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Heimerdinger Build Guide by Kar-zid
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If, whilst playing Heim, his mana burning is becoming a bother, mana regen Marks or Seals can replace the AP ones, at the cost of early game power.
The next item is the customary Sorceror's Shoes, the magic pen excellent for cutting through champs.
The Archangels Staff is an insanely good item for all AP casters, and, if very late game you feel you want more AP, you can sell off all other items except for your boots and Rabadon's, and fill up with these, your nuking power will skyrocket.
The Void Staff is a maybe item, useful only if the enemy team begins stacking more magic resist. It can easily be replaced by the Abyssal Scepter, if you're the one needing magic resist, or another Archangels, purely for more AP boost.
Zhonyas Hourglass is a special item, and won't always come in handy for Heim. The AP is great, and the armor increases his survivability immensely, however the active isn't ideal for Heim, he should never be in a position where he'd need it unless he knows he can finish off all the enemies around him.
Getting the H-28G EVOLUTION TURRET to level 3 early is good as well, as then you are able to place two turrets, further increasing your farm and helping out allies.
Your ult, UPGRADE!!! doesn't come in handy very early game, it CAN be used to get a kill early, but it's far more useful during teamfights. Your level 3 Q is more important than this, and should be acquired first.
The CH-1 CONCUSSION GRENADE is amazing, a stun and mass damage, but it's very unreliable and hard to hit. This is the last skill you should max, even though it can come in very handy at all times, but it's slow speed makes it less useful than your other skills early.
Insane laning potential
Crazy damage early game
Squishy when not built correctly
Can be outscaled late game by other AP carries
Heim is an amazing champ to play, if you can play him, and if you can't, then he can end up just being a feed. He can farm well, and thus can outlevel most champions, and can push insanely hard in any lane, but it must be noted that other AP carries can outscale him and put out more damage late game.
Also, his passive allows you to help allies heal faster, and that bit of healing can be the difference between life and death.
His W and E skills can be used through walls, and thus can get surprise harass or kills in.
The turrets you put down can be placed in brush for a little surprise, or placed to keep a minion wave from pushing to your tower while out ganking.