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Hi,
I have been building my own Dew Heaters at the moment, also have constructred the control unit. The Heaters themselves are realy easy to build if thay are based on a resistor design or resistance wire. I am using 1 watt resistors as Dick smith have only 1/4 watt otherwise. Check out the projects on this site under Dew heater, fully explained and very very cheap, the resisters are only 18c each. I found you do not have to be exact with the spacing of the resistors.
I found the best method is to wrap a piece of wire around the area you want the heater, this will give you the diameter. Equaly space the resistors as best as possible by sight, make sure you add a few more mill to the wire lenght take in the account of the resistors width . The can use the resistors own leads to attach the next resistor, and can twist them together first before soldering, this way if you are out a bit you can fix it before soldering. All you have to do then is put two leads on each end and give it a blanket, enclose it in fabric by sewing. Add a couple of velcro tabs and there you go. It took me less than 30 minutes to complete one dew heater.
I am still at the testing stage at the moment but I am modifying mine from the original by tweaking the control unit to allow me to have full sepersate control of each individual heaters output.
I'd make you a couple up for cost but not sure on your Dew heater controler specs and what it can handle, and how it handles the wattage supply.
My designs work off a regulated 12V supply and can handle up to 20 amp.
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