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I had 30 electric heaters, 50 liters and 30 150 liters, we want to put same number of solar heaters, we can use the tanks have the electric heaters, no preasure , we think a vacuum pipe solar or the economic water heater , we also need water controlers volumne and temperatureWhat is the MOQ?How much time will you take to deliver the goodsKindly send me the complete product catalog with Price list.