there are as many opinions on this as there are forum members. but as John mentioned. if you can get a boil you are fine. a lot depends on batch size, type of brew (all grain, extract) which can influence your boil volume. I can do just fine on my gas burner on my stove. however, my wife is not fond of the smell and even without boil over there will be evaporation and condensation around the stove top that can be a sticky pain to clean. I made a cheap small batch electric kettle that i can use anywhere. I would focus on process, especially fermentation if you have the ability to boil your volume already.