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Rather than dealing with the additional sealing problems that a heater inside of your canister could create you would be better off to modify a heater into an inline unit. Think of a CO2 reactor with the heater inside.
I agree.

I have thought about DIY a mini canister w/ heater, but figured it was too much trouble/time/money than I have right now.

Here is a link to a DIY inline heater:
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