Celestron 11-inch Dew Heater Ring (Part #94053)
Direct-glass heating for 11" SCT, EdgeHD, and RASA optical tubes
When you own a premium 11" Celestron OTA, whether it's a classic SCT, an EdgeHD, or a RASA imaging platform, there's no reason to trust your night to a $20 heater strap wrapped around a metal tube. Dew doesn't form on your front cell—it forms on your corrector glass. That's exactly where the Celestron Dew Heater Ring goes to work.
Engineered as a direct drop-in replacement for your stock retaining ring, the 11-inch Dew Heater Ring applies heat exactly where you need it—at the source—making it vastly more efficient than traditional heating bands. It's not just smarter, it's permanent, seamless, and rock solid in the field.
How it works
The 11" Dew Heater Ring replaces the plastic or metal retaining ring on your corrector plate with a precision-machined, velvet-lined aluminum frame. Inside this rigid housing is an integrated resistive heater and a built-in thermistor sensor—ready to plug directly into Celestron’s Smart DewHeater Controllers for automatic, ambient-aware thermal regulation.
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Heats the glass directly, not the housing, for maximum efficiency
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Thermistor feedback enables fine-tuned power management through compatible controllers
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Slim, lightweight design keeps your scope balanced and protected
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Built-in storage clips hold power and sensor leads securely when not in use
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Cable management clip attaches to the OTA for clean routing and strain relief
Whether you’re observing under dew-prone skies or capturing deep-sky data through long exposure runs, this ring keeps your optics clear without overheating or over-draining your battery.
Installation
If your OTA was built in 2006 or later (look for the trilobed rear cell), this ring fits perfectly. Use the included paper installation shield to protect the corrector during the swap, then remove the stock retaining ring, place the Dew Heater Ring in its place, and reinstall the screws. Once mounted, the ring becomes a permanent, worry-free part of your telescope.
Technical Specs
| Feature |
Description |
| Max Power Draw |
30 watts @ 12V DC |
| Power Connector |
5.5mm × 2.1mm barrel jack (tip positive) |
| Thermistor Jack |
2.5mm audio-style plug, Smart Controller compatible |
| Extension Cable |
6″ long, RCA-to-barrel connector |
| Ring Construction |
Anodized aluminum with velvet inner lining |
| Compatibility |
11″ SCT, 11″ EdgeHD, 11″ RASA OTAs |
| Inner Diameter |
279.4 mm (11.0″) |
| Outer Diameter |
305.3 mm (12.02″) |
| Weight |
4.69 oz (133 g) |
California Proposition 65 Warning applies due to standard manufacturing material disclosures.
Observing Tip
Pair this ring with a dew shield to reduce the heater’s workload and maximize your battery life. With a Smart Controller regulating heat via thermistor input, you’ll barely notice the power draw—but you’ll always notice a clear corrector.
Final Thoughts
For the 11" SCT owner who doesn't want to mess with temporary solutions, this is the elegant, permanent answer. No slipping straps, no fiddling with placement, and no guessing if it’s warm enough. The Celestron Dew Heater Ring is built to work seamlessly with your telescope—and just as hard as you do under the stars.
The Dew Heater Ring comes complete with:
- Dew Heater Ring
- Cable management clip
- Power jack extension cable
- Paper installation shield
Newer generation Celestron SCTs built in the year 2006 or later are compatible with the Dew Heater Ring. These newer OTAs have a trilobed shape on the rear cell. In addition, newer generation 14" SCTs have a rounded rear cell. See photo examples below. All EdgeHD, RASA, 6” Schmidt-Cassegrain and 9.25” Schmidt-Cassegrain telescopes are compatible with the Dew Heater Ring.
