Clutch The KTM 250 EXC-F employs the KTM-developed DDS clutch (damped diaphragm steel) with a wear-free steel basket and extremely heat resistant clutch plates and new, nitrated steel liners. This clever design employs a diaphragm spring instead of the usual coil springs, making for considerably easier clutch action.
The difference between active and passive solar water heating systems is that active systems have circulating pumps and controls, while passive systems do not. Although passive systems are usually not as expensive as active systems and can last longer, they are generally less eficient.
The Sun may be used to heat water instead of electricity or gas. There are two basic types of active solar heating systems based on the type of fluid â either liquid or air â that is heated in the solar energy collectors. (The collector is the device in which a fluid is heated by the Sun.).