... , swimming pool, sub district; 2. Economic cost; 3. High efficiency Solar water heater projectWorking principle:1) Many-tubes-connected makes the ... and take the heat to the water tank;4) In case the temperature of the water tank does not reach the ... steel / aluminum alloy, durable and stability performance, well wind resistance solar vacuum tubea) Size: Φ47x1, 500mm / Φ58x1, 600mm / Φ58x1, 800mm;b ...