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.
They can meet the hot water needs of average homes: 50-100 gallons (190 to 380 liters) of hot water per day... Simpler water heaters-thermosyphon and batch/ICS systems for moderate and hot climates-can be a lot cheaper: $1,000 and $3,000...NOTE on solar water heater prices in the US, Israel and China:n the US and Europe expect prices of at least $3,000 - $5,000 for drainback and active solar hot water heaters (systems involving storage tanks, pumps, antifreezing and controls to respond to freezing problems).