It has been a while since I made a thread on elevators, however, it is interesting to know that there are two types of elevators that are being labeled as "eco-friendly" - machine room-less (MRL) traction elevators and holeless hydraulic elevators.
An MRL elevator is a type of traction elevator (driven by ropes and pulleys) where the overhead machinery is removed, resulting in a more space-saving design. A holeless hydraulic elevator is a type of hydrualic elevator with a telescoping piston, requiring less digging underground.
It seems that both types offer the advantage of requiring little or no hydrualic oil compared to traditional holed hydraulic elevators. Still, MRL elevators use 1/3 the energy of hydraulic (both holed and holeless). Holeless hydraulic elevators though are cheaper to purchase.
So, which do you think is a better solution? I personally prefer MRL elevators, especially the KONE EcoSpace. KONE in fact doesn't make any hydraulic elevators anymore. Only two (Otis and ThyssenKrupp) out of the big four manufacturers (Otis, Schindler, ThyssenKrupp, and KONE) still make holed hydraulic elevators. Schindler doesn't make holed hydraulic elevators anymore, however, they still produce holelss hydraulic.