Sunlighten Signature IV 4-Person
Price at Sunlighten, last checked 2 Nov 2026. Price may vary. In stock at the seller when checked.
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Our take
The Sunlighten Signature IV 4-Person is a 4-person infrared cabinet for indoor use, sold by Sunlighten for $7,799 when we last checked on 2 Nov 2026. Among 82 infrared indoor saunas we list, its spec score ranks 53 of 82, and its price compares with a $3,399 median for the group.
Needs a dedicated 30A or 240V circuit. Budget for an electrician and, where required, a permit. Its published size leaves about 7.9 sq ft of footprint per seat.
Strengths
- Warranty: Sunlighten 7-year residential warranty on the cabinetry and heaters; 3 years on controls; 1 year on glass doors and audio. Parts only: labor and freight aren't covered, and it's void if not plugged straight into a dedicated wall outlet
- Strong heat for its type
- Roomy: about 7.9 sq ft of footprint per seat
Trade-offs
- Priced high for its specs: $7,799 against a $3,399 median for infrared indoor saunas
- Needs a dedicated 240V or 30A circuit, installed by a licensed electrician
- Maximum temperature not published
Good fit for
- Households of up to 4 at a time
Consider another option if you're
- Homes with no room in the panel for a new 240V circuit
- Anyone who wants hot stones and steam: this is infrared, with gentler air heat
- Anyone planning to install it outside: it isn't rated for outdoor use
- Tight budgets: similar saunas have a median price of $3,399
Specifications
| Brand | Sunlighten |
|---|---|
| Model | Signature IV 4-Person |
| Type | Infrared · indoor cabinet |
| Price | $7,799 last checked 2 Nov 2026 Sold only in the black Obsidian finish today; free freight shipping to the contiguous US (curbside on a pallet); 2–3 hours to assemble |
| Seller | Sunlighten (affiliate link) |
| Seller's list price | $8,399, as shown by the seller |
| Availability | In stock at the seller when checked |
| Shipping | Not published |
| Seats | 4, per the maker |
| Exterior W × D × H | 81 × 56 × 78 in source Height includes 2 in feet; panels fit a 30 in doorway |
| Footprint | 31.5 sq ft |
| Interior size | Not published on the listing |
| Heating | Far infrared panels |
| Maximum temperature | Not published |
| Electrical | 240V, 20A · 2,750 W source |
| Connection | Needs a dedicated 240V 20A circuit and outlet. Sunlighten's page lists the plug as NEMA 6-20P in one place and 5-20P in another; ask Sunlighten which outlet to install |
| What that means | Needs a dedicated 30A or 240V circuit |
| Wood | Eucalyptus interior, black Obsidian exterior |
| Warranty | Sunlighten 7-year residential warranty on the cabinetry and heaters; 3 years on controls; 1 year on glass doors and audio. Parts only: labor and freight aren't covered, and it's void if not plugged straight into a dedicated wall outlet source |
| Indoor or outdoor | Indoor |
| Listed features | Bluetooth, Color lighting |
Interior size, heater model (for infrared) and the largest delivered piece aren't on the seller's listing. Check with the seller before you buy.
Rating breakdown
How its Fair spec rating breaks down by category, each compared with similar saunas. Full method.
| Construction & durability | Not published, left out |
|---|---|
| Value | Basic |
| Heating | Excellent |
| Warranty & support | Strong |
| Installation | Basic |
| Features | Not scored |
| Appearance | Not rated yet |
| Space & capacity | Strong |
Dimensions and installation
- Power. Needs a dedicated 30A or 240V circuit (240V, 20A · 2,750 W). Have a licensed electrician confirm your panel and wiring before you order.
- Floor space. The maker doesn't publish clearances here, so Make Sure It Fits assumes 3 in at the sides and back: plan on about 87 × 59 in of floor.
- Ceiling. At 78 in tall plus our 6 in allowance above, you'd want a ceiling of at least 84 in. Confirm with the manual.
- Doorways. The listing doesn't give the largest delivered piece, so measure your narrowest door or gate and ask the seller.
Running cost estimate
At its rated 2,750 W, four 45-minute sessions a week (warm-up included) at the U.S. average of 18.3¢ per kWh (EIA) come to about $7 a month, or $79 a year. This is an estimate, not a quote: heaters cycle off once hot, so most owners pay less. Use your own rate in the True Cost calculator.
Warranty and support
Sunlighten 7-year residential warranty on the cabinetry and heaters; 3 years on controls; 1 year on glass doors and audio. Parts only: labor and freight aren't covered, and it's void if not plugged straight into a dedicated wall outlet. source Orders, delivery and warranty claims go through Sunlighten, the seller, and Sunlighten, the maker. Read the written warranty before you buy, because outdoor use and self-installation can change the terms. Our warranty guide lists the questions to ask.
Check current price & availability
Price at Sunlighten · last checked 2 Nov 2026 · price may vary
- Shipping and delivery details on the seller's page ↗
- Compare similar saunas
- See if it fits my space
- Estimate the five-year cost
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Related guides
Sources
Price, size, power and warranty come from the seller's listing here, last checked 2 Nov 2026. Prices change often; the seller's page is the final word. Recall status: not part of the 17 Sept 2026 CPSC sauna recall, the recall we checked. We haven't tested this sauna in person. Electrical details are preliminary and don't replace a licensed electrician.
Independent by design. We order saunas with our published method. Cedar Scout may earn a commission when you buy through affiliate links on this page. Commissions never change which saunas appear, their scores or their order. How we earn money.