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Dew heaters.
I have had a great deal of satisfaction from dew heaters that i have made from nichrome wire and a pulse width modulator, and i must say that these are very inexpensive when compared to commercially available units.
I have just acquired 2 x 120w (yes 12v, 10 amp) units from overseas for less than $20 and 30m of 32g (10 ohm/ foot) nichrome from the USA for about $10.
Th current unit i am using delivers 14 watts off 12 v. This is much easier than fiddling with soldering resistors together.
Feedback welcome
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