Abilities of Heimerdinger
Spell skill priority is an important winning factor for Heimerdinger. Understanding the abilities of Heimerdinger in League of Legends is another. Below you can find all the relevant information on Heimerdinger abilities. In order for item builds you should check the build for Heimerdinger.
Passive: Hextech Affinity
Gain Move Speed while near allied towers and turrets deployed by Heimerdinger.
H-28 G Evolution Turret
Heimerdinger lays down a rapid-fire cannon turret equipped with a secondary pass-through beam attack (turrets deal half damage to towers).
Heimerdinger constructs a Turret that attacks nearby enemies. Heimerdinger can have maxturrets turrets active at once. Turrets slowly build up charge. At max charge, they fire a stronger attack.
If Heimerdinger gets too far away, his Turrets will deactivate after 8 seconds.
This Ability has maxkits charges.
Hextech Micro-Rockets
Heimerdinger fires long-range rockets that converge on his cursor.
Heimerdinger unleashes a barrage of rockets rockets that deal damage magic damage to the first enemy hit. Additional rocket hits deal reduced damage.
Max Damage: totaldamage magic damage.
Nearby Turrets gain 20% charge per rocket that hits a champion.
CH-2 Electron Storm Grenade
Heimerdinger lobs a grenade at a location, dealing damage to enemy units, as well as stunning anyone directly hit and slowing surrounding units.
Heimerdinger hurls a grenade that deals damage magic damage in an area and Slows by slowpercent.0*100% for slowduration seconds. Enemies in the center are also Stunned for stunduration seconds.
Hitting a champion fully charges nearby Turrets.
UPGRADE!!!
Heimerdinger invents an upgrade, causing his next spell to have increased effects.
Heimerdinger upgrades his next non-ultimate Ability.
H-28Q Apex Turret: Place an upgraded Turret for 8 seconds that doesn't count towards Heimerdinger's max turrets, deals qultdamage magic damage per shot and qultdamagebeam magic damage per charged shot. Its attacks deal damage in an area, Slow by 25% for 2 seconds, and it is immune to crowd control.
Hextech Rocket Swarm: Fires 4 waves of rockets that each deal wultdamage magic damage. Champions and jungle monsters hit by additional rockets take reduced damage, and minions take increased damage. Max Damage: wulttotaldamage magic damage.
CH-3X Lightning Grenade: Throws a bouncing grenade that discharges three times, dealing eultdamage magic damage. The Stun and Slow areas are larger.
Recast: Cancel this Ability.
FAQ on Heimerdinger
What do you max first on Heimerdinger?
Most Heimerdinger pros max out 
H-28 G Evolution Turret first.