sure shot suggestions

Fire, Frost, and Arcane. Those are the three Mage specs (specializations) in the World of Warcraft. Frost is usually employed for PvP, Arcana for mounting up big numbers against Bosses in PvE, and Fire for spreading those glorious flames all over the place (and setting up some pretty nice numbers in both PvP and PvE.) Having this basic information at hand, will assure you'll get warm water daily of the season, when you need and however much you will need - on the best cost possible. This will also assist you to decide, if you need to adhere to the traditional water heat you've used or if you'll step out of the box and try a different water furnace.