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July 1st: Store will be closed for Canada Day. Orders placed that day will ship on July 2nd.
Celestron Dew Heater Ring - 8"
Celestron Dew Heater Ring - 8"
Celestron Dew Heater Ring - 8"
Celestron Dew Heater Ring - 8"
Celestron Dew Heater Ring - 8"

Celestron Dew Heater Ring - 8"

by Celestron
SKU CEL-94051
CA$78.00 - CA$78.00
CA$78.00
CA$78.00 - CA$78.00
CA$78.00
Price Match Policy!
  • Permanently mounts to 8" SCT, EdgeHD, and RASA telescopes
  • Directly heats corrector glass for maximum efficiency
  • 20 watts of heating power prevents dew in all conditions
  • Integrated thermistor for smart control with Celestron controllers
  • Lightweight 3.05 oz (86.5 g) aluminum construction
6 in stock
Qualifies for FREE Shipping in Canada on orders over $500.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Celestron Dew Heater Ring - 8"

    The Celestron Dew Heater Ring for 8" telescopes is a permanent, integrated dew prevention system that delivers up to 20 watts of power directly to your corrector plate. This lightweight, 86.5 g aluminum ring replaces the stock retaining ring on your 8" Schmidt-Cassegrain, EdgeHD, or RASA, providing the most efficient heat transfer possible by warming the glass itself. Powered by an external 12V DC source, it ensures your optics remain clear all night, every night.

    Direct Corrector Heating: A 20-Watt Permanent Dew Solution

    Unlike conventional heater strips that warm the lens cell and waste energy, the Celestron Dew Heater Ring's aluminum frame makes direct contact with the corrector lens. This method provides a highly efficient and uniform transfer of heat with a maximum power of 20 watts, preventing dew from forming even on the most humid nights. Because it replaces your telescope's original plastic retaining ring, it becomes a permanent part of your optical tube—ready for any observing session without extra setup time.

    Integrated Power and Data: 12V DC Input and 2.5mm Thermistor Output

    The ring is powered by a standard 12V DC barrel connector (5.5mm/2.1mm, tip positive), a common interface for astronomy accessories. A 6" extension cable is included to adapt the power jack to a male RCA connector, offering flexibility with various power sources and dew controllers. An integrated thermistor with a 2.5mm audio jack output allows the ring to feed real-time temperature data to a Celestron SmartHeat Dew Controller, enabling precise, automated power management.

    Seamless Integration: 86.5g Aluminum Ring with Cable Management

    Engineered for a perfect fit, the durable aluminum ring weighs just 3.05 oz (86.5 g), adding negligible weight to your optical assembly. The design incorporates two built-in storage clips that neatly secure the power and thermistor jacks when not in use, allowing the telescope's original dust cover to fit perfectly. An included cable management clip attaches to the front cell, preventing the power cords from dangling and placing strain on the connections.

    Smart Control Ready: Maximize Efficiency with Celestron Controllers

    For optimal power efficiency and battery life, pair the Dew Heater Ring with a Celestron SmartHeat Dew Controller (sold separately). The controller utilizes the ring's built-in thermistor to apply the precise amount of power needed based on corrector temperature and ambient conditions. This intelligent system dramatically reduces power consumption compared to a continuous-on state. While the ring works with any 12V DC source, the thermistor function is exclusively compatible with Celestron SmartHeat controllers.

  • What is the advantage of the Celestron Dew Heater Ring over a standard heater strip for my 8" SCT?

    The primary advantage is efficiency. The ring heats the corrector glass directly, preventing dew with less power and more uniformity than a strip that heats the metal lens cell. It also becomes a permanent part of your telescope, so you never have to wrap, unwrap, or forget it.

    Do I need a special controller to use the 8" Dew Heater Ring?

    No, you can power the ring directly from any 12V DC power source with a 5.5mm/2.1mm barrel connector. However, to use the built-in thermistor for automated, power-saving operation, you must use a Celestron SmartHeat Dew Controller.

    Will the 8" Dew Heater Ring fit under my telescope's dust cover?

    Yes. The ring is designed with two storage clips that hold the power and thermistor jacks securely out of the way, allowing the original dust cover to be placed on the telescope as usual.

    I have an 8" EdgeHD telescope. Is the installation difficult?

    The installation is straightforward and designed to be done once. It involves carefully removing the telescope's existing retaining ring and replacing it with the Dew Heater Ring. Following the included manual and using the paper installation shield ensures a quick and safe process.

    How much power does the Dew Heater Ring use on a humid night with my Celestron RASA 8?

    The ring has a maximum power draw of 20 watts. When connected directly to a 12V DC source, it will run continuously at this power. When used with a SmartHeat Dew Controller, the power draw will be significantly less, as the controller will cycle the power on and off to maintain a temperature just above the dew point, conserving battery life.

    Can I use the built-in thermistor on the Dew Heater Ring with my third-party dew controller?

    No. The integrated thermistor and its 2.5mm jack are specifically designed to be compatible only with Celestron SmartHeat Dew Controllers. You can still power the ring's heating element with a third-party controller, but you will not be able to use the temperature-sensing feature.

  • Compatibility 8" Schmidt-Cassegrain, EdgeHD, Rowe-Ackermann Schmidt Astrograph (RASA)
    Ring Construction Aluminum
    Inner Diameter 203.2mm (8")
    Outer Diameter 225.6mm (8.88")
    Weight 3.05 oz (86.5 g)
    Max Power 20 watts
    Power Jack 12V DC barrel connector, 5.5mm/2.1mm, tip positive
    Thermistor Jack 2.5mm audio jack (For Celestron SmartHeat Dew Controllers)
    Extension Cable 6" long, 12V DC, 5.5mm/2.1mm to male RCA connector, tip positive

    • Dew Heater Ring - 8"

      × 1

    • Cable Management Clip

      × 1

    • Power Jack Extension Cable

      × 1

    • Paper Installation Shield

      × 1

  • Celestron 2-Year Warranty