The extra flushing power can come from taller toilet tanks that generate more “head pressure” for a faster flush, or “assisted flushing systems” can also be used to make less water flush with more power. So, if you’re looking for a water-saving low-profile toilet, I would look for one that operates with the new “pressure vessel” technology.
Pressure vessel flushing systems store air pressure and water inside a closed vessel located under the toilet tank lid. When this type of toilet is flushed, the compressed air pressure helps deliver the extra flushing power.
Bottom line: Even with a low-profile toilet, with an assisted flushing system you can still get a high-profile flush.
Master contractor/plumber Ed Del Grande is the author of “Ed Del Grande’s House Call.” Visit eddelgrande.com or write firstname.lastname@example.org.