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Astrozap Heater Strap for 3-inch Telescope Apertures
Astrozap Dew Heater – 3" Objective Telescopes (AZ-703)
An Astrozap dew heater strap for telescopes with 3" objectives. It warms the optics slightly above ambient temperature to stop dew forming during an observing session.
Power
The heater needs an Astrozap D/C adapter (AZ-719) or the Astrozap dual-channel dew controller (AZ-720) to be powered; neither is included. Astrozap warns that using a dew controller of another brand can cause damage and void the warranty.
Specifications
Model
AZ-703
Fits
telescopes with 3" objectives
Heater length
12" (305 mm)
Power
7.2 W at 12 V
Current
0.60 A
Power source
AZ-719 D/C adapter or AZ-720 controller (sold separately)
Manufacturer documentation
Astrozap AZ-703
Compatibility notes AZ-703. Requires AZ-719 or AZ-720 (not included).
Reference
11847
Data sheet
Current (A)
0.60
Fits
telescopes with 3" objectives
Length
12" (305 mm)
Model
AZ-703
Power (W)
7.2 W @ 12 V
Power source
AZ-719 / AZ-720
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Manufacturer model: Astrozap AZ-703 · Specifications checked against manufacturer data on 2026-11-03