All i see on this forums is people crying about Heimerdinger turrets,
turrets isnt the main problem of that champion, you need 1 person with an area of effect spell to destroy turrets,
the main problem is the concusison grenade, so far its the only spell that can do major damage to tower and worst part of it you can cast it from so far that tower can't even try to target you, so either it's range should be reduced or the damage to building should be remove.
and if it was only about damage to building but that same little grenade have an aoe stun, okay there is some champion with stun, not alot with aoe, but none have a stun that blind enemy and it's getting really bad when you say it's an area of effect spell
so i suggest to remove the blinding effect from grenade, it's not a flash grenade, so it shouldnt blind stun aoe is preet large enough to let you land stun