Sweetness!

Though I realized after posting that I can make ice that could carry Phlogiston as a box very easily.

You just need to raise the melting point by 20+ degrees, and then set the bubble up to include the ice.

Done and done; if you can buy the services of a couple of 14th level Grammarists, you could pull this off at level 1; as it is, if you are working alone, you can set up your first 998 ER (Ebb (per) Round) generator at 14th level, in less than a day.

This begs the question: is there any way to boost the temperature of Phlogiston? I kinda want to find some really high ER generators, and I think a boosted temperature Phlogiston would be quite the boost.

Let's see... you would need 100 cubic feet of Sunmetal to match a P/I generator with an S/L generator. That being said...

Unlike a P/I generator, you wouldn't be able to drop an S/L generator of similar rate into a tub of Quicksilver, which is then dropped into a Fast Time sub-space, for a good old 3992 ER. Sure, it takes a pair of 14th level specialists to pull off, but you needed one of them anyway (if you were to do this solo, anyway.)

Seriously, when you adjust for size, a P/I generator is the most efficient, full stop. The next best option, a S/L generator, takes up 50.5 times as much space, and no other generator comes close, except for maybe a Silver generator filled with a nice Arcane Fusion spell, though that doesn't feel legal for some reason... (Arcane Fusion is a 7th level spell that in effect casts 11 spell levels, iirc; it would generate an effective 4 ER, if you take looping into account, which barely seems worth it...)

You know, if you want to be damn sure that all Vampires are gone, you can just connect a P/I generator to a Gold output; you get 9945 feet of Daylight equivalent, at the very least, which is constant.

On a side note, I wonder...

Yep, we can chill an area below absolute Zero by creating a P/I generator attached to a Mercury output.

That... is something that you might want to disallow...