Brainstorming ideas for coolant crossover on Air-Gap intakes

The electric heater pad. Is there a way to connect it to a rheostat? If so you can regulate how hot you want it to get and fine tune it.

I'm sure I could, it comes literally with just 2 wire leads to connect to whatever you want to power it, and ground (duh). It's super simple, another reason why I'm going for it. They're also pretty dang efficient too, I forget the numbers but with a 12V supply it gets way hotter than I think I'd need it to, depending on the actual amount of heat energy it can put out as the aluminum intake dissipates it away. I'm gonna try it first just full power and see how long it takes to heat the intake and how hot it can actually get with it left on; there may be enough heat transfer going on that it never gets up to full temp.