When I tried Kel'Thuzad 25m as Elemental a couple IDs ago I simply ran OOM in phase 2 at about 55% boss health because of his mana burn. Was pretty easy as Enhacement, though, even with noticeable worse gear, using Feral Spirit and Healing Storm glyphs. Just pay attention to the Void Fissures, they are near to impossible to see with all the enemies around you and still hit pretty hard.

MMO-Champion
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. Anyway take glyph of chain lightning and glyph of thunderstorm. When the adds first spawn use your earth elemental to agro them all and basically chain lightning spam them. Echo of the elements is also pretty useful altho probably not necessary. Anyway chain lightning gives a huge chunk of mana back on those guys that you have plenty of mana to keep healing yourself once your elemental despawns. I also tried to save ancestral guidance till after my elementals gone, this is becus those adds kinda hurt and chain lightning ancestral guidance will keep you alive with a whole lot of mana left. however i completely failed that and ended up using it wen my elemental was still up. Anyway I also prefer to use my ascendance whilst my earth elemental is up and i have full mana becus i dont have to worry about healing and the faster you get the boss down with your elemental up the easier the fight will be