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Installed infrared cabin

HigherDOSE Full Spectrum Infrared Sauna

3-person Full-Spectrum Infrared Sauna

$8,999US price, checked Oct 15, 2026

Three-person infrared cabin that needs a 240 V circuit and publishes few details

Check price at HigherDOSE Full review →

Installed infrared cabin

Sunlighten Amplify III

3-person installed infrared cabin, eucalyptus/obsidian

$6,999US price, checked Oct 13, 2026

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

Check price at Sunlighten Full review →

Criterion	HigherDOSE Full Spectrum Infrared Sauna	Sunlighten Amplify III
US price	$8,999Checked Oct 15, 2026 · Price details in the review	$6,999Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$8,999 Incomplete known subtotal. Not included: installation, energy use.	$6,999 Incomplete known subtotal. Not included: installation, energy use.
Choose if	Two or three people who share sessions and can run a dedicated 240 V, 15 A circuit to the spot.	Two or three people who share sessions, with a dedicated 120 V, 20 A circuit and about 63 × 46 in of indoor floor.
Main trade-off	You can't return it once it's opened, and the warranty terms, heater details and safety listing aren't published.	Opened saunas can't be returned, and the product page skips wattage, top temperature and a safety listing number.
Key specifications	Electrical: 240 V on a dedicated 15 A circuit, rated at 2,930 W, with a NEMA 6-15P plug Inside: 57 in (dimension unlabeled) × 36.25 in deep × 70 in high. Exterior: 61 W × 41 D × 76.5 H in Weight: About 580 lb Top temperature: Up to 176°F, according to HigherDOSE. It suggests 110 to 130°F for sessions Heaters: Manufacturer-described carbon heaters, marketed as low-EMF and full-spectrum. Heater count is not stated Delivery: Curbside on a pallet for $999 plus tax, in 15 to 22 days. Installation isn't included Sizes: 3 Person at $8,999. 2 Person at $7,999, on 120 V with a dedicated 20 A circuit, 2,250 W and a NEMA 5-20P plug	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
Exact variant	3-person Full-Spectrum Infrared Sauna	3-person installed infrared cabin, eucalyptus/obsidian
Dimensions	HigherDOSE now lists the 3-person exterior as 61 W × 41 D × 76.5 H in. Its interior is listed as 57 in (the dimension is unlabeled), 36.25 in deep and 70 in high, at about 580 lb. The maker's current exterior dimensions differ from the 71 W × 48 D × 77 H in reported by Garage Gym Reviews, which may describe another version. Confirm the exact unit and installation clearances before measuring your room.	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.
Installation	It needs a dedicated 240 V, 15 A circuit. HigherDOSE rates it at 2,930 W with a NEMA 6-15P plug, so you'll need a matching NEMA 6-15 outlet. An upgraded cord is available on request. It ships separately, and you fit it yourself. The carrier leaves the sauna on a pallet, as far as it can get along the road or driveway. Delivery to a room of your choice costs extra, by quote from HigherDOSE's sauna sales team. Installation isn't included. No assembly time or manual is published, though the page embeds a "How to build" video. Garage Gym Reviews says its installers took about 7 hours.	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.
Materials	HigherDOSE describes the exterior as black mahogany and the interior as basswood. These are manufacturer descriptions, not independently verified species or emissions results. The finish and cabin-specific VOC testing remain unknown; the resource page's fabric test concerns the sauna blanket, not this cabin.	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.
Warranty	The product page promises a limited 5-year residential warranty and a 1-year commercial warranty. HigherDOSE's warranty page has no sauna section, only one-year terms for nine other products. It doesn't publish what the 5 years covers, so heaters, controls, labor, parts shipping and transfer are all unclear. Ask for the written sauna warranty before you order.	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.
Returns	HigherDOSE's return policy gives Full Spectrum Saunas 30 days from delivery, but only if unopened and in the original packaging. Every approved return carries a 30% restocking fee, about $2,700 at the 3-person price. You also pay all return shipping. The 120-day money-back guarantee in the site banner doesn't cover saunas. The policy was last updated May 8, 2025.	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.
Unresolved questions	Installation clearances and whether the delivered version matches the current published dimensions Heater count and placement Wood finish and cabin-specific VOC testing What the 5-year warranty covers, including labor and parts shipping, and whether it transfers Whether the cabin carries an ETL, UL or CSA listing, and its file number Measured EMF levels and how they were tested Average power draw and preheat time, and so the running cost Assembly time and what an installation manual would require, such as GFCI protection Whether it can run on 208 V service, which an independent review lists and HigherDOSE doesn't	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

These comparisons use published specifications, not head-to-head tests. Prices and terms are dated. Unknown costs are not zero. Check the exact variant before you buy.