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Dew-Not Heater Strip - 3" Scope

Dew-Not Heater Strip - 3" Scope

by Dew-Not
SKU DN004
CA$48.00 - CA$48.00
CA$48.00
CA$48.00 - CA$48.00
CA$48.00
Price Match Policy!
  • Fits 3" Telescope OTAs
  • 13.0" (33.0cm) Strip Length
  • 12" Heating Element Length
  • Draws 0.50A at 12V DC (6W)
  • Standard RCA Jack Connector
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Dew-Not Heater Strip for 3" Scopes

    The Dew-Not Heater Strip for 3" Scopes is engineered to deliver consistent, reliable dew prevention using a 12" long thick-film heating element housed in a 13.0" insulated strip. Operating at 12V DC, this heater draws just 0.50 amps (6W) to gently warm your optics, ensuring your views remain clear throughout the night. Its patented design provides even heat distribution, eliminating the dew that can end an observing session prematurely.

    Thick-Film Heating: 66% Surface Area for Even Dew Prevention

    Unlike conventional heaters that use a single resistance wire, the Dew-Not strip utilizes a thick-film heating element where 66% of the surface area actively radiates heat. This design produces remarkably even warmth across the entire 12" element length. The result is uniform temperature elevation that prevents dew from forming without creating localized hot spots or optical distortions.

    Built for 3" Scopes: 13" Length and 12V Operation

    With a total length of 13.0", this Dew-Not strip is sized specifically for 3" telescope optical tubes, providing full coverage for the objective lens cell. The exterior is cloth-covered with foam insulation to direct heat inward toward the optics, maximizing efficiency and minimizing power consumption. A strong Velcro closure ensures a snug, secure fit that won't slip during use, while the 6-foot cord and standard RCA jack offer plug-and-play compatibility with most 12V dew heater controllers.

    Dew-Not vs. Resistance Wire: A 20+ Year Patented Design

    The core technology in the Dew-Not heater is a significant departure from older resistance-wire designs, which are prone to burnouts and uneven heating. Backed by over 30 patents and more than 20 years of continuous refinement, the thick-film element offers superior durability and reliability. This robust, USA-made construction ensures your investment is protected against the common failure points of lesser dew heaters.

  • How do I know the Dew-Not DN004 will fit my 3" refractor?

    The Dew-Not DN004 has a total strip length of 13.0" (33.0cm), which is specifically designed to wrap around the outside diameter of a typical 3" telescope's dew shield or main tube. You can confirm the fit by measuring the circumference of your telescope where you plan to place the heater; if it's around 13 inches, this strip will provide a secure fit.

    What kind of dew controller do I need for this Dew-Not heater strip?

    This heater strip uses a standard male RCA jack and operates on 12V DC. It is compatible with virtually any dew controller system from major brands that use RCA-style outputs. The strip draws only 0.50A, making it a low-load addition to any multi-channel dew controller.

    Why is the heating element (12") shorter than the strip itself (13.0") on the Dew-Not DN004?

    The 12" heating element is the active portion of the strip. The overall 13.0" length includes the non-heating portion of the fabric strip that contains the Velcro closure. This design ensures that when you wrap the strip around your scope, only the heating element is in contact with the optical tube, and the overlap for the Velcro does not cause excessive heat buildup.

    Can I use the Dew-Not DN004 on my 50mm finderscope?

    No, the Dew-Not DN004 is too large for a 50mm (approx. 2") finderscope. A 50mm scope has a circumference of roughly 6.2 inches. The 13.0" length of this strip would be far too long to fit snugly. You should select a smaller dew heater strip designed for finderscopes or large eyepieces for a proper fit.

    How much power does the Dew-Not DN004 draw at 12V?

    The Dew-Not DN004 is highly efficient. At 12V DC, it draws a current of 0.50 amps, consuming 6 watts of power. This low power draw makes it an excellent choice for field use where battery life is a primary concern.

    What makes the Dew-Not heater different from cheaper resistance wire types?

    The key difference is the thick-film heating element. Unlike a single, fragile wire, this design features a broad, heat-emitting surface that covers 66% of the element's area. This provides more even heat distribution, eliminates hot spots that can affect optics, and is far more durable and resistant to the burnouts that commonly plague resistance wire heaters.

  • MPN DN004
    Heater Element Length 12"
    Strip Length 13.0" (33.0cm)
    Fit 3" Telescopes / OTAs
    Voltage 12V DC
    Power 6 W
    Current Draw 0.50 A

    • Dew-Not Heater Strip - 3" Scope

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  • Dew-Not Warranty