Originally Posted by Lost
I like electric personally but you could use gas and make one of those amazing instant steam/hot water contraptions using a burner, stove pipe and copper coil.
But if you are renting then it probably is an apartment isn't it? Which means no gas... Oh well.
How big are your batches? A 1500w element would definitely suffice for 5 gal batches. It may not be the quickest but it would work.
To follow up: search for "flash boiler" if you can do gas/propane.
Otherwise 120v electric will do it for a 5 gal batch.