Solar vacuum tube length 1.8 or 1.9 good
2.1 of the hot water to be generated, the water temperature to be high, but the versatility of the poor 2.1, maintenance costs to be higher than 1.8 meters,
In order to meet the needs of the market, manufacturers generally increase the length of the heating area
Solar vacuum collector tube, now the national standard of 1.8 meters, versatility is good, that is, convenient maintenance, the length of 2.1 meters
