Eureka Effect

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It fixes, it dents craniums, it's the wonder tool of the century!
Eureka Effect publicity blurb

The Eureka Effect is a melee weapon for the Engineer. It is a retro-futuristic pipe wrench with a team-colored handle and an atomic symbol etched into the top of it. A spiral antenna, not unlike a Tesla coil, is attached to the head. A switch near the top of the grip is connected to a red wire that is plugged into the bottom of the antenna.

Using this weapon will cause the Engineer to take twice as much time when upgrading and repairing buildings.

By pressing the reload key, a menu will appear with options on where to teleport to. Choosing either will cause the Engineer to perform a taunt for approximately 2 seconds with the weapon, during which he hoists his wrench into the air and is struck by a bolt of lightning, causing him to be teleported directly to his chosen destination. Choosing the respawn room option gives him full ammunition, health and removes all effects caused by other players in the process and allows him to change his loadout, similar to touching a resupply cabinet. Choosing the Teleporter exit option will instantly move the Engineer to his Teleporter's exit, provided one has been fully built. A Teleporter entrance is not required for this option, and it will not cause the Teleporter system to need to recharge afterwards. Neither destination will leave the usual team-colored particle trails at the player's feet. The taunt cannot be activated if the player is in the air or in water.

Using the Pip-Boy will change the GUI similar to that of the destroy and build GUI's.

The Eureka Effect was later contributed to the Steam Workshop, at Valve's request.

Damage and function times

See also: Damage
Damage and function times
Damage type Melee
Ranged or Melee damage? Melee
Base damage 100% 65
Point blank 55-75
Critical 195
Mini-crit 75-101
Damage repaired per hit 50
Upgrade amount per hit 12
Metal cost per repairing hit 1 + damage / 5
Metal cost for reloading ammo 1 / bullet
2 / rocket salvo
Function times
Attack interval 0.8 s
Values are approximate and determined by community testing.


Item set

Main article: Item sets
Dr. Grordbort's Brainiac Pack
Item icon The Brainiac Pack Bundle.png
Eureka Effect
Eureka Effect

No effect


See also: Crafting


Jag Reclaimed Metal Eureka Effect
Item icon Jag.pngx2 + Item icon Reclaimed Metal.png = Item icon Eureka Effect.png
Class Token - Engineer Slot Token - Melee Scrap Metal Possible Results
Item icon Class Token - Engineer.png + Item icon Slot Token - Melee.png + Item icon Scrap Metal.png =
Item icon Gunslinger.png Item icon Southern Hospitality.png Item icon Jag.png Item icon Eureka Effect.png

As a crafting ingredient

Refined Metal Brainiac Pack weapon Possible Results
Item icon Refined Metal.pngx4 + Item icon Pomson 6000.pngItem icon Eureka Effect.png =
Item icon Brainiac Hairpiece.png Item icon Brainiac Goggles.png
Eureka Effect Reclaimed Metal Rescue Ranger
Item icon Eureka Effect.pngx3 + Item icon Reclaimed Metal.png = Item icon Rescue Ranger.png

Related achievements

Leaderboard class engineer.png Engineer

Built to Last
Built to Last
Help a single building tank over 2000 damage without being destroyed.

Circle the Wagons
Circle the Wagons
Repair 50,000 damage to friendly buildings constructed by other players.

Doc, Stock, and Barrel
Doc, Stock, and Barrel
Repair a sentry gun under fire while being healed by a Medic.

Fistful of Sappers
Fistful of Sappers
Destroy 25 sappers on buildings built by other team members.

Get Along!
Get Along!
Manage to get to, and then remove, a sapper placed on your building while you were several meters away.
Land Grab
Land Grab
Help a teammate construct a building.

Quick Draw
Quick Draw
Kill a Spy and two sappers within 10 seconds.

Rio Grind
Rio Grind
Perform 50 repairs and/or reloads on a Sentry gun being Wrangled by another Engineer.

Silent Pardner
Silent Pardner
Upgrade 50 buildings built by other team members.

The Wrench Connection
The Wrench Connection
Kill a disguised spy with your Wrench.

Update history

December 15, 2011 Patch (Australian Christmas 2011)

  • The Eureka Effect was added to the game.

December 16, 2011 Patch

  • Fixed an exploit with The Eureka Effect where the effects could activate without taunting in high-lag situations.

January 11, 2012 Patch

  • Added crafting blueprint for the Eureka Effect.

March 19, 2013 Patch

  • Fixed the death notice icon for the Eureka Effect.

November 12, 2013 Patch

June 11, 2014 Patch #1

  • Changed attributes:
    • Can now pickup buildings.
    • Repair and upgrade rates have been decreased.
    • Can teleport to your spawn room or your Teleporter Exit.

June 11, 2014 Patch #2

  • Updated the materials for The Eureka Effect HUD to support mat_picmip.

Unused content

  • There are two unused particles. An idle particle designed for the tip of the electrode, and an impact particle.


  • Because the Eureka Effect functions like an instant respawn, it will still replenish metal, ammo, and health in Arena mode and during Sudden Death, remove stored Revenge Crits if the Frontier Justice is equipped, and remove any crit boost status (such as crits during Humiliation) or debuff status (such as Jarate and being marked for death). This only applies if choosing to teleport to spawn, rather than the Teleporter exit.
  • If the player suffers knockback during the taunt, they will teleport before the animation completes.


  • The weapon's teleportation ability bears resemblance to the Instant Teleport, a scrapped secondary weapon which would teleport the Engineer to his Teleporter Exit.
  • The name is derived from the term eureka effect, any sudden unexpected discovery, or the sudden realization of the solution to a problem.
  • This weapon is called the Wrenchmotron 600 on the Dr. Grordbort's website. The Eureka Effect is listed as an "electrifying taunt" there.[1]



  1. Team Fortress 2 Brainiac Pack

See also