I used for testing one steam engine with 10 hot water inside (Temperature: 100).
First experiment:
Steam engine converts energy from water to accumulator (10 water *85 J/water = 850J).
Accumulator's energy is used to charge new laser turret, it is enough energy for ~1 turret.
Second experiment:
Steam engine is used to charge turrets directly.
In this case engine can charge ~3.4 turrets.
Initial conditions
Converting energy to accumulator
one charged turret