The shower "knob"From my research in the mainstream bathroom products, there are two types of shower knob (not include the hi-tech button system) which are twisted knob and lever knob. They were used in most kind of water systems, the normal plumbing and the tank-type water heating system(in western living, the tank-type water heaters are popular in most house and hotel buisiness).
Let's see the differences.
For the twisted knob, the main different point is how to open the shower. The users must twist by using their wrist in many times, more times, more water. And that will make fatigue to the users wrist if the knob is too hard when connected to the system. Most of the low cost knob made from plastic and always add some elements which make the knob have the friction for the hand. And with this kind of knob, if it was hard to twist, it would make the users hand hurt. But in the normal situation, this twisted knob use less force than the lever knob which I will show you why...
For the lever knob, the way to open the water system is; the user must use the whole arm, begin with their shoulder make the force to move the lever which the users must use more force to open the water system. But the benefit things are; the lever knobs don't hurt the user hand and have more fit to the hand to apply the knob.
From I've seen so far, I noticed that there are no plastic lever knob for the mainstream market. The reason should be the properties of material and the usage. The lever knob have more parts to take the forces than the twisted knob. And those parts should be strong, so the manufacturer decide to make the lever knob to be the metal knob only.
http://www.moen.com/
http://www.amazon.com/dp/B000LDJUQQ/ref=nosim/?tag=dealtime-tools-20&creative=380333&creativeASIN=B000LDJUQQ&linkCode=asn
http://www.amazon.com/dp/B000LEHCDS/ref=nosim/?tag=dealtime-tools-20&creative=380333&creativeASIN=B000LEHCDS&linkCode=asn
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