So many kids in here apparently jesus mother of lol, how many builds have you kids downvoted to hell cause "it didnt say so in the nub script?".

Very hard to discuss the fact that I have mid tower down at lvl 10 90% of my games and with 150 minion kills in my bag.

It is really really silly to vote down something you didnt try.
The fact you say that clarity is useless just because I get alot of mana is silly and VERY nubish. So when you pick clarity you actually depends you late game on that? Clarity is for early game, that means up till lvl 15 before this build really begins mana carry itself. Also clarity is SO often used for your teammates, how can you even say it is useless?
If ya want to stack ap, there is no reason not to pick archangels, since that gives the most AP TADA!!!1?
So ya, go ahead and let deathfire grasp depend on your viability, so great yes, you are really good, and the range is even less than his other abilities, I mean wtf?. Deathfiregrasp is to focus heavy HP champions like mundo, vladimir etc.
2700 hp is quite ok for Heimy and spellvamp is good aswell. This builds give 870 ap so sure, they can think they want to kill me, but most often it doesnt happen!

clarity plus two archangels is just silly...completely wasted summoner skill.

Heim pretty much needs a deathfire's grasp. Your enemies are going to rush you, and you need to be able to nuke them before they can reach you...that means CDR and the active of deathfire. stacking archangels on heim just paints a big target that says "Kill me, it's easy"

Firstly I find it very weird that you can judge me from how other Heimies play around with turrets. I dont care about other Heimies :/

True I rushed through the spells, cause I thought people got an idea of maxing turrets and rockets. Now fixed. Since I have boots and 3 health potions plus my health regen and flash, I never really find myself in need of the grenade before lvl 7.
Anywho. The complete build gives you around 2700 hp, 870 ap, spellvamp and all the mana you will ever need! Rod of ages can be discussed, because HP doesnt match well with spellvamp. Maybe the hourglass or something that counters the opponent.
Since I played 150+ games I do know how the grenade works.
I hardly disagree with the negativity around spellvamp. It makes you both versatile in team fights aswell as en extremely effective pusher.
With spellvamp you never need to go home. You can just keep on walking.
What other champion can benefit from spellvamp from that range, aoe and with absolutely no cast time? I can run past a minion wave and heal me while I flee, not for much, but enough.

A mid heimerdinger has nothing to use grenade shot for, else than stun for flee. Why would you not revolve around turrets? Your turrets are everything.
Well anywho, I will beat the arse out of any heimerdinger who use grenade early game xD jesus christ!

I'm gonna have to downvote this. It seems rushed, not spell checked, and Heimerdinger's that revolve around their turrets are never that good. Utilizing the skill shot is most important, because it can completely annihilate, and there's no emphasis on it at all. Spell vamp isn't that great for Heimerdinger, his cooldowns are pretty slow and his auto-attack is nothing. It'll hardly heal you. His turrets don't proc spell vamp either.