Heating: Thermosyphon Heat pipe Evacuated tube pressure solar water heater. Certification CE, SRCC, SOLAR KEYMARK 1.SRCC,Solar Keymark/ En-12975,CE SGS, 2.100000Btu/day based on 1000watt/M2 3.15 years warantee for vacuum tube 4.Leading Man FEATURE:1. Special high quality Insulated material to reduce the heat loss 2. Excellent workmanship to guarantee the decent appearance, change for your request ...