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   ocr: 4) High etticiency is possibie, but at the expense of much greater complesity in the boiler, particularly the boiler controls. It is also difficult to design cost effective boilers which will withstand the high temperatures (for efficiency) and pressures (for smail size) required. 5)Iti is interesting to note that many electric generating powerplants use the steam turbine cycle, which is limited in its efficiency in the same ways as the reciprocating steam engine. However, by using very high temperatures and a more sophisticated steam cycle, they achieve very high erticiencies, on the order of ...