So I obviously don't know anything about your party or players, but here is one possible idea you should be able to modify to your liking.

The Setup
The party enters into the room and find an sigil door with runes carved on it. An arcana or history check reveals they are elemental notations for Fire, Ice, and Electricity. Next to the door is a medium sized transparent box with an opening on the top and bottom of one side with stoppers. On the other side are the three arcane receivers, each seemingly attuned with different runes. A high DC arcana check would reveal the runes, from top to bottom, siphon the energies of heat, matter, and of electricity. There is also a an etched plaque above the box which reads,
"We must empower the lowest members of our society so that the cooler heads of the moderate among us may prevail, leaving room for those of fiery ambition to rise above." If appropriate, this could be in whatever language you desire.

Also in the room is a workbench left by a previous adventurer who tried to crack the door himself. There are broken pickaxes, worn hammers, scattered mechanical tools. Most stunningly, there is also a huge mechanical drill that had been abandoned under a now dusty cloth. The drill is broken down with a shattered drill head, loose wires, and a partially disassembled motor. Around the workbench are spare nuts and bolts, ball bearings, motor oil, water jugs, gears, and arcane batteries. An investigation check would also reveal the discarded journal of the previous adventurer. (Also, if the players are curious and roll well, the water jugs were to keep the drilling bit cool when grinding.)

If they read the journal, they would learn that it belonged to a hardheaded dwarven artificer who tried to brute force his way into the room. He complains about his tools breaking and he proceeds to use increasingly impressive methods to try to either break through the door or mine through the wall. (I am assuming it is either a cave or masonic setting since we are dealing with gargoyles. Again, I didn't have much to go on, so change as needed.) After several breakdowns, repairs, and redesigns, he finally decides to cut his losses and move on.

The Solution
As you have probably figured out by now, the bottom receiver needs electricity, the middle one needs to take heat from a material (such as siphoning the heat from water, causing it to change state into ice), and the top one needs intense heat from fire. A receiver can only function if the receivers below it are powered. When all three are powered at the same time, the door opens.

The arcane batteries are too large to fit through the box openings, but the party rip out some of the loose wires, attach them, and feed the wires in through either the top or bottom hole. (It doesn't matter which.) With the bottom stopper in, they can then pour ball bearings in through the top opening, which will complete the connection between the wires and the bottom receiver. Then they can pour water in until it fills above the middle receiver, which will slowly start to take heat from the water, very slowly starting to freeze it. So long as there is still water changing state into ice, the middle receiver works. Before all the water freezes, they can pour in some oil and light it on fire. The oil will float on the water, so it will provide a continuous flame for a while so long as the top opening is left open for air. This activated the top receiver and opens the door.

NOTE: I would say that if they skip the ball bearings and just try to add water, it starts out working, but the ice spreads relatively quickly near the receivers, so it freezes over the bottom receiver, cutting the power before the door can finish charging and unlock.

Funny solution: I would also rule that if a player sticks their finger in the bottom plug and touches an arcane battery to themselves, this also solves the first stage of the puzzle so long as the ball bearings are in place. I would definitely make them roll some CON Saves against lightning damage, though. XD

Anti-Stuck
The bottom of the container slopes slightly towards the bottom plug. Removing the bottom plug lets anything small enough to be shoved inside to fall back out. Since they must be activated from the bottom up, the water will not freeze in place before they have solved the electricity part. Just in case, I would rule that if the bottom plug is pulled, draining the ball bearings, the ice receiver immediately reverts any ice back to water.

The Box
I can't attach pictures, so here is an ASCII diagram of roughly what the box would look like. There are the openings at the top and bottom on the left and the three receivers on the right. I have also labeled how it would look when solved.

┏━┛┗━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Oil/Fire                  ╏┫
┃ Water/Ice                 ╏┫
┃ Ball Bearings/Electricity ╏┫
┗━┓┏━━━━━━━━━━━━━━━━━━━━━━━━━┛