Read my Post #28 at:
http://www.pprune.org/tech-log/35628...ake-off-2.html
in the B737 x-wind take-off thread in the Tech Log.
I have first hand experience with tail ice on a Boeing 737 (200 Model). Anyone who thinks or tells you that the tail on that airplane will not ice or that performance isn't affected is NUTS.
There's a real nice heater back in the tail (the APU) that could heat the tail real easy, but it'd cost a few pounds of fuel. It is just another example of cost saving measures that come into play in the manufacture of not only airplanes but many other things.