This is a brief historical background on the steam engine and physics from wikipedia:

A steam engine is a heat engine that performs mechanical work using steam as its working fluid.

Using boiling water to produce mechanical motion goes back over 2000 years, but early devices were not practical. The Spanish inventor Jerónimo de Ayanz y Beaumont patented in 1606 the first steam engine.

Steam engines are external combustion engines,^[3] where the working fluid is separate from the combustion products. Non-combustion heat sources such as solar power, nuclear power or geothermal energy may be used. The ideal thermodynamic cycle used to analyze this process is called the Rankine cycle. In the cycle, water is heated and transforms into steam within a boiler operating at a high pressure. When expanded through pistons or turbines, mechanical work is done. The reduced-pressure steam is then condensed and pumped back into the boiler.

What do you think is this something that would be worth it to produce or actually energy efficient?  Feel free to comment.