... Sunrise compact pressurized vacuum tube solar collector Features:1. This system consists of solar vacuum tube, heat pipe, water tank, ... operation, fashionable.7. Well wind, snow and hail resistance.8. 72 hours heat preservation.Working Principle: Compact heat pipe pressure solar water ... . Brand: SUNRISE /OEM.6. Warranty: 5 years for complete system, 15 years for solar vacuum tube.7. MOQ: negotiation.8 ...