HEX coil stands for Heat EXchanger. Its not required in a HLT, its required for a HERMS setup, but you can also, as some do, use it in JUST a heat exchange tank, that holds less water, and only provides the mash heating. Ultimately I can't answer 100% because I don't know what you're building, if you just want a HLT to heat the water for batch sparging, then no, you don't need one.
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~Phil
Fermenting: 10 gals Phil's Phlavorful Brown Ale, 5 gals pLambic in secondary
Kegged: Best Bitters, Peach Mead
Bottled: Pear Mead
Drinking: All of the above :)
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