i'm not too sure what it's called, often my dad needs to waterproof the floor of a shower so what he does is he gets this waterproof paint and puts on a thick coat, then lays some type of waterproof mesh membrane and another coat of paint. he says that just the paint alone is very effective but that the added mesh makes it unstoppable.
as for heating, i intend to place a waterproof probe inside the tank and have a separate temp controller sitting outside. i think you'd be hard pressed finding a submersible heater to that accuracy but i haven't looked so i really don't know.
good luck!
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