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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 RED III

3-person infrared cabin with integrated red-light configuration

$8,599US price, checked Oct 13, 2026

Three-person cabin with built-in red light that needs a 240 V circuit

Check price at Sunlighten Full review →

Criterion	HigherDOSE Full Spectrum Infrared Sauna	Sunlighten Amplify RED III
US price	$8,999Checked Oct 15, 2026 · Price details in the review	$8,599Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$8,999 Incomplete known subtotal. Not included: installation, energy use.	$8,599 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 want red light built into their sauna and can add a dedicated 240 V, 20 A circuit.
Main trade-off	You can't return it once it's opened, and the warranty terms, heater details and safety listing aren't published.	You pay $1,600 extra for red light with no published wavelength or dose, and opened saunas can't be returned.
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 far-infrared, 5 near-infrared red-light and 3 full-spectrum heaters. The red light's wavelength and output aren't stated Electrical: 240 V, 3,465 W and 14.44 A, on a dedicated 20 A circuit with a NEMA 6-20R outlet Inside and bench: 56.8 W × 39.9 D × 70.3 H in inside. The bench is 56.6 W × 20.2 D in and 19.5 in off the floor Top temperature: Up to 170°F, which Sunlighten qualifies with "in ideal conditions" Heat-up: Sunlighten suggests preheating for 45 to 60 minutes. It says the cabin warms about one degree per minute, depending on room temperature Weight and delivery: 710 lb in two to three boxes on a pallet, left in your garage or driveway. Two people assemble it in about 2 to 3 hours Extras: Chromotherapy lighting and a sound system Options: The 2-person Amplify RED II costs $900 less and the 4-person Amplify RED IV $1,700 more. Without red light, the same-size Amplify III Eucalyptus is $1,600 less
Exact variant	3-person Full-Spectrum Infrared Sauna	3-person infrared cabin with integrated red-light configuration
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 56.6 in wide and 20.2 in deep, 19.5 in off the floor. The eucalyptus model weighs 710 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 240 V, 20 A circuit and a NEMA 6-20R outlet for its 6-20P plug. Sunlighten tells you to book your electrician early so the outlet is ready on build day. Its FAQ says a power strip or converter voids the warranty. The warranty page also rules out extension cords and non-dedicated circuits. It requires at least 5 ft between the sauna and any source of water or vapor. The product page doesn't mention GFCI protection or clearance around the cabin. Freight arrives in two to three large boxes on a pallet, left in your garage or on a flat, paved driveway spot. The carrier calls first to schedule. The panels lock together with Magne-Seal corners, without screws or nails. Sunlighten says two people take about 2 to 3 hours. Its guides page has manuals and assembly guides for the standard Amplify II, III and IV, but none listed under Amplify RED.
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.	Eucalyptus tongue-and-groove boards on solid wood framing, which Sunlighten calls sustainably sourced and non-toxic. Basswood and Obsidian finishes were marked not available for this model. One line on the page says its saunas are made of basswood, which conflicts with the eucalyptus selection. Sunlighten says the glue on its boards 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. Cabinetry includes benches, floor grates and heater cover frames. Controls include the control pad, in-sauna tablet and power box. Commercial use gets 5 years on the cabinet and heaters and 1 year on everything else. The cabin terms don't single out the red-light heaters. The general terms cover replacement parts only. Labor and technician costs aren't covered. You pay all freight, including on parts shipped for service. Coverage is for the original buyer only and ends if you sell the sauna. It's void on a power strip, extension cord, converter or non-dedicated circuit, or within 5 ft of water. Outdoors, the plastic sheet of the sauna cover (sold separately) must stay on at all times, even during sessions. The sauna must 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 can be returned within 30 days of delivery, but only unopened in the original packaging. Opened saunas can't be returned. Fees can include a 3% administrative fee, a $499 restocking fee per Amplify sauna, storage fees and return shipping. Cancelling before it ships can cost the 3% fee, plus storage fees if it has to be rerouted.
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 red-light heaters' wavelength and irradiance, and whether they run at the same time as the far-infrared heaters Average power use during a session, and so the yearly running cost Whether the circuit needs GFCI protection, and how much clearance to leave around the cabin What the linked Amplify RED III spec sheet adds, since it couldn't be opened on Oct 13, 2026 Whether an ETL listing covers this exact model, and its file number What the Vitatech EMF test measured, at what distance, and whether it included the red-light heaters Whether it's in stock, since the product page and Sunlighten's store listing disagreed The lifespan and replacement price of the full-spectrum and red-light heaters Whether the $8,599 sale price lasts past 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.