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.
What is the difference between a hot water boiler and a water heater? While hot water heaters and hot water boilers both heat water, a hot water heater elevates the temperature of water to 125 degrees and a boiler heats it to boiling, converting water to steam. Boilers are considered superior because they serve as a water heater and heating system in one.