2. Start-up temperature: No more than 25.
3. Start-up time: No longer than 2 minutes under normal sunshine.
4. Low temperature resistance: No breaks at -30.
5. Heat impact resistance: No damage after over 3 time's alternative impact of cold water below 25 and hot water over 90.
6. Pressure resistance: Can withstand 0.6Mpa.
7. Hail resistance: No damage by the impact of 25mm diameter hail.