Sunlighten Signature IV Far Infrared Sauna
- Far infrared
- 4 people
- Up to 141-160°F
- 240V plug-in
SVT Score, Lower
A four-person indoor far infrared cabin with a reclining bench and ten carbon panels, on a dedicated 240 V circuit.
$7,799
We may earn a commission if you buy through this link. It never affects our scores. How this works
Usability
4.3 out of 10- Size: 80.9 by 56.1 by 77.7 in outside, 779 lb
- Glass: door not stated as tempered on the spec sheet
- Not included: app control, an adjustable vent and a backrest (backrests sold separately)
Better on features & water careSun Home Eclipse 4 infrared saunaAn app. $12,999Scores 7.0- Searched: Intertek CSA UL CPSC Health Canada
Better on verificationSun Home Luminar 5 outdoor sauna$13,899Scores 6.0- Returns: 30 days, unopened only, less a $499 restocking fee and a 3% fee
Better on warranty & supportHealth Mate Enrich 2 SaunaThe controls carry ten years. $5,300Scores 10.0Strengths
- Gentle far infrared heat from carbon panels
- Room for four with a large reclining bench
- Chromotherapy lights and Bluetooth audio built in
- Fabric covers over the infrared heaters
Drawbacks
- Less heater output for each seat
- Needs a higher-voltage outlet wired by an electrician
- Parts-only warranty with no labour cover
- Heavy panels need two people to assemble
- No app or Wi-Fi control
- Store pages make wellness claims we do not assess
Room for four in a simple cabin, but the heat is spread thin
Specs
- TypeInfrared
- HeaterFar infrared
- FormCabin
- PlacementIndoor
- Seats4 people
- Max Temperature141-160°F
- Min TemperatureNot applicable
- Capacity (Gallons)Not applicable
- ChillerNot applicable
- HeatsNot applicable
- Water CareNot applicable
- Power Supply240V plug-in
- EMF Claimed"Low EMF" with no figure
- EMF MeasuredNot measured
- CertificationsClaimed only
- Warranty3 Years
At a glance
- Ten carbon panels
- Two benches inside
- Side glass panel
- The company is based in Leawood, Kansas, and was founded in 1999.
- Sunlighten bought the assets of a cold-plunge maker in May 2025 and runs them as its subsidiary Ice Barrel, LLC.
- That subsidiary's own store also sells the Amplify line.
- Sunlighten, Inc. sells saunas from a one-person dome to four-person full spectrum cabins on its own US store, shop-us.sunlighten.com.
- Its mPulse cabins are sold through sauna consultants without a priced cart.
- No Sunlighten store or listing was found on Amazon US in November 2026.
The Sunlighten Signature IV is a four-person indoor far infrared cabin with ten SoloCarbon carbon panels drawing 2,750 W in total. It needs a dedicated 240 V 20 A circuit with a NEMA 6-20 outlet, fed by a 10 ft cord that leaves the roof.
It measures 80.9 by 56.1 by 77.7 inches outside and 74.8 by 50 by 70.3 inches inside, weighs 779 lb, and has a 28 inch door. The manual sets it to 150.8°F by default, and the brand gives 100 to 150°F as the range of its infrared cabins.
Chromotherapy lights, a Bluetooth sound system, fabric heater covers and a programmable timer with a reservation mode come with it. This listing is the Obsidian exterior with a eucalyptus interior; it has an adjustable reclining bench and a glass side panel. Backrests, cushions and comfort packages are sold separately.
Panels lock together with magnets and arrive by freight to the garage. Sunlighten's own 2020 report from Vitatech Electromagnetics gives 0.86 mG RMS for the Signature IV at the seated position.
Questions answered from our data
Is Sunlighten good?We list nine Sunlighten products and score nine of them. Their overall scores run from 3.9 to 5.1, with a median of 4.8, against a median of 5.3 for all 91 products we score.
How much does a home sauna cost?The 81 home saunas we list run from $1,999 to $36,399, with a median of $7,523.
How hot does a sauna get?Of the 81 home saunas we list, 81 state a rated maximum temperature; the most common is 186-194°F (42).
How big is a 2-person sauna?24 of the 81 home saunas we list seat two, as their makers count seats.
