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.
Active Versus Passive Heaters. When you select a solar water heater for your home, you can choose between an active system (like Bob and Lyleâs), or a passive system. ACTIVE SYSTEMS use a pump to move water through their heating system, and this requires a source of energy (often a solar photovoltaic panel).