Sauna warranties compared: what "lifetime" actually covers
Nearly every premium sauna brand says "lifetime warranty." Read the terms and you'll find seven-year caps, heaters excluded, outdoor shells on a different clock, and "limited" doing a lot of work. Here's what each brand's warranty really says, side by side, and how to read one.
How to read a sauna warranty
- What's covered separately. Most split heaters, wood/cabinetry, electrical/controls, and sometimes glass and accessories, each with its own term. The heater and controller terms are the ones that matter; they're what fails.
- "Lifetime" and "limited lifetime." Often means the expected product life as defined by the brand (frequently seven years) or the original owner's ownership. Look for a number of years in the fine print.
- Residential vs commercial. Residential terms are long; put the same sauna in a gym and it drops to one or two years.
- Indoor vs outdoor. Outdoor shells and roofs usually get a much shorter term than the interior.
- Labor and shipping. A heater panel might be covered for life while you pay to ship it and install it. Brands with in-home technician service (Sun Home, Peak) are rare.
- Returns. A trial period (Relaxe 365 days, Redwood and Sweat Kingdom 30 days) is separate from the warranty and often more useful. Watch for restocking fees (SweatTent charges 30%).
- Transferability. Most warranties end when the sauna changes hands, which matters if it stays with the house.
Brand by brand
Wording summarized from each brand's published terms as of October 2026. Terms change; confirm on the brand's site before buying. This is the same warranty data that feeds 25% of our heat score.
| Brand | Warranty |
|---|---|
| Clearlight | Limited lifetime residential warranty (indoor), including heaters and controls; 5 years on outdoor shell |
| Health Mate | Lifetime on Tecoloy heaters; limited lifetime on most components |
| HigherDOSE | 1 year on the blanket; 5 years residential on the full-size sauna |
| Hydragun | Up to 1.5 years; 30-day returns |
| JNH Lifestyles | 1 year (Joyous); 2 years heaters / 1 year cabinet (Ensi, Tosi); 7 years (Arki) |
| MiHIGH | 12 months |
| North Shore Sauna | Not published |
| Peak Saunas | 7-year residential warranty (marketed as limited lifetime); in-home technician |
| Plunge Sauna | 24 months, extendable to 3 years |
| Redwood Outdoors | 1-year limited; 30-day money-back guarantee |
| Relax Sauna | Not published |
| Relaxe Saunas | 3 years comprehensive (heaters, electronics, wood); 365-day trial |
| SaunaBox | Not published |
| Sun Home Saunas | Limited lifetime (capped at 7 years in the terms) on cabinetry and heaters; 3 years on controls; in-home technician service |
| Sunlighten | Lifetime on SoloCarbon heaters; 7 years on wood and electrical; 5 years on controls |
| Sweat Kingdom | 3-year limited; 30-day satisfaction guarantee |
| SweatTent | 1-year limited; 30% restocking fee on returns |
| Therasage | 2 years (Thera360 Plus) |
Who comes out ahead
- Strongest on paper: Clearlight (limited lifetime indoor, including heaters and controls), Health Mate (lifetime on heaters), Sunlighten (lifetime heaters, 7 years wood and electrical).
- Strongest in practice: Sun Home and Peak, because in-home technician service means a covered failure doesn't become your project; and Relaxe, because a year-long trial covers the most common regret, which isn't a defect at all.
- Shortest: the budget tier (JNH Joyous, MiHIGH, SweatTent, Redwood Outdoors at 1 year). Not a reason to avoid them; a reason to price them accordingly.
Questions to ask before you buy
How many years, in numbers, on the heaters and the controller?
If the answer is "lifetime," ask what lifetime means in the terms.
Who pays shipping and labor on a claim?
Is there a return window, and is there a restocking fee?
Does the warranty transfer if I sell the house?
What voids it?
Outdoor placement of an indoor model, commercial use, and non-approved electrical work are the usual ones.