Heimerdinger Build Guide by
Not Updated For Current Season
heimerdinger is a soul Ap player, he needs his grenaids to evade damage by stunning the high damage player on the enemy team, when playing him use his W to poke and use his E to stun people when they are in turret range, this allows your turrets to deal crushing damage.
Make sure you stay near your turrets, instead of running place a turret and run around it, they will constantly take damage while not hitting you :P (ensure they aren't super tankey or above half health before you do this)
When placing turrets in mid lane keep 1 on the left and one on the right, also have 1 further up.
This allows his further up turret to do the damage(plus Cs) and the one behind is a backup plan incase of ganks etc,(due to his ult and the sheer fact that it does damage and they are still likely focusing you.
(placing heimerdinger's turrets through the wall allows you to check areas or cut of low health people)
Lastly, it is important to remember that every hit from a heimer turret reduces armour and magic resist, it is key to have turrets focus champions if they get to close, to ensure the turrets and your abilitys do the most damage they can.