Skip to content
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Dew-Not Heater Strip - 4" Scope

Dew-Not Heater Strip - 4" Scope

by Dew-Not
SKU DN005
$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00
Price Match Policy!
  • Length: 15.4" (39 cm)
  • Fits: 4" Telescope OTAs and Dew Shields
  • Power: 7.3 Watts at 12V DC
  • Current Draw: 0.61 Amps
  • Connection: 6' Cord with Molded RCA Jack
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Dew-Not Heater Strip - 4" Scope (DN005)

    The Dew-Not Heater Strip for 4" telescopes delivers reliable dew prevention using a patented thick-film design that applies heat across 66% of its 15.4" surface area. Operating at 12V DC, this strip provides 7.3 W of power with a minimal 0.61 A current draw, ensuring your field battery lasts through long nights. Unlike resistance-wire heaters, this US-made strip generates uniform warmth to keep optics clear without creating hot spots or tube currents.

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

    Dew-Not heaters replace failure-prone resistance wires with a patented thick-film element where 66% of the strip's surface radiates heat. This design eliminates the localized hot spots and potential burnouts common in wire-based heaters. The result is a gentle, evenly distributed warmth that raises your optic's temperature just above the dew point, preventing condensation without introducing image-degrading tube currents.

    Field-Ready Design: 15.4" Length and 7.3W Power Draw

    Engineered specifically for 4" telescopes, the 15.4" strip wraps securely around dew shields and main tubes using a durable Velcro closure. An outer layer of foam insulation directs heat inward toward the optics, maximizing efficiency and minimizing the 7.3 W power draw. The integrated 6-foot cord and standard RCA plug provide ample length and compatibility with virtually all common 12V dew heater controllers.

  • How is the Dew-Not DN005 heater different from resistance wire heaters?

    The Dew-Not DN005 uses a thick-film heating element that covers 66% of the strip's surface. This provides superior, even heat distribution and eliminates the risk of hot spots or burnouts that can occur with single-wire heaters. This method is more efficient and safer for your optics.

    Will the 15.4" Dew-Not heater strip fit my 4" refractor's dew shield?

    Yes, the 15.4" (39 cm) length is specifically calculated to wrap around the circumference of most 4" class telescope dew shields and optical tubes, including popular refractors and Maksutov-Cassegrains. The Velcro closure allows for a snug, secure fit.

    What kind of controller do I need for the Dew-Not DN005 heater?

    This Dew-Not heater strip uses a standard molded RCA jack and is designed to work with any 12V DC dew controller that uses RCA-style outputs. This includes controllers from major brands like Kendrick, Thousand Oaks Optical, and DewBuster.

    How much power does the Dew-Not 4" heater draw from a field battery?

    The strip consumes 7.3 watts of power, which translates to a current draw of 0.61 amps at 12V. This is a very efficient power draw, allowing you to run the heater for many hours on a typical portable astronomy battery without significant drain.

    Why is even heat important for my 4" telescope's optics?

    Evenly distributing gentle heat is critical for maintaining high-resolution views. Hot spots from wire heaters can create localized air currents (tube currents) inside your telescope, which distort the light path and soften fine details on planets like Jupiter or close double stars. The Dew-Not's uniform heating prevents this, preserving the crisp images your 4" scope is capable of.

    Does the Dew-Not DN005 heater require any special setup?

    No, setup is simple. Wrap the strip around your telescope's dew shield or main tube, secure it with the built-in Velcro, and plug the 6' cord's RCA jack into your 12V dew controller. There are no other components to assemble.

  • MPN DN005
    Fits Aperture 4" Telescopes
    Fits OTA Models 4" OTAs
    Strip Length 15.4" (39 cm)
    Heater Element Length 15.4"
    Voltage 12V DC
    Power 7.3 W
    Current Draw 0.61 A

    • Dew-Not Heater Strip for 4" Scope with 6' Cord

      × 1

  • Dew-Not Warranty