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Kendrick FireFly Heaters

FireFly Heaters

Our Firefly Heaters require the purchase of one of our controllers. Our FireFly Heater Systems all operate from 12 Volts DC.

We have heater systems for virtually any optic or electronic device used in amatuer astronomy and outdoor photography. They are designed to keep them functioning and moisture free in humid and/or cold weather. If you cannot find what you are looking for here, you should be able to find it on the other heater products pages on our site.

Kendrick's FireFly heaters are designed for the astronomer who requires a dew prevention system that is both economical in price and power. Although unable to perform up to the high standards as our original Premier brand of heaters, astronomers and anyone else requiring heated optics for dew prevention can depend on our FireFly heaters to perform under all but the most demanding observing conditions. Note that if your observing site gets temperatures that approach freezing on the nights you like to observe, you should consider the Premier line of heaters.

Having lower power requirements than our Premier heater line, these heaters will extend the life of your battery between charges. Using a different heater technology but operating under the same principle as our Premier line of heaters, these heaters will mildly disperse heat into your optics without compromising the figure of your telescope or camera optics.

As well, because of our unique manufacturing process, the FireFly heaters will direct their heat into your optics instead of losing it into the atmosphere. We have had these heaters independently tested for heat transmission and the resulting images below clearly show the effectiveness of our build technology. These heaters are very effective in directing most of the heat into the optics which is important if dew is to be prevented.

AN IMPORTANT NOTE: Some competing manufacturers of dew heaters make claims that their heaters, with half the wattage of our Premier line of heaters, will perform just as well as our Premier heaters, often at a much lower price! Well, this is true to a point but once you get down to temperatures approaching freezing, forget it, it just ain't gonna happen! You cannot escape the laws of Physics. Half the wattage means half the power, end of story. We make no such claims about our FireFly heaters. They do have their limitations. Lastly, our Firefly heaters use the same heater technology as our competitors but have the same high build quality as our Premier heaters, with features that our competitors do not.
The above image shows the outward facing surface of a Firefly heater.
The above image shows the inside, or optic heating side of a FireFly heater. This surface shows a +20º C difference from the outward facing surface proving the effectiveness of our manufacturing process in directing the heat into your optics.

2003-FFR FireFly Telrad & Rigel Quik Finder Heater CAN $37.00
2004-FFR .965 inch Eyepiece Heater CAN $49.00
2005-B1-FFR Bino-viewer Heaters for eyepieces up to 1.5 inch barrel diameter. CAN $69.00
2005-B2-FFR Bino-viewer Heaters for eyepieces over 1.5 inch barrel diameter. CAN $76.00
2005-FFR 1.25 inch Eyepiece Heater CAN $53.00
2006-FFR 2 inch Eyepiece Heater CAN $54.00
2007-FFR Heater for 3 inch Optic CAN $57.00
2008-FFR Heater for 4 inch Optic CAN $60.00
2009-FFR Heater for 5 inch Optic CAN $62.00
2010-FFR Heater for 6 inch Optic CAN $65.00
2011-FFR Heater for 7/8 inch Optic CAN $65.00
2012-FFR Heater for 9/10 inch Optic CAN $66.00
2013-FFR Heater for 11 inch Optic CAN $70.00
2014-FFR Heater for 12 inch Optic CAN $75.00
2015-FFR Heater for 14/16 inch Optic CAN $95.00
Red Dot Finder Heater
2003-RDF Heater for Red Dot Finder - Press Fit. CAN $25.00

Attaching Heaters
Firefly heaters wrap around the barrel or tube containing your optics, label side out and are held in place by elastic/Velcro attachments. Place the heater around the telescope tube or camera lens as close to the optics as possible (ie: not over a dewcap where you would only be heating air). In an instance where a dewcap is in the way, place the heater behind the dewcap.

We use high quality Velcro, elastic and connectors with these heaters. All the FireFly heaters come branded with our permanent, white identification label for easy identification in the field.

Eyepiece Heaters
Customers regularly ask if eyepiece heaters are necessary. They are just as much a necessity as the heater for the main lens or mirror in your telescope. In cool environments, moisture from your eye condenses on the eyepiece glass and without heat, is very difficult or impossible to remove.

We manufacture four sizes of eyepiece heaters:

  • #2003-FFR - for eyepieces on finderscopes.
  • #2005-FFR - for 1.25" eyepieces and that do not have a huge body (For example: Plossls, Vixen Lanthanum and similarly sized eyepieces).
  • #2006-FFR - for larger bodied (but not massive) 1.25" and 2" eyepieces (For example: Baader Hyperion and Orion Stratus eyepieces).

If you own some of the modern massive bodied eyepieces such as, but not limited to, Televue's Naglers, Ethos and Delos, Celestron's Lumina eyepieces or Explore Scientific's eyepieces, you really should consider our #2006-L DEW-Minator Large Eyepiece Heater. It is designed specifically for these large eyepieces and will provide the necessary heat to keep them free of dew and frost.

Heater Specifications

Note Wattage specs of the #2004-FFR, #2005-FFR and #2006-FFR heaters are very similar or identical to our Premier Heaters but as our Premier Heaters are half the width of these particular heaters, their watt density is double that of the FireFly version, making them a warmer heater and giving them a higher performance value.

Item No.HeaterWattageAmperage
2003-FFRTelrad Heater20.2
2004-FFR.965" Eyepiece Heater1.60.2
2005-FFR1.25" Eyepiece Heater2.50.2
2006-FFR 2" Eyepiece Heater3.50.3
2007-FFR3" Optic Heater60.5
2008-FFR4" Optic Heater70.6
2009-FFR5" Optic Heater80.6
2010-FFR6" Optic Heater90.7
2011-FFR7/8" Optic Heater141.1
2012-FFR9/10" Optic Heater171.3
2013-FFR11" Optic Heater181.4
2014-FFR12" Optic Heater201.6
2015-FFR14/16" Optic Heater231.8
2005-B1-FFRBino-viewer Heaters for eyepieces up to 1.5 inch barrel diameter.60.5
2005-B2-FFRBino-viewer Heaters for eyepieces over 1.5 inch barrel diameter.80.6


Heater Extensions

We offer these heater extension cables as sometimes the standard 4' power lead length is not enough for your application. If you require longer extensions than what is offered below, please contact us.

2000-EXT10 10 foot (3000mm) Heater extension CAN $45.00
2000-EXT12 12 foot (3660mm) Heater extension CAN $51.00
2000-EXT2 2 foot (600mm) Heater extension CAN $23.00
2000-EXT4 4 foot (1200mm) Heater extension CAN $30.00
2000-EXT8 8 foot (2400mm) Heater extension CAN $42.00


Fitting Dimensions

The table below will help you to determine which FireFly Heater is the right one for you scope.

.965"for .965" eyepieces and finder scope eyepieces
1.25"for 1.25" eyepieces
2"For 2" eyepieces, 50 mm finder scope objectives, smaller camera lenses. Can also be used on 1.25" oculars but a bit big. To use on 1.25" oculars just slip heater off 2" eyepiece and hang over 1.25" eyepiece.
3"will fit 3.5" to 5" OD (90mm to 130mm OD)
4"will fit 5" to 5.5" OD (130mm to 145mm OD)
5"will fit 5.5" to 6.5" OD (140mm to 165mm OD)
6"will fit 6.5" to 8" OD (165mm to 200mm OD)
7/8"For Meade 7" refractor, 7" Maksutov-Cassegrain, 8" SCT, Celestron C8, Astro Physics 7" Refractor. Will fit 8" to 9.5" OD (200mm to 250mm OD)
9/10"For Celestron C9.25, Meade 10". Will fit 10" to 12.5" OD (250mm to 310mm OD)
11"For Celestron C11. Will fit 12.5" to 13.5" OD (310mm to 340mm)
12"For Meade 12 SCT. Will fit 13.5" to 15.5" OD (340mm to 400mm OD)
14/16"For Celestron C14 & Meade 16" SCT. Will fit 15.5" to 18" OD (400mm to 460mm OD)


How To Use The System

Our Firefly Heaters require the purchase of one of our controllers which can found at this link. Our systems are all 12 VDC.

We recommend that you put your heaters in place at the beginning of an observing session and turn your controller on right away. When using FireFly heaters, we recommend a controller setting of about 60 to 80 percent.

If moisture has already condensed on your optics, we recommend covering the optics, turning the heaters on high and waiting 20 to 30 minutes. Once the moisture has cleared, lower your controller setting and resume observing.


Power Requirements

Power Supplies Our dew control systems can only be operated with 12 volts DC. If you are using a battery to run the system, we recommend a 5 amp hour battery as a minimum. If you want to run the system from a wall plug, you will need a 120 volt to 12 volt DC "Regulated" step down power supply with a minimum output of 5 amps.

Pictured to the right are our Regulated 120 volt to 12 volt DC power supplies which are excellent for operating our systems from a wall socket. We also build portable 12 volt power packs and offer other power solutions that can be used with all your astro equipment that is used in the field. See Power Packs for more information on the power systems we offer.

#208-PS25A power supply. How much power do you need? Add up the current draw from all connected equipment and then multiply by at least 2. Generally, you want a power supply that can deliver twice as much power as you think you might need. Otherwise, an overworked PS is going to fail or even get excessively hot.

NEW Big-Honkin 25 Amp Power Supply (110VAC or 220VAC)! Big mounts, cooled CCD Cameras, Dew Heaters use a lot of juice. 25 Amps is enough power to run just about any device you would ever need.

2085 120v 5 amp power supply, converts 120v to 12VDC. 5 amp output IN STOCK CAN $130.00
2078 120v 10 amp Power supply, converts 120v to 12VDC. 10 amp output. IN STOCK CAN $225.00
208-PS25A 110/120VAC to 12 vdc, 25A power supply. North American Plug CAN $329.00
208-PS25A-EU 220/240VAC to 12 vdc, 25A power supply. EU (type "F" Plug) CAN $339.00
208-PS25A-UK 220/240VAC to 12 vdc, 25A power supply. UK (type "G" Plug) CAN $339.00


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