Sunlighten vs Clearlight: Heat vs Long-Term Reliability
Sunlighten vs Clearlight: the Amplify II runs about 25°F hotter, while the Sanctuary 2 has the strongest long-term owner record and a lifetime warranty.
The short answer
Choose Sunlighten's Amplify II if you want the most heat (owners report 165–168°F). Choose Clearlight's Sanctuary 2 if you want the best long-term reliability record and a lifetime residential warranty, accepting cooler sessions of around 140°F.
Sunlighten vs Clearlight at a glance
| Heat | Sunlighten Owners report a steady 165–168°F in the Amplify II vs around 140°F in the Sanctuary 2. |
|---|---|
| Long-term reliability | Clearlight Owners report 4, 5, 6 and 7 years of trouble-free use; heater claims honoured quickly. |
| Warranty | Clearlight Limited lifetime residential warranty vs 7 years on Amplify II cabinet and heaters. |
| Door seal and draughts | Sunlighten Owners note less glass and a better seal than the Sanctuary, which has a gap at the door. |
| Price | Sunlighten About $5,800–$6,000 vs about $7,000–$8,000 for the Sanctuary 2. |
| App and connectivity | Neither Clearlight remote start often fails after a few years; Amplify II Bluetooth can be finicky. |
Specs side by side
| Sunlighten Amplify II | Clearlight Sanctuary 2 | |
|---|---|---|
| Type | Full-spectrum infrared | Full-spectrum infrared (full-spectrum front, far infrared elsewhere) |
| Capacity | 2 people | 2 people (snug for two adults) |
| Max temperature | Up to 170°F (owners report a steady 165–168°F) | Not published; owners report around 140°F |
| Power | 120V | 120V, dedicated 20A circuit (NEMA 5-20 plug) |
| Warranty | 7 years cabinet and heaters, 3 years controls, 1 year stereo | Limited lifetime (residential) |
| Price | About $5,800–$6,000 | About $7,000–$8,000 |
| Best for | The hottest indoor infrared session | Buyers who want a sauna that lasts a decade or more |
Specs from manufacturer pages; prices checked October 2026.
Sunlighten and Clearlight are two of the most-searched infrared sauna brands in the US, with about 11,000 and 9,500 monthly searches respectively. Comparing their flagship two-person cabins, the Sunlighten Amplify II and the Clearlight Sanctuary 2, comes down to a clear trade-off as of October 2026: Sunlighten runs about 25°F hotter, while Clearlight has the stronger long-term reliability record and warranty.
Heat: Sunlighten wins clearly
The Sunlighten Amplify II is the hottest 120V infrared cabin we found. An owner reports a steady 165–168°F, even after opening the door mid-session. Halogen full-spectrum heaters drive the air temperature up, and the front heaters are angled toward you when seated.
The Clearlight Sanctuary 2 runs cooler. Clearlight doesn’t publish a maximum, and owners typically see around 140°F. One owner of Clearlight’s Premier model reached 142°F after two hours of preheating, and another said it heated more slowly than expected. An owner who used both says they “like the Sunlighten significantly more”, citing heater placement and the Sanctuary’s door gap, which lets cool air in.
Reliability: Clearlight wins clearly
Clearlight’s owner record is the strongest of any infrared brand we researched. Owners report 4, 5, 6 and 7 years of reliable use at two to three sessions a week. One six-year Sanctuary 2 owner says a failed heater was replaced “immediately”. Clearlight holds 4.4/5 on Trustpilot from about 1,695 reviews.
Sunlighten’s record is more mixed. It has 4.6/5 from about 4,080 Trustpilot reviews, but a vocal group of owners report heater panels, power boxes or control screens failing, and slow repairs. See our Sunlighten Amplify II review for details.
Warranty
- Clearlight: limited lifetime residential warranty on heaters, electrical and wood. Owners note replacement parts are shipped for you or an electrician to fit.
- Sunlighten Amplify II: 7 years on cabinet and heaters, 3 years on controls, 1 year on stereo.
Price
As of October 2026, the Amplify II lists at about $5,800–$6,000 and the Sanctuary 2 at about $7,000–$8,000. Sunlighten is the better value on paper. Clearlight’s price buys the warranty and track record.
Technology
Neither brand gets top marks for software. Several Clearlight owners report remote start failing after a router change or a few years. One got a new power supply mailed free, and another had a technician sent twice. An Amplify II owner reports finicky Bluetooth audio. Pay for heat and build, not apps.
Which should you buy?
- Choose Sunlighten if you love intense heat and want the best price for a premium cabin.
- Choose Clearlight if you want the best odds of a decade or more without problems, and gentler heat suits you.
A note on our recommendations: Clearlight’s affiliate program excludes its saunas, so we don’t earn a commission on the Sanctuary 2. We’ve included it here because it belongs in any honest Sunlighten comparison.
FAQ
Is Sunlighten or Clearlight better?
Sunlighten's Amplify II is better for heat, with owners reporting 165–168°F. Clearlight's Sanctuary 2 is better for long-term reliability and warranty, with owners reporting 4–7+ years of use and a lifetime residential warranty.
Which gets hotter, Sunlighten or Clearlight?
Sunlighten's Amplify II. Owners report a steady 165–168°F, while Clearlight Sanctuary owners typically see around 140°F, and one Premier owner topped out at 142°F after two hours.
Which has the better warranty?
Clearlight, with a limited lifetime residential warranty covering heaters, electrical and wood. Owners note parts are shipped for self or electrician installation. The Amplify II has 7 years on the cabinet and heaters and 3 years on controls.