Okay here is a simple guide to follow:
Herpstat I (original) - 1 channel - NFS
Although the basic Herpstat controls only one temperature gradient it is equipped with multiple outlets so that you can connect multiple heat sources AS LONG AS THE HEAT SOURCES ARE THE SAME. i.e. you can connect two identical pieces of flexxwatt to a single herpstat. This product is no longer for sale directly from spider co but you can still find it floating around on the market.
Herpstat ND - 1 Chanel -NFS
essentially the same same device as a herpstat I, the Herpstat ND comes with the Night Drop feature to lower the temperature on the same channel during set times in the day. This product has been deemed obsolete thanks to the new line of Herpstat I and II, which feature Night Drop.
Herpstat I basic - 1 channel - $115.00
The herpstat I basic is essentially the same system as the original Herpstat. It is a baisc Herpstat without Night Drop or humidity control. It is a relatively inexpensive and fully functional thermostat with the reliability that Spider Robotics is known for. The new design makes it much more aesthetically pleasing and the fuses are user replaceable, making the 2012 Herpstat I basic much more economical than the original system.
Herpstat I - 1 Channel - $139.00
The 2012 herpstat I is an upgraded version of the original Herpstat. Equipped with Night Drop and humidity control it is more versatile than the original. The Herpstat I has one channel so that you can control a single temperature gradient with the added feature of night time temp drops. It comes grounded which makes it ideal for racks made of conductive materials.
Herpstat II - 2 channels - $195.00
The herpstat II has two channels for controlling two different heat sources at different temperatures. It functions in the same way that two different Herpstat I's would. The Herpstat II features Night Drop to bring the temperatures lower at set points during the day. You can run two separate racks or enclosures from one thermostat safely and efficiently. The 2012 Herpstat II's also have humidity control which is an upgrade from the older counterparts. The 2012 also comes grounded, the original Herpstat II did not..
Herpstat PRO - 4 channels - NFS
Although expensive the Herpstat PRO is great for breeders, and people with large collections. You can run 4 separate racks or enclosures, using different heat sources, from one control system. The herpstat PRO also includes the Night Drop feature. This product is no longer available new from Spider Electronics, but can still be found with some resellers, and of course on the market as used devices..
Herpstat 4 - 4 Channels - $339.00
The Herpstat 4 is essentially the new and improved Herpstat PRO, although outfitted with all the same features as the PRO, it also includes humidity control which makes it great as a vivarium regulator. The Herpstat 4 also features grounded outlets.
So there you have it, most of this information of course can be found on Spider Robotics website http://spyderrobotics.com/index.html. My personal recommendation for people with relatively small collections would be to get the new 2012 herpstat II. For the money, it's a great product and is outfitted with some great new features.
Cheers,
Chris.
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