groups Amplify with its other cabin saunas

Sunlighten's warranty page groups Amplify with its other cabin saunas. For home use, the cabinet and heaters get 7 years, the controls 3 years, and the glass door and audio 1 year. Commercial use gets 5 years on the cabinet and heaters and 1 year on everything else. You pay the freight on parts shipped for service. A general disclaimer says coverage is for replacement parts only, not labor or technician costs. It sits right after the red light panel's terms, so it's unclear whether it applies to cabins. The warranty covers only the original buyer and ends if you sell the sauna. It's void on a power strip, extension cord, converter or shared circuit, or within 5 ft of water. Sunlighten says its saunas aren't designed to be placed outdoors. If you put one outside anyway, its cover (sold separately) 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.

ReturnsNon-custom saunas like Amplify can be returned or exchanged within 30 days of delivery…

Non-custom saunas like Amplify can be returned or exchanged within 30 days of delivery, but only in the original, unopened packaging. Opened saunas can't be returned or exchanged. Charges can include a 3% administrative fee, a $499 restocking fee, storage fees and return shipping to the warehouse. Cancelling before it ships can cost the 3% fee, plus storage fees if the sauna has to be re-routed. Sunlighten reserves the right to refuse a return, exchange or cancellation. It refunds to your original payment method after it inspects and restocks the sauna.

More about this assessment

Sunlighten Amplify III is a three-person infrared sauna in eucalyptus with the black Obsidian finish. It has seven SoloCarbon far-infrared heaters and three halogen full-spectrum heaters. It runs on 120 V but needs a dedicated 20 A circuit and outlet. The sale price was $6,999 (regular $8,099), with free freight to your garage door. The cabinet and heaters get 7 years of home-use warranty, and opened saunas can't be returned. The product page doesn't give its wattage or top temperature, so running costs are unknown.

Strengths on paper

Ten heaters: seven SoloCarbon far-infrared and three halogen full-spectrum
Seats three on 120 V household power, not 240 V
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 and door sizes are all published
Sunlighten says it fits under an 8 ft ceiling and its panels fit through a 30 in door
Sunlighten links third-party EMF and air-quality test reports 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 is left on a pallet at the garage door, and the carrier won't carry it up steps
You pay freight on replacement parts, and labor may not be covered
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
No wattage, top temperature or outlet type on the product page
ETL certification is claimed, but no listing number is given for this model

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.

Purchase price ($)Installation / accessories ($)Annual consumables ($)Average operating power (W)Hours per dayAnnual other costs ($)Electricity ($/kWh)Years

3-year known subtotal

$6,999.00

Incomplete: installation, energy use. This is not the full ownership cost.

Energy component: Unknown

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

No scheduled consumable is listed. That does not mean zero maintenance or repair costs.

Purchase is the $6,999 sale price on Sunlighten's online store on Oct 13, 2026. At the $8,099 regular price, it would be $1,100 more. Freight shipping was advertised as free in the contiguous US.
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 where it will go, you'll need an electrician to add one. Sunlighten doesn't price that work.
No filter, lamp or other recurring part is listed, so annual consumables are $0. Electricity, cleaning and repairs still cost money, and the warranty may not cover labor.
The product page doesn't give the cabin's wattage, so energy cost is unknown. Sunlighten suggests preheating for 45 to 60 minutes, which adds to the running time of every session.
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 needs, measurements, weight, delivery and assembly details come from Sunlighten's product page.^{1, 6} These figures come from the maker and weren't measured independently. Sunlighten's support page lists an Amplify III spec sheet, owner's manuals, a US 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.^{1, 5} The safety page gives no ELF figure, measuring distance, test date or model list. The linked Vitatech PDF couldn't be opened on Oct 13, 2026, so it's unclear whether Amplify III was tested.
Manufacturer claimSunlighten says its saunas are ETL-certified and points to the Intertek Directory to check.^{1, 5} Neither page gives a listing number or says which models are covered. The Intertek Directory search couldn't be loaded on Oct 13, 2026, 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 during a session.⁵ That summary is Sunlighten's. The APEX PDF couldn't be opened on Oct 13, 2026, so the models, dates and figures weren't checked.
Manufacturer claimSunlighten markets it as supporting detoxification, cardiovascular conditioning and muscle recovery.^{1, 6} These are the seller's marketing claims, not measurements of this cabin. This review didn't assess the studies behind them. Sunlighten's support page calls its products general wellness products, not medical devices.
Manufacturer claimSunlighten suggests beginners start with 10 to 15 minute sessions at 100°F every other day, with water before and after.^{1, 5} That's a usage suggestion, not evidence of a benefit. The safety page says to check with your health professional before using its saunas.