... about 1200 workers, and 100 advanced production lines for solar water heaters and vacuum tubes, with all the key ... . Our production capacity is: 1 million sets of solar water heater per annum, 15 million pcs vaccum tube ... installation SOLAR KEYMARK got already from TUV for Pressurized solar water heater 175L SUNSHORE SOLAR KEYMARK certificated hot sale compact pressurized solar water heater ...