Hey fellow Heimerdinger players!
My name is Fabian (better known as DoctorDingus) and I like to welcome you to my guide!
I´ve been maining Heimerdinger since s8 and collected over 2k ranked games and over 2 million masterypoints across all my accounts. Last season I managed to be challenger for over 4 months. Also I was Rank 1 World on Heimerdinger on one of my smurfs Since the beginning I´ve always played Heimerdinger on bot and only played him mid when being filled. I personally think his true potential is on the bottom lane.
If you have any further questions after reading through my guide or simply want to see some good gameplay feel free to join my Twitchstream [https://www.twitch.tv/doctorxdingus]
I do stream everyday!

Greetings and much love from a fellow Heimerplayer,
DoctorDingus

Buy yourself Doran's Ring and two Health Potion then walk to lane and instantly place two turrets in the mid-centered bush as shown above in the picture (when blue side place it 1 then 2 - when red side 2 then 1) Turret Number 3 will be placed AFTER pulling buff or when minions are there. Usually you can stand in the bush close to your turret and wait for minions to appear before placing another turret in the middle of the lane to apply pressure and push the wave. If your jungler starts at bot side and needs your help - feel free to help him, since your turrets will fall asleep and won´t attack the minions that are spawning soon. In 7 out of 10 games in high elo, people actually do not check the bush and you get to keep the two turrets AND have 3 turret stacks up when minions arrive lane (keep in mind - this is for maximum pressure and push potential!).
Simply push all waves into turret, poke with your W wether you shoot the rockets through minions that are low hp and enemy champions behind them will be damaged or walk to side of lane (doesn´t matter if left or right side of the minion wave - just get yourself a clear shot) and shoot your W wider spread and not just tunneled. Like this:You´ll lose about 20% of damage by spreading them but have a higher chance of hitting! Best backport in early game would be Lost Chapter if you do not have enough gold at your first backport you can also buy one more Doran's Ring if they have alot of all in or poke and you need the extra hp. Dark Seal is a good item to buy, because of the extra ap+mana. If not just start buying the components of Lost Chapter. Boots I usually never buy before getting Lost Chapter.
Try to finish your Liandry's Torment as fast as you can because that´s Heimerdinger´s first powerspike.
Keep in mind: Since we run Manaflowband if you have manaproblems in lane simply use your W only if Manaflowband is up and you won´t have any more problems!

Once one of the turrets is killed (doesn´t matter if it´s your turret or enemies) you will have to rotate with your supporter. Meaning that if dragon is up (or will be up within next two minutes) you should go mid lane now and your midlaner goes bottom. This way you have the pressure and push potential of your champion sitting in mid and pressuring to kill enemy mid turret, while your midlaner can farm on botlane for free. Ideal situation would be if enemy botlane doesn´t rotate so they are sitting bot (but your midlaner can easily clear wave so there isn´t alot of pressure) and you can 2v1 enemy midlaner and pressure killing the turret or the champion. IF dragon isnt coming up within next two minutes you´ll have to rotate toplane! Sending your toplaner to bottom lane. You apply pressure on enemy top turret, while he tries to hold/save botlane as long as possible.
NOTICE: If you do not have a turret behind you (Tier1 turret)(Tier1=first turret in lane) it´s not ideal to rotate there. Enemies could simply gank you with you being exposed in a very long lane without turretprotection. If dragon is coming up but in midlane there isn´t a turret left on your teamside (maybe just go back to botlane then).
After killing all tier1 turrets it´s ideal for Heimerdinger and his support to stick around midlane as much as possible. Since your champion has a lot of push power and good fighting potential you can easily clear mid wave and then get into fighting in enemy jungle, river etc.
NOTICE: Heimerdinger has high objective pressure (meaning he can fast clear it)
If you get one or more kills in teamfights after the 20 minute mark feel free to do baron! Turrets in baron pit will be placed like this:



If enemies decide to do baron but you are the only one alive or you want to go for a baron steal turrets have to be placed like this (doesn´t matter on which side your are coming from, you WANT to be above baron pit to go for safer baron steal).
Turrets are placed like this to steal:
number 5 would be that you use your W on baron (trying to last hit it). It is important to mention if you can hit enemy jungle or someone in the pit that is low hp angle your ultimate W differently (but do hit baron with it!)
The combo using Ultimate E and W will be thrown at 1k to 2k Baron hp (depending on your damage)!

See in this example!

Ultimate Q can always be used while having someone trying to kill you (for example enemy toplaner such as Renekton, Jax, Irelia etc.).
Ultimate Q can also be used if enemy team is trying to engage on you and you try to block the way or giving them no opportunity to pass your turret and engage.
Ultimate W is rarely used in teamfights (only if a high priority target such as fed midlaner, heal support etc. is stunned/rooted/binded etc. and isn´t able to move for now and you could burst that target down).
Ultimate W is often used in lane when hitting a stun for example and target can be easily bursted.
Ultimate E can be used for stunning 3+ people in teamfights but only if you have follow up damage. If you are the only one in your team that actually deals damage I would´nt recommend using it, because you deal more damage using Ultimate Q or W.
Ultimate E is good for disengaging (enemie team is chasing you and you have a clear shot stunning/slowing them while chasing you).
Ultimate E can also be used to engage or if you have a chance of killing someone important in the backline of the teamfight.

It is important for you to understand how you should use which form of your ultimate. Keep in mind that your ultimate does not have alot of cooldown. So it´s no shame to go for certain plays that do not work out in the end. Just play it slow until your ultimate is back up!
Also try to stay behind your melee champions. But don´t be afraid of someone engaging you! Quickly drop your turret, try to stun the target and instantly have a free kill!